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New fuzzy-interval inequalities in fuzzy-interval fractional calculus by means of fuzzy order relation

  • It is well-known that interval analysis provides tools to deal with data uncertainty. In general, interval analysis is typically used to deal with the models whose data are composed of inaccuracies that may occur from certain kinds of measurements. In interval analysis and fuzzy-interval analysis, the inclusion relation (⊆) and fuzzy order relation () both are two different concepts, respectively. In this article, with the help of fuzzy order relation, we introduce fractional Hermite-Hadamard inequality (HH-inequality) for h-convex fuzzy-interval-valued functions (h-convex-IVFs). Moreover, we also establish a strong relationship between h-convex fuzzy-IVFs and Hermite-Hadamard Fejér inequality (HH-Fejér inequality) via fuzzy Riemann Liouville fractional integral operator. It is also shown that our results include a wide class of new and known inequalities for h-convex fuzz-IVFs and their variant forms as special cases. Nontrivial examples are presented to illustrate the validity of the concept suggested in this review. This paper's techniques and approaches may serve as a springboard for further research in this field.

    Citation: Muhammad Bilal Khan, Pshtiwan Othman Mohammed, Muhammad Aslam Noor, Abdullah M. Alsharif, Khalida Inayat Noor. New fuzzy-interval inequalities in fuzzy-interval fractional calculus by means of fuzzy order relation[J]. AIMS Mathematics, 2021, 6(10): 10964-10988. doi: 10.3934/math.2021637

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  • It is well-known that interval analysis provides tools to deal with data uncertainty. In general, interval analysis is typically used to deal with the models whose data are composed of inaccuracies that may occur from certain kinds of measurements. In interval analysis and fuzzy-interval analysis, the inclusion relation (⊆) and fuzzy order relation () both are two different concepts, respectively. In this article, with the help of fuzzy order relation, we introduce fractional Hermite-Hadamard inequality (HH-inequality) for h-convex fuzzy-interval-valued functions (h-convex-IVFs). Moreover, we also establish a strong relationship between h-convex fuzzy-IVFs and Hermite-Hadamard Fejér inequality (HH-Fejér inequality) via fuzzy Riemann Liouville fractional integral operator. It is also shown that our results include a wide class of new and known inequalities for h-convex fuzz-IVFs and their variant forms as special cases. Nontrivial examples are presented to illustrate the validity of the concept suggested in this review. This paper's techniques and approaches may serve as a springboard for further research in this field.



    Artificial neural networks (ANNs) are a significant technique for artificial intelligence. ANNs have developed applications in a wide range of fields owing to their capacity to refabricate and model nonlinear phenomena. System identification, sequence recognition, process control, sensor data analysis, natural resource management, quantum chemistry, data mining, pattern recognition, medical diagnosis, finance, visualization, machine translation, e-mail spam filtering and social network filtering are just a few examples of its applications based on the input that flows via a network during the learning process, either externally or internally, ANNs are evolutionarily versatile under a variety of conditions. The back propagation helps to reliable back propagation stochastic numerical technique. Backpropagation is a supervised learning method that applies the gradient descent approach to lower the gradient of the error curve and thereby minimize error. Paul Werbos devised the backpropagation method in 1974, which Rumelhart and Parker rediscovered. In feed-forward multilayer neural networks, the backpropagation algorithm is commonly used as a learning method. The Levenberg-Marquardt (LM) backpropagation technique for ANNs is a ground-breaking convergent stability methodology that gives numerical solutions to a large extent of fluid flow issues. Numerous researchers have recently experimented with Newtonian and non-Newtonian fluid systems by using an Levenberg-Marquardt back-propagated ANN (LBM-BN). Ly et al. [1] provided a metaheuristic analysis for the parameters and construction of LBM-BN to forecast the shear capacity of foamed concrete accurately and quickly. Zhao et al. [2] used the LBM-BN method to estimate the defection of reinforced concrete beams. Nguyen et al. [3] used ANN-based LM to improve the reliability of robot placement. The ANN approach was adopted by Ali et al. [4] to estimate the expulsion over a sharp-crested weir, and the training technique is based on LM. Ye and Kim [5] used an LBM-BN in China to evaluate electricity usage in a building. Bharati et al. [6] created a neuro-fuzzy system framework and self-organizing maps for superconductor prediction.

