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Convective boundary layer flow of MHD tangent hyperbolic nanofluid over stratified sheet with chemical reaction

  • We investigated the combined impact of convective boundary conditions, thermal conductivity, and magnetohydrodynamic on the flow of a tangent hyperbolic nanofluid across the stratified surface. Furthermore, the ramifications of Brownian motion, thermophoresis, and activation energy were considered. Heat generation, chemical reactions, mixed convection, thermal conductivity, and other elements were considered when analyzing heat transfer phenomena. The governing equations were converted via similarity transformations into non-dimensional ordinary differential equations in order to analyze the system. Using the shooting method, the problem's solution was determined. We showed the mathematical significance of the temperature, concentration profiles, and velocity of each fluid parameter. These profiles were thoroughly described and shown graphically. The findings demonstrated that as the Weissenberg number and magnetic number increased, the fluid velocity profile decreased. Higher heat generation and thermophoresis parameters resulted in an increase in the temperature profile. Higher Brownian motion and Schmidt parameter values resulted in a drop in the concentration profile. Tables were used to discuss the numerical values of skin friction (Cfx), Nusselt number (Nux), and Sherwood number (Shx). For the greater values of Weissenberg number and mixed convection parameters, skin friction numerical values fell while Nusselt numbers rose.

    Citation: Reem K. Alhefthi, Irum Shahzadi, Husna A. Khan, Nargis Khan, M. S. Hashmi, Mustafa Inc. Convective boundary layer flow of MHD tangent hyperbolic nanofluid over stratified sheet with chemical reaction[J]. AIMS Mathematics, 2024, 9(7): 16901-16923. doi: 10.3934/math.2024821

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  • We investigated the combined impact of convective boundary conditions, thermal conductivity, and magnetohydrodynamic on the flow of a tangent hyperbolic nanofluid across the stratified surface. Furthermore, the ramifications of Brownian motion, thermophoresis, and activation energy were considered. Heat generation, chemical reactions, mixed convection, thermal conductivity, and other elements were considered when analyzing heat transfer phenomena. The governing equations were converted via similarity transformations into non-dimensional ordinary differential equations in order to analyze the system. Using the shooting method, the problem's solution was determined. We showed the mathematical significance of the temperature, concentration profiles, and velocity of each fluid parameter. These profiles were thoroughly described and shown graphically. The findings demonstrated that as the Weissenberg number and magnetic number increased, the fluid velocity profile decreased. Higher heat generation and thermophoresis parameters resulted in an increase in the temperature profile. Higher Brownian motion and Schmidt parameter values resulted in a drop in the concentration profile. Tables were used to discuss the numerical values of skin friction (Cfx), Nusselt number (Nux), and Sherwood number (Shx). For the greater values of Weissenberg number and mixed convection parameters, skin friction numerical values fell while Nusselt numbers rose.



    Nomenclature:
    (x,y) Cartesian coordinate system[m] (u,v) Velocity field of fluid [ms1]
    g Gravitational acceleration[ms2] βT Thermal expansion coefficient [K1]
    υ Kinematic viscosity of the fluid [m2s1] T Substantial temperature [K]
    T Temperature inside boundary [K] Cp Specific heat of nanoparticle[Jkg1k1]
    Tf Fluid temperature [K] Cf Fluid concentration [kgm3]
    βC Solutal expansion coefficient [K1] ρf Fluid density [kgm3]
    C Ambient concentration [kgm3] Kr Chemical reaction[mol/L/s]
    βo Magnetic field [kgs2A1] S Heat generation/ absorption[cm1]
    σ Fluid Electrical conductivity [sm1] DT Thermophoresis diffusion coefficient[m2s1]
    Dβ Brownian diffusion coefficient [m2s1] η Dimensionless similarity variable
    ˜n Power index Γ Time dependent material constant
    M Magnetic parameter λ Parameter of mixed convection
    N Thermal buoyancy forces Pr Prandtle number
    Nb Brownian motion parameter Sc Schmidt number
    Nt Thermophoresis parameter We Weissenberg number
    γ reaction parameter Gr Grashof number due to concentration
    Gr Grashof number due to temperature E Activation energy
    δ Temperature difference

    Many technical and industrial processes, including food mixing in the gut, blood and plasma flow, the flow of alloys containing mercury, and the lubrication of corrosive oils and greases from the system, use non-Newtonian fluids. Because of numerous technical and industrial uses, many scholars have been interested in the investigation of boundary layer flow and heat transfer in non-Newtonian fluids. Numerous researchers concentrate on non-Newtonian fluid via stretched sheet as the foundation fluid with suspended nanoparticles. Due to this, there has been a lot of interest in studying the thermo-physical properties of non-Newtonian fluids. One of the crucial fluid models among the non-Newtonian fluid is the tangent hyperbolic model. This model makes highly accurate predictions about the shear thinning phenomena. Additionally, the blood flow is properly characterized by this model. As a result, several constitutive equations of the tangent hyperbolic model are used to describe peristaltic flows.

