## Abstract

The aim of the current article is to demonstrate heat transfer characteristics of Williamson nanofluid flow through a stretching surface with a porous medium in two lateral directions. Heat generation, nonlinear thermal radiation, viscous dissipation, Joule heating, and chemical reaction are also considered in time-independent boundary layer equations of heat and concentration. One more significant boundary condition is the melting condition which is introduced in this study for the purpose of more heat generation and suitable transformations by the satisfied continuity equation are selected, These are used to translate the coupled time-independent partial differential equations into a coupled nonlinear system of ordinary differential equations. The translated equations are computed as numerical solutions by utilizing the Runge–Kutta–Fehlberg (R–K–F) fourth-order algorithm with the help of a shooting procedure in matlab (bvp4) programming. The significance of physical emerging nondimensional parameters is predicted through graphs and discussed numerically in detail on mass of conservation, temperature, and concentration. The numerical values of the coefficient of the skin friction are displayed through a table with large enhanced values of nondimensional parameters and heat transfer rate explained in detail through graphs.

## Introduction

Nowadays, most of the research (in fluid dynamic) have been interested or attracted by the heat transfer on non-Newtonian fluid flow through a linear stretching surface with a porous medium, because of outstanding different applications in mechanical engineering (like the flow of plasma, the flow of mercury amalgams and lubrications with heavy oils and greases), scientific fields (food mixing and chime movement in the intestine, groves of fruit trees and crops damage via freezing, and manufacturing of ceramics), industrial processes (hydrometallurgical industry, annealing, fiber technology, drawing, extrusion of a polymer sheet from a dye or electronic chips), and manufacturing processes (manufacturing of ceramics, paper production, cooling of elastic sheets, tinning of copper wire) see Refs. [1,2]. Based on these applications, many scientists are focused on non-Newtonian fluid flow and heat exchange. Non-Newtonian fluids is property of viscosity fluid groups such as anisotropic fluids, polar fluids, and viscoelastic fluids. Of these fluids, Williamson fluid is a viscoelastic fluid. It has been tested experimentally [1,3]. Bilal et al. [2] found to be decreasing in both x- and y-directions for large values of both nonlinearity parameter and Williamson parameter. Malik et al. [4] explored the three-dimensional (3D) flow of pseudoplastic fluid over a linearly stretching surface. The Williamson viscoelastic model was employed by Amanulla et al. [5]. It is a representative of certain industrial polymers. It is solved using the second-order accurate implicit Keller box finite difference method. Moatimid and Hassan [6] analyzed the Routh–Hurwitz theory for dispersion relation. The linear stability of the viscoelastic nanofluid is described through Walter’s model. Khan et al. [7] described the effect of thermal radiation on nanofluid Williamson nanofluid flow via unsteady stretching surface. This work has been developed through the homotopy analysis method (HAM). In this study, special attention has been given to the variable fluid property effects on the flow of Williamson nanofluid. Parmar [8] discussed the unsteady convective boundary layer flow of magnetohydrodynamic (MHD) Williamson fluid over an inclined porous stretching sheet, which is analyzed numerically by using the Runge–Kutta–Fehlberg (R–K–F) fourth- and fifth-order algorithm through the shooting approach. They concluded that there are increases of λ (Williamson fluid parameter) and Kp (porosity parameter) for the skin-friction coefficient, whereas the opposite behavior is noted on heat and mass transfer. Bhatti and Rashidi [9] discussed the combined effects of thermo-diffusion and thermal radiation on Williamson nanofluid over a porous stretching sheet. It is solved numerically using the successive linearization method (SLM) and the Chebyshev spectral collocation method (CSCM). Hayat et al. [10] examined the stagnation point flow of Williamson nanoliquid toward a nonlinear stretching sheet. This problem is analytically solved via a homotopic procedure. Recently, some of researchers [1116] presented a different non-Newtonian nanofluid flow over a stretching surface using the R–K–F fourth-order algorithm through a shooting procedure with the help of matlam software.