    Nanofluids are usually utilized as coolants in heat transfer devices such as heat exchangers, electronic cooling systems and radiators because of their improved thermal properties. Nanofluids have unique characteristics that could make them fruitful in a variety of heat transfer applications, including pharmaceutical practices, microelectronics and hybrid-powered engines, as well as in engine cooling, heat exchangers, domestic refrigerators, grinding, chillers and boiler flue gas temperature reduction. Numerous studies based on the nanofluid concept have been published in the previous few decades. Choi and Eastman [7] proposed nanoparticle diffusion in a base fluid for engineering disciplines for the first time two decades ago. In an analysis by Uddin et al. [8], in the presence of a stretching and contracting sheet, steady two-dimensional laminar mixed convective boundary slip nanofluid flow arises in a permeable Darcian medium. A Din et al. [9] investigation found that the temperature dispersion, productivity and temperature of the fin's tip are significantly influenced by thermal and thermo-geometric aspects. According to their analysis, the fading exponential fin is more efficient than the expanding exponential fin, and this offers important benefits for mechanical engineering. The results on a magnetohydrodynamics (MHD) nanofluid in a circular permeable material, as presented by Jalili et al. [10], demonstrates that the convection mechanism weakens with an increase in the volume fraction of solid nanoparticles. A stronger and more unified core vortex will result from a substantial rise in the Rayleigh number. Additionally, a favorable Nuave occurs when a magnetic force is applied horizontally. A ferrofluid over a shrinking sheet with effective thermal conductivity was another subject of study by Jalili et al [11]. The results indicate that the magnetic and boundary parameters have a similar effect on velocity as the micro-rotation parameter. By examining natural convection in a cavity equipped with a nanofluid, Geridonmez reported in [12] that the fluid velocity and heat transmission are boosted in the presence of nanoparticles, and that convective heat transfer is decreased in a rectangular cavity. The squeezing nanofluid flow that was developed by the authors of [13,14] investigated the Casson-type hybrid nanofluid with slip and sinusoidal heat conditions. Tawade et al. [15] observed increments in the temperature profile for increasing values of the Brownian motion parameter, and that the energy distribution increases with increment in the value of the thermophoresis parameter. Hamid et al. [16] investigated the fractional-order unsteady natural convective radiating flow of a nanofluid; they observed that the velocity field decreases with enhancing magnetic field effects. A heat and mass transmission study of radiative and chemical reactive effects on an MHD nanofluid over an infinite moving vertical plate was performed by Arulmozh et al. [17]. The behavior of an ionized nano-liquid motion with reference to heat transmission between two parallel discs was studied by Khan et al. [18]. Tuz Zohra et al. [19] explored the MHD bio-nano convective slip stream with Stefan blowing phenomena across a spinning disc, demonstrating that, compared to blowing, suction offers a better medium for enhancing the amount of heat, mass and microbial transmission. Various studies pertaining to nanofluids can be found in [20,21,22,23].