    A nanofluid is containing nanometer-sized particles and conventional base fluid that enhance the combined heat and mass transformed process. Nanofluids are generally specified when nanoparticles are mixed with some base fluids. Nanofluids play a critical role in industrial development in our daily lives such as: in the fields like electronic, automotive, household refrigerators, hybrid drive motors, microelectronics, loops, solar water heater-fuel cells, nuclear power, etc. The first researcher begin to work in this way was Choi [1]. The investigation showed that the addition of nanofluids has significantly increased thermal conductivity. In this respect, Haddad et al. [2] demonstrated a review on natural convective heat transfer of nano fluids. Kalteh et al. [3] discussed a numerical solution of nanofluids with a triangular heat source filled with water-based nanofluid for steady laminar mixed convection flow. The impact of nanoparticle size was explored by Sun 4] who also looked into whether increasing nanoparticle volume improved heat capacity. Shahsavani et al. [5] investigated the non-Newtonian nanofluid flow heat transfer and pressure drop approximation. Shafiq et al. [6,7,8] worked on an artificial neural network (ANN) to estimate the flow through boundary layer of a nanofluid with convective boundaries. The application of a numerical solution for bioconvective tangent hyperbolic nanofluid flow toward a stretched surface was demonstrated by Shafiq et al. [9,10]. Colak et at. [11] studied the numerical simulation of Darcy-Forchheimer Powell Eyring bioconvective nanofluid flow. Through radiative Riga plate, Shafiq et al. [12] studied the dual stratification on stagnation point Walters' B nanofluid flow.

    Many researches do their work using different models of nanofluids. To integrate the properties of thermophoresis and Brownian motion, researchers use the more feasible two phase nanofluid model of Buongiorno. The impacts of thermophoresis and Brownian motion on mass and heat transfer are investigated using Buongiorno's model. This model can be used to calculate the thermophysical properties of nanofluids. These thermophysical properties contribute to the thermal efficiency of several electronic devices. As a result, this model is a useful tool in many engineering fields. Buongiorno's nanofluid model is well suited to the investigation of fluid flow and heat transfer in the different geometries. Mishra and Kumar [13,14] discussed the effect of viscous dissipation and heat generation/absorption on nanofluid flow using the Buongiorno nanofluid model. Khan et al. [15] used Buongiorno model to investigate the non-linear, mixed convective, boundary-driven, tangent hyperbolic nanofluid flow through a cone.

    Due to numerous practical uses of MHD, which includes MRI (magnetic resonance imaging) for illness diagnosis, surgical operations, canter action generating hypothermia, and magnetic field effects on wound healing, the investigation of MHD flow is a significant phenomenon. Additionally, the impact of a stretched sheet on the magneto hydrodynamic MHD flow has several uses in contemporary metallurgy and chemical industries, such as cooling nuclear reactors and melting metals. As a result, the scientific community gave MHD fluid flows a lot of attention in the literature. Hayat et al. [16,17,18] analyze the third-grade fluid's MHD axisymmetric flow over different geometries with heat transfer. Shafiq et al. [19] study the rates of heat, mass and motile microorganisms transfer in the MHD tangent hyperbolic convective flow. Naseem et al. [20] emphasized the behavioral traits of gyrotactic microorganisms to explain mass and heat transport in Powell-Eyring nanofluids when MHD forces are present. Evaluation of mixed convective and chemically reactive nanofluid flow across elongated oblique surfaces when a magnetic field is present is examined by Gupta et al. [21]. Rasool et al. [22] propose a numerical study of an MHD Williamson nanofluid flow that is kept flowing through a porous medium. Mishra and Kumar [23,24,25] classify the effects of heat generation/absorption and viscous dissipation into several categories while analyzing the MHD flow of nanofluid across stretched surfaces. The repercussions of MHD in a Darcy-Forchheimer nanofluid flow surrounded by a nonlinearly extending surface are investigated by Rasool et al. [26]. The impact of inclined MHD on a Casson axisymmetric convected nanofluid flow driven by Marangoni is investigated by Shafiq et al. [27] The references [28,29,30] list a few significant researches on magneto-hydrodynamics (MHD).