    The activation energy (AE) in a fluid stream is significant in a broad range of industrial applications. Arrhenius proposed the concept of activation energy in 1889. It is the absolute basic minimum of energy required for the organisms to transform the reaction mixture into products. Oil emulsions, geothermal energy, fluid mechanics and chemical engineering all benefit from this phenomenon. Given a Carreau nanofluid with magnetic influence, Irfan et al. [24] applied mass flux theory and Arrhenius activation energy. Waqas et al. [25] proposed a bio-convection flow of a tangent hyperbolic nanofluid over a Riga plate with activation energy, demonstrating that increasing the chances of mixed convection parameters increases the velocity of the tangent hyperbolic fluid. Bhatti and Michaelides [26] also used activation energy to transmit a thermo-bioconvection nanofluid across a Riga plate. The nanofluid and bacteria existing in the base fluid were filled into the Riga plate. The study of modulated heat plus mass fluxes in 3D Eyring-Powell nanofluid nonlinear thermal radiation was done by Muhammad et al. [27]. For preventing boundary-layer separation and reducing submarine friction and pressure drag, a Riga plate has been used. In the presence of electromagnetic fields and gyrotactic microorganisms, slip effects on an MHD nanofluid were explored by Habib et al. [28], who used a mathematical approach. The MHD peristaltic transport of a Sutterby nanofluid with mixed convection and a Hall current was described by Hayat et al. [29]. In contrast to higher activation energies and radiation factors, concentration was seen to increase. Entropy continues to decrease in response to greater diffusion parameters.

    In real-life situations, many complex problems demand an ANN due to their complex structure. Due to their extensive applicability in a wide range of domains, analytical and numerical actions that address computational fluid dynamic problems with a deterministic computing model are garnering increasing interest from technical groups, specifically, mathematicians and physicists. When compared to traditional numerical techniques, artificial intelligence algorithms based on stochastic numerical computing have produced accurate and validated results, inspiring authors to work in this paradigm. Researchers in ANNs have recently accomplished some valuable work, like entropy-generated systems [30], porous fins [31], COVID-19 [32], hydromagnetic Williamson fluid flow [33], carbon nanotubes [34], Emden-Fowler equation [35], second-order singular functional differential models [36], Darcy-Forchheimer models [37], dissipative fluid flow systems [38], mosquito dispersal models [39] and many others [40,41,42,43].

    The authors' main goal of this paper is to exploit the strength of artificial back-propagated neural networks with an LBM-BN algorithm that augment the computing power and level of accuracy of the solver to scrutinize the hydromagnetic velocity slip nanofluid flow (VSN) of a viscous material with nonlinear mixed convection over a stretching and rotating disc. No one has used this technique for the proposed problem. It is a novel approach to solve the problem of intelligent computing technique-based supervised learning for VSN model dynamics by using a modern stochastic solution approach based on the artificial intelligence algorithm. Artificial intelligence-based stochastic solution approaches are a more effective and practical substitute for the implementation of numerous linear and nonlinear mathematical frameworks. These problem-solving methods were developed by using a contemporary computing paradigm to address a system of extremely nonlinear ordinary differential equations (ODEs) that describe the mathematical representations of such fluid problems. The main objectives of this research are as follows:

    (i). Represent the mathematical modeling for hydromagnetic VSN.

    (ii). Explain the solution for designed hydromagnetic VSN via testing, validation and training processes.

    (iii). Examine the reference data samples arbitrarily preferred for testing, training and validation and analyze the approximated solutions of the proposed LBM-BN in comparison with the reference results.

    (iv). Generate datasets through the use of LM, and in training/validation/testing processes, as a target for identifying the approximated solution of the proposed LBM-BN.

    (v). The suggested technique efficiently examines the dynamics of the problem for many scenarios based on the variation of pertinent parameters to depict velocity, concentration and temperature profiles.

    (vi). The LBM-BN validity and verification are based on a thorough examination of accuracy assessments, histograms and regression analysis conducted for the VSN, which are given graphically and numerically in sufficient detail.

    (vii). Examine the various scenarios of the VSN by varying the stretching parameter, magnetic variable, Eckert number, thermal Biot numbers and second-order slip parameters.

    The proposed mathematical model is illustrated in Section II. Section III describes the methodology of the designed LBM-BNs with the interpretation of the result. Section IV discusses the effects of several physical parameters on axial f(ξ), radial f(ξ), thermal θ(ξ), and tangential velocities g(ξ). The current study's conclusion is drawn in Section V.

    Nonlinear mixed convection hydromagnetic slip flow for nanofluid flow is considered. The slip velocity is of second order. The considered fluid is incompressible, electrically conductive and flowing along a stretching and rotating surface. The disk is located at z = 0 and rotating with a frequency Ω about the z axis. At z>0, the heat transfer is taken out matter to thermal radiation, Joule heating, Brownian motion and thermophoresis diffusion are also incorporated in the fluid flow system. Figure 1 is a physical illustration of the model.

    Figure 1.  Problem model.

    The governing flow model is given in [44,45,46,47]. The stimulated magnetic field is ignored because of small values of the following:

    wz+ur+ur=0, (1)
    uzwv2r+uru
    2uz2νfσfρfB20u+g{β1(TT)+β2(TT)2+β3(CC)+β4(CC)4}, (2)
    vzw+vru+uvr=2vz2νfσfρfB20v, (3)
    (Tzw+Tru)=2Tz2κf(ρcp)f+(ρcp)p(ρcp)f{(Tz)2DTT+(Cz.Tz)DB}
    +{(vz)2+(uz)2}μf(ρcp)f+σfB20(ρcp)f(u2+v2)+2Tz216σT33κ(ρcp)f, (4)
    Czw+Cru=2Cz2DB+2Tz2DTTκ2r(CC)(TT)nexp(EακT), (5)
    u=a1r+uzλ1+2uz2λ2,v=Ωr+vzλ3+2vz2λ4,w=0,
    Tzκf=(TwT)h1,CzDB=(CwC)h2atz=0, (6)
    u0,v0,TT,CCwhenz.

    Here, from [46],

    u=rΩf,v=rΩg,w=2hΩf,ϕ=CCCwC,θ=TTTwT,ζ=zh. (7)

    The dimensionless equations are as follows:

    f+R(2fff2+g2Mf)+λθ(1+βtθ)+λNϕ(1+βcϕ)=0, (8)
    g+R(2fg2fgMg)=0, (9)
    1Pr(R+1)θ+2Refθ+Ntθ2+Nbθϕ+MEc(f2+g2)+Ec, (10)
    1Scϕ+fϕ'+{1}over{Sc}left({Nt}over{Nb}right)θκ1ϕ(1+α1θ)nexp(E11+α1θ)=0, (11)
    f(0)=A1+L1f(0)+L2fleft(0right),fleft(0right)=0,
    gleft(0right)=1+{L}rsub{3}gleft(0right)+{L}rsub{4}gleft(0right),
    θ(0)=B1(1θ(0)),ϕ(0)=B2(1ϕ(0)),atz=0, (12)
    f()0,g()0,θ()0,ϕ()0.

    Here,

    R=r2Ωνf,M=σfB20ρfa,λ=gβ1(TwT)rΩ2,N=β3(CwC)β1(TwT),Pr=(ρcp)fνfκf,
    R=16σT33κfκ,Nt=τDT(TwT)Tνf,Ec=(rΩ)2cp(TwT),Nb=τDB(CwC)νf,Sc=νfDB,
    κ1=κ2rΩ,α1=(TwT)T,βt=β2(TwT)β1,βc=β4(CwC)β3,E1=EaκT,A1=a1Ω,
    L1=λ1h,L2=λ2h2,L3=λ3h,L4=λ4h2,B1=h1h2κf,B2=h2hDB,κ=8.61×105eV/K.