    In a variety of situations, mixed convection heat-transfer rules can be controlled to maintain temperature rise or fall. Due of their erratic reputation throughout a variety of industries, mixed convective flows have long been of primary interest to scientists and engineers. It performs well in many high-power output devices where forced convection alone does not produce the desired outcome. Convection is being employed now, both naturally occurring and artificially. Nuclear reactor technology and various areas of electronic cooling use the mixed convection principle. There are several instances of mixed convective heat transfer in numerous domains e.g., motorized engineering, thermal organization of electronic devices. Mixed convection heat transfer has recently attained exceptional significance. In an incompressible fluid, Mukhopadhyay et al. [31] investigate how velocity slip and thermal slip affect the mixed convection flow and heat transfer. Imtiaz et al.'s [32] mixed convection flow using nanoparticles is the subject of this study, and we aim to introduce more general convective heat and mass conditions. Haq et al. [33] discussed the purpose of framework to set up the modeling and simulation of mixed convection flow along a water-filled sheet that is being heated vertically. The mixed convection flow of fluid along a stretching sheet was investigated mathematically by Manzzur et al. [34]. Hsiao et al. [35] discussed the subject of mass and heat mixed convection over MHD viscoelastic fluid across a stretching sheet with electromagnetic dissipation. We concentrated on the mass and heat transfer in a continuous laminar boundary-layer flow. Waqas et al. [36] studied the MHD mixed convection flow generated by a micropolar fluid. Ali et al. [37] study the nonlinear convective and radiative flow of a tangent hyperbolic micropolar nanofluid over a magnetized stretching sheet.

    Chemically reactive mixes are seen in various circumstances from an industrial perspective, including combustion and chemically designed goods. Seini and Makinde [38] investigate the boundary moved while being affected by radiation and chemical reactions; they found that the boundary layer concentration rose when the reaction rate parameter was raised. According to Sinha [39], examination into the effect of chemical reaction on unsteady free convective flow, enhancing the chemical reaction parameter showed a quicker reaction rate when utilizing a permeable plate and slope temperature. Ali et al. [40,41,42,43] investigate the impact of particles aggregation on the thermal conductivity of nanofluid under chemical reaction by the finite element method. Abbas et al. [44,45] investigate the mixed convective and chemically reactive nanofluid flow with Marangoni convection.

    In the year 1889, Arrhenius presented the concept of activation energy. For particles to perform a chemical reaction, they require the minimum amount of energy needed. Reactants cannot produce products without this energy, which can be either kinetic or potential. There is a wide range of uses for activation energy, such as in food processing, chemical engineering, geothermal engineering, and oil emulsions. Bestman [46] examined the binary convective amalgam flow over a porous medium in the first part of his investigation. On an intermittent radiated flat porous panel, Makinde et al. [47] investigated the activation energy and effects of the nth-order chemical process. Alsaadi et al. [48] looked into the regressive mixed convective flow of a non-Newtonian nanoliquid across an absorbing stretched sheet. Abbas et al. [49,50] examined the melting heat transmission and activation energy of different types of nanofluid flow over a slendering stretching sheet.

    In light of several real-world issues, heat source/sink influences on heat transport gets huge importance. The addition of a heat sink or source may change the amount of heat distributed throughout the domain. Ramesh et al. [51] investigated the consequences of a non-uniform heat source or sink on mixed convective flow across an inclined stretched surface embedded in an incompressible fluid. Hsiao [52] analyzed the non-uniform heat source/sink with viscoelastic fluid flow throughout a stretching sheet. The fluid flow caused by an asymmetrical heat source/sink has been the subject of numerous studies. The synergistic impact of non-uniform heat source/sink and viscous dissipation on MHD fluid flow was examined by Ramandevi [53]. The influence of a heat source on the Marangoni convective flow of an incompressible hybrid nanofluid with dust particle deferment across a sheet was investigated by Abbas et al. [54].