    The novel concept of the proposed LBM-BN-based method is applied to examine the steady 3D incompressible hydromagnetic VSN flow for a rotating disc surface with nonlinear mixed convection. Nonlinear PDEs are altered into ODEs through appropriate transformations, and the computational results can be calculated by utilizing the Lobatto IIIA formula in the bvp4c technique in MATLAB software. For boundary-value problems, the Lobatto IIIA approach has been studied to test the stability of attributes. The Lobatto IIIA method is used by many researchers in different fields [48,49,50,51]. This technique is applied for the solution of ODEs and generates a dataset for the LBM-BN. The datasets are attained from Lobatto IIIA based on the variation of influential parameters. Later on, a solution can be approximated through a training, testing and validation procedure in MATLAB by using the nftool module, and a comparison is made between the standard results and those of the LBM-BN. The designed neural network weights are connected with nodes and optimized via hidden layers and activation functions. If the weights are not optimized through a forward pass, then the backward pass is taken into account to tune the values of weights, which provides the best solution for the governing mathematical systems. The procedure for the ANNs is provided in [52,53]. This dataset can be used to assist in the calculation of the approximated solution of the VSN problem in MATLAB. Figure 2 illustrates the ANN for the VSN. Figure 3 illustrates the flowchart for the given problem. Regarding the influence of different parameters of the VSN, the graphs are presented for axial f(ξ), radial f(ξ), thermal θ(ξ), and tangential velocity g(ξ) profiles. Also, Table 1 shows all of the scenarios and cases for variants of the VSN. Table 2 reflects the outcomes of the LBM-BN for all scenarios of the VSN. Table 2 contains the epochs, mean square error (MSE) values, performances, mu parameters, gradients and times for all scenarios related to the VSN. For validation of the performance of the LBM-BN, error histogram (EH) regression analysis was performed and the transition state (TS) and MSE results are analyzed.

    Figure 2.  Neural network of VSN.
    Figure 3.  Flowchart.
    Table 1.  All scenarios and cases for physical quantities of the VSN.
    Scenario Physical Quantities Profile Cases
    Case 1 Case 2 Case 3 Case 4
    1 A1 f(χ) 0.3 0.6 0.9 1.2
    f(χ) 0.3 0.6 0.9 1.2
    2 L2 f(χ) -0.3 -0.6 -0.9 -1.0
    f(χ) -0.3 -0.6 -0.9 -1.0
    3 L4 g(χ) -0.15 -0.3 -0.45 -0.6
    4 M g(χ) 1.0 2.0 3.0 4.0
    5 Ec θ(χ) 0.2 0.4 0.6 0.8
    6 B1 θ(χ) 0.3 0.6 0.9 1.2

     | Show Table
    DownLoad: CSV
    Table 2.  Outcomes of LBM-BN for all scenarios of the VSN.
    Scenario Case MSE Performance Mu
    parameter
    Gradient Epochs Time
    Training Validation Testing
    S-I I 3.83E-10 5.45E-10 4.93E-10 3.83E-10 1.00E-08 9.93E-09 127 2 s
    II 2.81E-10 2.29E-10 3.33E-10 2.81E-10 1.00E-09 9.78E-07 104 1 s
    III 7.39E-10 8.33E-10 8.29E-10 7.40E-09 1.00E-08 9.84E-08 161 2 s
    IV 2.32E-10 2.97E-10 2.44E-10 1.10E-08 1.00E-08 9.93E-08 107 9 s
    S-II I 3.40E-10 4.88E-10 3.69E-10 3.41E-10 1.00E-09 9.84E-08 126 0 s
    II 3.03E-11 3.14E-11 4.44E-11 3.04E-11 1.00E-10 9.79E-08 63 1 s
    III 2.18E-11 2.67E-11 1.94E-11 2.19E-11 1.00E-10 9.93E-08 65 1 s
    IV 2.84E-10 3.42E-10 3.38E-10 2.84E-10 1.00E-09 9.95E-07 84 1 s
    S-III I 3.14E-10 3.96E-10 3.16E-10 3.15E-10 1.00E-09 9.76E-09 133 1 s
    II 3.25E-11 3.74E-11 6.04E-11 3.25E-11 1.00E-10 9.85E-08 76 0 s
    III 4.08E-11 4.75E-11 6.16E-11 4.08E-11 1.00E-10 9.75E-07 56 0 s
    IV 5.57E-11 6.22E-11 7.19E-11 5.57E-11 1.00E-10 9.66E-08 58 0 s
    S-IV I 8.82E-10 9.32E-10 1.78E-09 8.83E-10 1.00E-09 9.97E-08 122 1 s
    II 3.65E-09 4.73E-09 3.86E-09 3.65E-09 1.00E-09 9.86E-08 50 0 s
    III 1.82E-09 4.45E-09 3.02E-09 1.82E-09 1.00E-09 9.76E-08 83 0 s
    IV 1.69E-10 2.25E-10 1.41E-10 1.70E-10 1.00E-09 9.90E-08 148 0 s
    S-V I 4.01E-10 4.19E-10 4.86E-10 4.01E-10 1.00E-09 9.99E-09 151 1 s
    II 5.36E-10 8.74E-10 6.63E-10 5.36E-10 1.00E-09 9.81E-08 126 0 s
    III 7.90E-10 7.35E-10 7.61E-10 7.91E-10 1.00E-09 9.54E-07 107 0 s
    IV 9.13E-10 1.20E-09 9.52E-10 9.14E-10 1.00E-09 9.67E-08 103 0 s
    S-VI I 1.76E-09 1.73E-09 1.66E-09 1.76E-09 1.00E-09 9.92E-07 76 0 s
    II 1.08E-09 1.18E-09 1.26E-09 1.08E-09 1.00E-09 9.86E-08 96 0 s
    III 2.03E-09 2.28E-09 2.13E-09 2.04E-09 1.00E-09 9.93E-09 68 0 s
    IV 2.20E-09 2.54E-09 2.36E-09 2.21E-09 1.00E-09 9.71E-08 193 1 s