    The literature review cited above reveals that there has been no study on mixed convective boundary layer MHD tangent hyperbolic nanofluid flow over stratified sheet. The current research fills this gap by analyzing the tangent hyperbolic nanofluid flow through a stratified sheet with chemical reaction and activation energy. The novelty of our work is exploring chemical reactions and mixed convection in a MHD tangent hyperbolic nanofluid flow with a Buongiorno nanofluid model, thermal conductivity, activation energy, and heat source. Mixed convection in tangent hyperbolic nano fluid has numerous practical applications in industries where heat transfer is essential. The one application is when heat sinks or heat spreaders are affixed to electronic devices that are attached on a surface to aid in heat transfer. The purpose of the model is to move the nanofluid around the heat-producing elements. The governing PDEs are transformed into dimensionless form utilizing the appropriate similarity transformations. The nonlinear system of ODEs is solved by using the Shooting method (Bilal and Ashbar [55]; Muhammad et al. [56]; Rasheed et al. [57]; Khan et al. [15]). The shooting technique can be computationally efficient, especially when compared to other numerical methods like finite difference or finite element methods. It can handle complex geometries and boundary conditions without excessive computational overhead. It is essential for researching fluid dynamics phenomena in a variety of fields and applications due to its precision and flexibility. The consequences of different physical parameters on the velocity profile, temperature profile, and concentration profile have been discussed by graphs and tables. Tables 1–3 are also used to describe and exhibit the skin friction coefficient, Nusselt, and Sherwood number. The subsequent information revealed our work's distinctiveness even more:

    Table 1.  Numerical values of Rex12cfx (skin friction coefficient) for various physical parameters.
    n We Pr λ S Sc Nt Nb -Rex12cfx
    0.2 0.2 1 0.1 0.1 1.5 1.5 0.3 0.83205
    0.4 0.70102
    0.7 0.32142
    0.2 0.1 1 0.1 0.1 1.5 1.5 0.3 0.83637
    0.2 0.83205
    0.5 0.81856
    0.2 0.2 2 0.1 0.1 1.5 1.5 0.3 0.83205
    3 0.73059
    4 0.36811
    0.2 0.2 1 0.1 0.1 1.5 1.5 0.3 0.83205
    0.2 0.80621
    0.5 0.73355
    0.2 0.2 1 0.1 0.1 1.5 1.5 0.3 0.83205
    0.2 0.82862
    0.5 0.81546
    0.2 0.2 1 0.1 0.1     0.8 1.5 0.3 0.82836
    1.0 0.82984
    1.5 0.83205
    0.2 0.2 1 0.1 0.1 1.5 1.5 0.3 0.83205
    0.5 0.82551
    0.8 0.81915
    0.2 0.2 1 0.1 0.1 1.5 1.5 0.3 0.83205
    0.5 0.82907
    0.8 0.82569

     | Show Table
    DownLoad: CSV
    Table 2.  Numerical values of local Nusselt number Rex12 Nux for some physical parameters.
    E Pr λ M γ S Nt Nb -Rex12Nux
    0.1 1 0.1 0.3 1.5 0.1 0.3 0.3 0.24785
    0.2        0.24781
    0.3        0.24771
    0.2 2 0.1 0.3 1.5 0.1 0.3 0.3 0.26525
    3 0.27146
    4 0.28601
    0.2 1 0.1 0.3 1.5 0.1 0.3 0.3 0.26525
    0.2 0.26666
    0.5 0.27009
    0.2 1 0.1 0.1 1.5 0.1 0.3 0.3 0.20518
    0.3 0.26525
    0.5 0.30116
    0.2 1 0.1 0.3 0.8 0.1 0.3 0.3 0.21942
    1.0 0.23600
    1.5 0.26525
    0.2 1 0.1 0.3 1.5 0.1 0.3 0.3 0.26525
    0.2 0.23848
    0.3 0.18583
    0.2 1 0.1 0.3 1.5 0.1 0.4 0.3 0.26525
    0.5 0.31532
    0.6 0.38889
    0.2 1 0.1 0.3 1.5 0.1 0.3 0.4 0.26525
    0.5 0.26531
    0.6 0.26541

     | Show Table
    DownLoad: CSV
    Table 3.  Numerical values of Sherwood number Rex12Shxfor some physical parameters.
    E Pr λ M γ S Nt Nb -Rex12Shx
    0.1 1 0.1 0.3 1.5 0.1 0.3 0.3 0.16522
    0.2        0.16532
    0.3        0.16532
    0.2 2 0.1 0.3 1.5 0.1 0.3 0.3 0.26525
    3 0.27146
    4 0.28601
    0.2 1 0.1 0.3 1.5 0.1 0.3 0.3 0.26525
    0.2 0.26666
    0.5 0.27009
    0.2 1 0.1 0.1 1.5 0.1 0.3 0.3 0.20518
    0.3 0.26525
    0.5 0.30116
    0.2 1 0.1 0.3 0.8 0.1 0.3 0.3 0.21942
    1.0 0.23600
    1.5 0.26525
    0.2 1 0.1 0.3 1.5 0.1 0.3 0.3 0.26525
    0.2 0.23848
    0.3 0.18583
    0.2 1 0.1 0.3 1.5 0.1 0.4 0.3 0.26525
    0.5 0.31532
    0.6 0.38889
    0.2 1 0.1 0.3 1.5 0.1 0.3 0.4 0.26525
    0.5 0.26531
    0.6 0.26541

     | Show Table
    DownLoad: CSV

    ❖ Analyze the behavior of MHD tangent hyperbolic nanofluid flow over a stratified sheet.

    ❖ In this study, we examine the heat transfer characteristics and two-dimensional tangent hyperbolic nanofluid flow that develop using a convective boundary.

    ❖ The analysis is carried out while chemical reactions and heat generation/absorption are occurring.

    ❖ Convective boundary conditions are applied to transfer mass and heat.

    ❖ Temperature and concentration are the linear functions of diffusivity and thermal conductivity coefficients.

    We intend to make theoretical determinations.

    ❖ Does the coefficient of diffusivity and thermal conductivity affect the flow phenomenon?

    ❖ What effect does the envisioned tangent hyperbolic nanofluid flow have on the magnetic field?

    ❖ What influence does the thermal buoyancy parameter have on the velocity profile when nanoparticles are present?

    ❖ What impact does the Brownian motion and Thermophoresis parameter have on the concentration profile in the presence of nanoparticles?

    ❖ What impact does the heat absorption and chemical reaction have on the thermal and concentration profiles?

    We investigated the non-Newtonian mixed convection boundary layer hyperbolic tangent nanofluid fluid flow by the stratified sheet that is stable, incompressible, and axisymmetric. The flow is at rest across the surface in the early stages. Whenx is taken along the wall, the flow is restricted in the domain at y=0, which is in the normal direction to the surface. As shown in Figure 1, a persistent magnetic field is applied in the y-direction. The stratified sheet velocity is assumed to be uw(x)=ax where 'a' a positive constant. Effects on heat generation and absorption are also taken into account. The boundary conditions for mass and heat convection are used for a stratified sheet.

    Figure 1.  Physical geometry of flow.

    The following are the boundary layer equations that regulate the current problem:

    Conservation equation of mass (Jawad et al. [58])

    ux+vy=0. (1)

    Conservation equation of momentum (Khan et al. [15]):

    uux+vuy=υ(1˜n)2uy2+2Γυ˜nuy2uy2σβ20uρ+gβT(TT)+gβC(CC). (2)

    Energy equation (Khan et al. [15]):

    uTx+vTy=kρcp2Ty2+τ[Dβ(cyTy)+DTT(Ty)2]+Qρcp(TT). (3)

    Concentration equation (Jawad et al. [58])

    ucx+vcy=Dβ2cy2+DTT2Ty2K2r(CC)(TT)nexp(EaKT). (4)

    Having boundary conditions (Khan et al. [15])

    u=uw(x)=ax,v=0,kTy=h1(TfT),Dβcy+DTTTy=0  at  y=0,
    u0,TT,CC  as  y. (5)

    Appropriate transformations for given problem are defined by (Jawad et al. [58])

    u=xaf(η),v=aνf(η),η=yaυ,θ(η)=TTTfT,ϕ(η)=CCCfC. (6)

    The velocity components in the x - and y-directions are represented by u and v in preceding formulas, Where ν=(μ/ρ) (kinematic viscosity), ˜n (power law index), Γ Williamson parameter), g (gravitational acceleration), βT (thermal expansion), βC (concentration expansion), ρ (density), Cρ (specific heat), k (thermal conductivity), Dβ (Brownian diffusion coefficient), DT (Thermophoresis diffusion coefficient), Q (heat generation/absorption), In the third term of Eq (4) represent the Arrhenius formula in which K2r(rate of reaction), m(dimensionless fitted rate constant), Ea(activation energy) which lies in the range (1<n<1) Ramesh et al. [59]. uw(x)=ax is the linear stratified sheet velocity. The fluid temperature and concentration are denoted by T and C, while the convective fluid temperature and concentration are denoted byTfandCf. The above transformations in Eq (6) are applied to Eqs (2)–(4), and the transformed ordinary differential equations are given as below:

    (1˜n)f(f)2+ff+˜nWeffMf+λ(θ+Nϕ)=0. (7)
    θ+Pr(fθ+Nbϕθ+Ntθ'2+Sθ)=0. (8)
    ϕ+Scfϕ+NtNbθScγ(1+δθ)nexp(E1+δθ)ϕ=0. (9)

    The boundary conditions are as follows:

    f(η)=0,f(η)=1,θ(0)=α(1θ(0)),ϕ(0)=β(1ϕ(0))  at η=0,
    θ(η)=0,ϕ(η)=0  as η, (10)

    where ˜n is (Power law index) We is (Weissenberg number), λ is (mixed convection), N (ratio of concentration to thermal buoyancy forces), Pr (Prandtle number), Nb (Brownian motion parameter), Nt (Thermophoresis parameter), (heat generation/absorption)S, (Schmidt number)Sc, (reaction rate)γ, (temperature difference) δ, (activation energy) E, Biot numbers α and β, Gr (Grashof number) due to temperature and Gr (Grashof number) due to concentration. The temperature at a substantial distance from the wall is shown by T.

    These parameters are specified as follows:

    We=2a3xГν,λ=GrRe2x,N=GrGr=βc(cfc)βT(TfT),Pr=μcpk,Gr=gβT(TfT)x3ν2,Gr=gβc(CfC)x3ν2,S=Q0aρcp,Sc=νDB,Nb=τDB(CfC)ν,Nt=τDT(TfT)νT,γ=K2ra,δ=TfTT,E=EaKT. (11)

    After using the scaling variables, local skin friction coefficient Cfx, Nusselt number Nux and Sherwood number Shx transform into

    R1/2exCfx=2(1˜n)f(0)˜nWef''3(0),NuxR1/2ex=θ(0),Shx=ϕ(0), (12)

    where Rex=Uw(x)ν is local Reynolds number.

    The shooting approach is used to find the solution of the modeled equations. As displayed graphically in Figures 211, the following section shows the graphical effects of several dimensionless factors on the concentration, temperature, and velocity profiles. Numerous dimensionless parameters ˜n,We,M,λ,N,Pr,Nb,Nt,S,Sc,γ,δ,E,and naffect the velocity, temperature, and concentration distributions. The effective parameter range of values has been chosen by following Khan et al. [15], Hayat et al. [60], and Jawad et al. [58], i.e., 0.1˜n0.6,0.1We1.5,0.1M1.5,0.1λ0.9, 0.1N1.5,1.0Pr4.0,0.1Nb0.8, 0.1Nt0.8,0.1S0.7,0.0Sc0.6, 0.0γ0.6,0.1δ0.9,0.2E4.0,0.1n3.0.

    Figure 2.  (a) Impact of ˜n on f(η), (b) impact of We on f(η).
    Figure 3.  (a) Impact of M on f(η), and (b) impactof λ on f(η).
    Figure 4.  (a) Impact of N on f'(ξ), and (b) Influence of Pr on θ(ξ).
    Figure 5.  (a) Influence of Nb on θ(ξ), (b) Influence of Nt on θ(ξ).
    Figure 6.  (a) Influence of S on θ(ξ), (b) Influence of Sc on ϕ(ξ).
    Figure 7.  (a) Influence of γ on ϕ(ξ), and (b) influence of Nt on ϕ(ξ).
    Figure 8.  (a) Influence of Nb on ϕ(ξ), and (b) influence of δ on ϕ(ξ).
    Figure 9.  (a) Influence of E on ϕ(ξ), and (b) influence of n on ϕ(ξ).
    Figure 10.  (a) Streamlines when M=0.3, and (b) streamlines when M=3.34.
    Figure 11.  (a) Isothermal graph when Pr=0.3, and (b) isothermal graph when Pr=0.6.