     | Show Table
    DownLoad: CSV

    The effects of the VSN model were resolved by using an ANN with back-propagated LM. The reference dataset was generated by applying the Lobatto IIIA procedure using MATLAB software. The numerical solution achieved for the allocation of axial f(ξ), radial f(ξ), thermal θ(ξ), and tangential velocity g(ξ) profiles has been studied and explained through diagrams. All six different scenarios of each have four different cases that are listed in Table 1. The input ranged between 0 and 7, with a step size of 0.07 for each case of the proposed LBM-BN for the VSN model. After the dataset was generated, the 'nftool' command was employed to evaluate the solution for the VSN. The solutions of the LBM-BN for all scenarios of Case IV, in the form of the MSE, curve fitness plot, error histogram, regression and training state, are demonstrated in Figures 48. Figures 48 show the outcomes of the stretching parameter (A1), magnetic variable (M, Eckert number (Ec), thermal Biot numbers (B1), and second-order slip parameters (L2,L4) for the VSN model. Additionally, convergence through MSE curves for training and testing, as well as the gradient, best performance index, time taken, mu and epochs are presented in Table 2 for each scenario of all four cases.

    Figure 4.  MSE representations of Case IV for all scenarios of the LBM-BN VSN.
    Figure 5.  Graphical illustration of transition statistics for Case IV for all scenarios of the LBM-BN VSN.
    Figure 6.  Graphical illustration of fitness representation of Case IV for all scenarios of the LBM-BN VSN.
    Figure 7.  Graphical illustration of EH results for Case IV for all scenarios of the LBM-BN VSN.
    Figure 8.  Graphical illustration of regression analysis results for Case IV for all scenarios of the LBM-BN VSN.

    Figure 4 shows the training, validation and testing MSE curves for Case IV for all six scenarios of the VSN. Figure 4(a) shows the MSE curves for Scenario 1 of Case IV. The MSE curves for the best validation performance were attained at 2.97E-10 with 145 epochs in 9 s. Figure 4(b) shows the MSE curves for Scenario 2 of Case IV. The MSE curves for the best validation performance were attained at 3.42E-10 with 84 epochs in 1 s. Figure 4(c) shows the MSE curves for Scenario 3 of Case IV. The MSE curves for the best validation performance were attained at 6.22E-11 with 58 epochs in 0 s. Figure 4(d) shows the MSE curves for Scenario 4 of Case IV. The MSE curves for the best validation performance were attained at 2.25E-10 with 148 epochs in 0 s. Figure 4(e) shows the MSE curves for Scenario 5 of Case IV. The MSE curves for the best validation performance were attained at 1.20E-09 with 103 epochs in 0 s. Figure 4(f) shows the MSE curves for Scenario 6 of Case IV. The MSE curves for the best validation performance were attained at 2.54E-09 with 193 epochs in 1 s.