    a) Velocity profile

    The impact of ˜n power law index on f(η)velocity is seen in Figure 2(a). It is unambiguous that raising the index power law ˜n lowers the velocity profile. The results show that the fluid nature evolves from shear thinning to shear thickening when power law index ˜n grows. Figure 2(b) shows the effect of We on f(η). It has been perceived that f(η) decreases as the Weissenberg number increases. We Weissenberg number directly correlates with relaxation time i.e., when Weissenberg We is higher, more resistance is provided and relaxation time rises. Figure 3(a) exhibits impact of M magnetic parameter on the velocity profile. As the magnetic parameter M and the Lorentz force are related, for big magnetic parameter M values, the Lorentz force grows stronger and offers significant resistance to motion, causing the velocity profile to fall. Figure 3(b) shows the impact of λ on the velocity profile. The buoyancy forces are directly related to the mixed convection parameterλ. As a result, the flow's axial velocity changes in response to changes in the mixed convection parameter. Thus, according to theory, a change in the mixed convection leads to an improvement in velocity field. Figure 4(a) depicts the special effects of N on the velocity profile for keeping other parameters fixed. It shows that when the value of N increases it improves the velocityf(η).

    b) Temperature profile

    Figure 4(b) elaborates on the temperature profile variations in relation to Prandtl number Pr. Since thermal conductivity reduces with increasing Prandtl numbers, the temperatures fall down. According to Figure 5(a), the temperature profile θ(η) exhibits an identical pattern when compared to the Brownian motion parameter Nb. Intensification in the Nb Brownian motion parameter causes random motion to move more quickly, which raises the temperature. The consequence of the Nt on temperature is seen in Figure 5(b). It has been demonstrated that the temperature profile raises for high thermophoresis parameter Nt values. A rise in temperature parameter Nt causes the fluid to go from a hot to cold climate. The temperature profile is influenced by the heat generation parameter S, as illustrated in Figure 6(a). The temperature of the flow field is a decreasing function, while its thermal boundary thickness is a rising function of S.

    c) Concentration profile

    Figure 6(b) demonstrates the implications of Schmidt number Sc on concentration. It shows the diffusivity of hydrodynamics divided by mass is the Schmidt number. Furthermore, Sccharacterizes the concentration layer's relative thickness to the momentum layer. Mass diffusivity is reduced for a largerSc. Hence, the concentration profile is significantly modified by the presence of Sc in the concentration equation. The graph shows that when Sc values are intensified, the concentration profile decreases. Figure 7(a) shows that when γ increases, the species concentration in the boundary layer decreases, although neither fluid temperature nor speed are affected by an increase in the chemical reaction parameter γ. The reason for this is the chemical reaction occurring within this system. The main finding is that the extra energy is typically mitigated by the first-order chemical reaction. Thermophoresis can also affect heat transfer processes in the fluid, which can indirectly impact concentration profiles by altering temperature gradients and fluid flow patterns. The thermophoresis parameter influences the strength of the thermophoretic force acting on particles, which can affect their motion and distribution within the fluid. A higher thermophoresis parameter typically implies a stronger thermophoretic force, which improve the thermophoresis parameter Nt and causes the concentration to rise as shown in Figure 7(b). Figure 8(a) illustrates how the concentration distribution changes when the Brownian motion parameter Nb values change. Increased Brownian movements lead to uneven nanoparticle motion, which eventually lowers the concentration of such particles. The Brownian motion parameter directly influences the rate at which particles disperse within the fluid. Higher diffusion coefficients lead to faster spreading of particles away from their initial positions. The influence of the temperature differential parameter δ on the concentration profile is analyzed in Figure 8(b). We determine that the relationship between δ and concentration is inversely proportional. According to the graph, concentration boundary layer thickness condenses when surface and ambient temperatures differ significantly. The effect of the dimensionless activation energy E on the concentration profile is seen in Figure 9(a). The amount of energy required to excite atoms or molecules for a chemical reaction is generally referred to as energy activation. In a chemical process, a significant proportion of atoms should have activation energies that are either less than or equal to translating energy. For rising values of the parameter E, we find that the concentration profile and saline layer thickness increase. We investigate how a higher value for the activation energy parameter E results in a higher term exp (EaKT), which varies the concentration profile. For various values of the fitted rate constant n, the concentration dissemination performance is labeled in Figure 9(b). For higher values of n, we find that the component γ(1+δθ)nexp(E1+δθ) rises. This component escalates the fluid concentration by destroying the chemical reaction.

    The streamline pattern is seen in Figures 10(a) and 10(b). by changing magnetic parameter. The streamlines are more curved near the surface for a less M and less curved near the surface for a higherM.The graphs of isothermal are shown in Figures 11(a) and 11(b). By increasing the values of Prandtl number Pr, the isotherm decreases and rises for lower values of Pr. To investigate the impact of different physical characteristics on coefficient of skin friction, Table 1 has been created. It has been determined that the skin friction coefficient decreases for larger values of the power-law index ˜n, Weissenberg numberWe, mixed convection parameterλ, heat generation parameter S, and Prandtl number Pr, Thermophoresis parameter Nt, and Brownian motion parameter Nb, but increases with the values of the Schmidt number Sc. Table 2 shows the numerical values of the Nusselt number for various physical factors. It is noticed that at larger values of mixed convection parameterλ, Prandtl numberPr, Thermophoresis parameterNt, and Brownian motion, parameter Nb, the local Nusselt number rises, while it falls down for larger values of heat generation parameterS and power-law index˜n. The influence of different physical parameters on Sherwood number has been shown numerically by Table 3. Comparison of Nusselt number and Sherwood number by varying activation energy parameters from this study with previously published research [58] is shown in Table 4. Both results are in strong compliance with one another.

    Table 4.  Numerical Comparison of Rex12 Nux and Rex12Shx for some physical parameters.
    Nusselt number Sherwood number
    E Jawad et al. [58] Present outcomes Jawad et al. [58] Present outcomes
    0.1 0.2478 0.24781 0.1652 0.16522
    0.2 0.2478 0.24772 0.1652 0.16532
    0.3 0.2477 0.24761 0.1652 0.16532

     | Show Table
    DownLoad: CSV

    The nonlinear associated ordinary differential Eqs (7)–(9) along with the given boundary conditions as stated in Eq (10) are numerically solved with the aid of the shooting technique and MATLAB's integrated Bvp4c solver computational tool. This numerical solution is aided by first reducing the higher-order system of equations to a system of first-order differential equations. By substituting the following values, the resulting higher order constraint has been made first order. Let us make an assumption

    f=f1,f=f2,f=f3,f=f3,θ=f4,θ=f5,θ=f5,ϕ=f6,ϕ'=f7,ϕ=f7,f1=f2,f2=f3, (13)
    f3=1(1˜n)[f22f1f3˜nWef3+Mf2λ(f4+Nf6)], (14)
    f4=f5, (15)
    f5=Pr[f1f5+Nbf5f7+Ntf25+δf4], (16)
    f6=f7, (17)
    f7=Scf6Scf1f7NtNbf5. (18)

    Boundary conditions

    f1(0)=0,f2(η)=1,f5(0)=α(1f4(0)),f7(0)=β(1f6(0))=0,f4()=0,f6()=0. (19)

    We discuss and examine the mixed convection tangent hyperbolic Nano fluid in a stratified sheet. The governing equations are transformed from PDEs to ODEs while the shooting technique is used. The consequence of dimensionless parameters on velocity, temperature, and concentration profiles is assessed using graphs and tables. The conclusions are as follows:

    ❖ In tangent hyperbolic nanofluid flow where heat transfer and temperature gradients are present, thermal conductivity and diffusivity coefficients play a crucial role in comprehending and forecasting flow events. Changes in these coefficients can have a major effect on the fluid's thermal behaviour, heat transfer rates, and flow dynamics.

    ❖ When we increase the magnetic parameter(M), Power law index(˜n) and Weissenberg number (We) tangent hyperbolic nanofluid flow velocity field declines.

    ❖ Increment in mixed convection (λ)and thermal buoyancy parameter(N), velocity profile f(η) enhancing.

    ❖ The tangent hyperbolic fluid temperature falls when the Prandtl number (Pr).

    ❖ The fluid temperature field is improved by increasing the Brownian motion (Nb), thermophoresis (Nt) and heat generation absorption (S) parameter.

    ❖ With higher values of the Schmidt (Sc), Brownian motion (Nb), and chemical reaction (γ) parameters, the concentration profile is minimal.

    ❖ An increase in the value of thermophoresis(Nt), temperature difference δ, Energy activation Eand rate, the constant n parameter concentration profile also increases.

    Reem K. Alhefthi: resources, validation, funding acquisition. Irum Shahzadi: writing-original draft, methodology, formal analysis. Husna A. Khan: writing-original draft, software. Nargis Khan: writing-review and editing, formal analysis, conceptualization. M. S. Hashmi: resources, methodology, software. Mustafa Inc: writing-review and editing, supervision. All authors have read and approved the final version of the manuscript for publication.

    The authors declare they have not used Artificial Intelligence (AI) tools in the creation of this article.

    This research was supported by the Researchers Supporting Project Number (RSPD2024R802), King Saud University, Riyadh, Saudi Arabia.

    The authors declare no conflicts of interest.



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