    Figure 5 illustrates the TS for Case IV for all six scenarios, which was obtained by using the LBM-BN. The impacts of the axial f(ξ), radial f(ξ), temperature θ(ξ), and tangential velocities g(ξ) on the stretching parameter (A1), magnetic variable (M, Eckert number (Ec), thermal Biot number (B1), and second-order slip parameters (L2,L4) were investigated. The gradient had values of 9.93E-08, 9.95E-08, 9.66E-08, 9.90E-08, 9.67E-08 and 9.71E-08, where the values of the mu parameter were 1.00E-08, 1.00E-09, 1.00E-10, 1.00E-09, 1.00E-09 and 1.00E-09 for the LBM-BN, as shown in the depicted plots. The enhanced networks training and test the enhanced convergence of the results can be obtained for the smallest values of gradient, and Mu provide the best convenience.

    Figures 6(a–f) and 7(a–f) represent the fitness curves and EHs for Case IV in terms of A1, M,L2,L4,B1 and Ec, as obtained by using the LBM-BN for the VSN model. The scrutiny of the EHs reveals that the maximum values depicting the errors were found to be very close to zero, which validates the worth of the solver.

    Figure 8(a–f) reflects the graphical illustration of the regression analysis for Case IV for all scenarios of the LBM-BN VSN. The regression plots show that the solver gave the most optimal solution corresponding to the scenarios in terms of A1, M,L2,L4,B1 and Ecforf(ξ),f(ξ),g(ξ),θ(ξ), as associated with the presented fluid flow system.

    Figure 9 demonstrates the behavior of all physical quantities A1, M,L2,L4,B1 and Ec for f(ξ),f(ξ),g(ξ),θ(ξ). From Figure 9(a, b) it can be perceived that, for a higher value of A1, the flow increases in the radial and axial velocity directions. Substantially, for a larger A1, the stretching rate increases and creates more disturbance in the liquid. Thus, the velocity increases. Figure 9(c, d) shows the effect of L2 for f(ξ),f(ξ). Clearly, we examined that the velocity components f(ξ),f(ξ)decline due to an enrichment in L2.

    Figure 9.  Comparison of numerical reference solutions with those of the LBM-BN according to variation of the influential parameters for f(ξ), f(ξ),g(ξ) and θ(ξ).

    Figure 9(e) depicts the impact of the tangential velocity g(ξ) due to the second-order slip parameter L4. It can be seen that the tangential velocity declines with the increase of second order slip parameter.

    The effects of reducing the influence of the tangential velocity and its relationship with larger values of M are depicted in Figure 9(f). Physically, for larger values of M, the Lorentz force increases, which is a force that is resistant to the motion of producing material elements. Hence, the velocity decreases. Figure 9(g) displays the effect of Ec on temperature. The parameter Ec was used to calculate the effect of self-heating on the dissipation properties of a liquid. At extreme flow rates, the thermal field in a fluidic framework is swamped by the temperature gradients appearing in the framework. Also, the effects of dissipation caused by the internal friction temperature are enhanced with the increase of Ec. Figure 9(h) was sketched to discuss the performance of B1 on temperature function. We can see that θ(ξ) increases with increment in the value of B1.

    Figure 10 shows the graphical representation of absolute error (AE) with the variation of f(ξ), f(ξ),g(ξ) and θ(ξ), which validates the performance of the proposed technique. In Figure 10(a), the AE lies between 10-4 and 10-7 with the increment in A1 for f(ξ), whereas, in Figure 10(b), the AE ranges between 10-4 and 10-6 with the increase in A1 for f(ξ). Figure 10(c, d) illustrates the AE of L2for f(ξ) and f(ξ) in the range of 10-4 to 10-7. Figure 10(e, f) depicts the AE of L4 and M for the tangential velocity g(ξ)in the range of 10-4 to 10-7 and 10-4 to 10-6, respectively. Figure 10(g, h) exhibits the AE in the range of 10-4 to 10-7 for both Ec and B1 for the temperature function θ(ξ).

    Figure 10.  AE representation for the LBM-BN according to variation of the influential parameters for f(ξ), f(ξ), g(ξ) and θ(ξ).

    For the present analysis, the author's main aim was exploitation of the concept of the VSN through the application of an LBM-BN to a stretched rotating disk for the inspection of a second-order velocity slip in the presence of activation energy. The PDEs indicating the VSN were converted into ODEs. The designed approach is efficient and accurate based on the MSEs obtained via the training, testing and validation procedures. Moreover, the convergence and stability of LBM-BN mappings have been validated on the basis of achieved accuracy through the application of regression-based statistical analysis and EHs for the proposed model. Lobatto IIIA was utilized to resolve the ODEs and generate the reference dataset for the LBM-BN. The reference dataset was used to facilitate calculation of the approximated solution of the VSN in MATLAB. The flow consequences on the f(ξ),f(ξ),g(ξ),θ(ξ) profiles were analyzed from the perspectives of different physical quantities, i.e., A1, M,L2,L4,B1 and Ec. The substantial findings taken from this research are as follows:

    ● The axial and radial velocity functions grow as values of A1 increase, but a reverse trend can be seen for L2.

    ● The tangential velocity decreases with increment in L4.

    ● With larger values of M, the tangential velocity increases.

    ● The temperature function is increased with increment in Ec and B1.

    Further, the proposed technique can also be applied to a micropolar nanofluid [54], a Casson nanofluid [55], the waterborne spread and control of diseases [56] and computer epidemic viruses [57]. As a future work direction, the authors will consider other machine learning techniques to study the activation energy of various chemical processes.

    The authors extend their appreciation to the Deputyship for Research & Innovation, Ministry of Education in Saudi Arabia for funding this research work through the project number (IF2/PSAU/2022/01/21873).

    The authors disclosed no conflicts of interest in publishing this paper.

    Nomenclature:
    NN Neural network ANN Artificial neural network
    NF Nanofluid AE(J) Activation energy
    T(K) Temperature u,v,w Velocity component
    C Concentration r,v,z Coordinates system
    T Ambient temperature σf(S/m) Electrical conductivity
    C Ambient concentration ρf(kg/m3) Density
    g(m/s2) Gravitational acceleration B0(Tesla) Strength of magnetic field
    a1 Dimensional or stretching constant N Ratio of concentration to temperature buoyancy force
    DT Thermophoretic diffusion σ Stefan-Boltzman constant
    κr Chemical reaction rate κ Mean absorption coefficient
    DB Brownian diffusion n Fitted rate constant
    Ea Coefficient of activation energy Ω Angular frequency
    κf(Wm1K1) Thermal conductivity Tw Fluid temperature
    h1 Heat transfer coefficients h2 Mass transfer coefficients
    κ Boltzmann constant Cw(M) Fluid concentration
    R Reynolds number M Magnetic variable
    λ Mixed convection variable cp Specific heat
    Pr Prandtl number R Radiation parameter
    Nt Thermophoretic parameter Ec Eckert number
    Nb Brownian motion parameter Sc Schmidt number
    κ1 Chemical reaction parameter α1 Temperature ratio parameter
    βt Nonlinear convection parameters related to temperature βc(M) Nonlinear convection parameters related to concentration
    E1 Activation energy parameter A1 Stretching parameter
    L1,L3 First-order slip parameters L2,L4 Second-order slip parameters
    B1 Thermal Biot numbers B2 Solutal Biot numbers
    LM Levenberg-Marquardt MHD Magnetohydrodynamic
    𝜆1, λ3 First-order slip coefficient for velocity λ2, λ4 Second-order slip coefficient for velocity
    MSE Mean square error TS Transition state
    MHD Magnetohydrodynamics AE Absolute error
    EH Error histogram VSN Second-order velocity slip nanofluid
    LBMBN Levenberg-Marquardt backpropagation artificial neural network AI Artificial intelligence



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