The melting effect is defined as the temperature at which solid changes to liquid at a particular atmospheric pressure. The melting heat exchanger phenomenon has received demanding experimental and theoretical studies by upcoming scientists because it has very attractive applications (like glass industry, purification of materials, castings of metals, crystal growth, material processing, latent heat storage, artificial freezing of ground for mining and construction purposes, melting of soil, magma solidification, freezing of soil around the heat exchanger coils of a ground-based pump, melting of permafrost, thawing of frozen grounds, preparation of semiconductor-material thermal energy storage). Recently, Venkateswarlu et al. [17] found that the melting parameter increases for the skin-friction coefficient while opposite behavior was noted on Nusselt number at the solid interface. Hajabdollahi et al. [18] reported that melting heat transfer occurs through relative motion between heating source and a phase change material (PCM). The microstructure of the selective laser melting (SLM) built China low activation martensitic (CLAM) steel plates was analyzed by Huang et al. [19]. Hayat et al. [20] described heat transfer characteristics through the melting process, viscous dissipation, and internal heat generation. The melting performance in different eccentricity (e) and wall temperature (Tw) is obtained through numerical simulation and experiment research was examined by Cao et al. [21]. The melting heat transfer was examined [2226] with experimental and numerical results.

The term “chemical reaction” is an interaction between two or more chemical reacting species in the presence of catalyst. There are two types of chemical reactions, namely, homogeneous and heterogeneous reactions. If the catalyst and reactions have the same phase then the reaction is called as a “homogeneous reaction” and when reactions and catalyst are in a different phase then it is called a “heterogeneous reaction.” These reactions have more applications in industrial processes (like energy transfer in cooling tower, food processing, chemical industries, power and cooling industries for drying, energy transfer in a wet cooling tower, groves of fruit trees, drying evaporation at the surface of a water body, generating electric power, flow in a desert cooler, crops damage because of freezing, chemical vapor deposition on surfaces). The numerical results of homogeneous–heterogeneous reactions on two-dimensional (2D) MHD stagnation point flow over a linear stretching surface were discussed by Ramzan et al. [27]. Krishnamurthy et al. [28] analyzed the impact of chemical reaction on melting heat transfer flow of Williamson nanofluid flow. Ramzan et al. [29] studied the numerical calculation of the coefficient of skin-friction, and local Nusselt and Sherwood numbers are discussed in detail and presented through graphs. Hayat et al. [30] presented the analysis of porous medium and homogeneous–heterogeneous reactions. These results are compared and examined by two cases such as mutliwalled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes (SWCNTs). Some authors [3134] studied heat and mass transfer with chemical reaction influence on magnetohydrodynamic flow in a porous medium over a stretching surface. Recently, some researchers [3537] studied non-Newtonian fluid with a chemical reaction.

The radiative heat transfer has a more significant influence due to tremendous applications such as power generation and nuclear reactor cooling. The nonlinear thermal radiation effect on 3D Jeffrey nanofluid was explored by Ganesh Kumar et al. [38]. Some authors [3941] explored the nonlinear thermal radiation effect on non-Newtonian fluid with convective heat transfer. Hayat et al. [42] analyzed how the convergence series solutions are solved by the homotopic procedure. López et al. [43] determined the optimum values of slip flow with minimum values of global entropy generation rate and also calculated Nusselt number and explored for different conditions.

The major importance of this article is heat generation on MHD Williamson nanofluid flow over a linear stretching surface with Joule heating and viscous dissipation, and nonlinear thermal radiation and chemical reaction are presented. The self-similarity variables work to translate time-independent partial differential equations into a system of ordinary differential equations. The transformed equations are solved numerically through a shooting technique in combination with the R–K–F algorithm in matlab (bvp4) programming. The impact of physical parameters on interested quantities is discussed in detail by plotting graphs in Fig. 1 and numerical values are mentioned in Table 1.

Fig. 1
Fig. 1
Close modal
Table 1

Numerical values of $−Rex1/2Cfx$ and $−Rex1/2Cfy$ with different parameters of Kp, M for A = 0

KpM$−Rex1/2Cfx$$−Rex1/2Cfy$
2.01.2541.254
4.01.4481.443
6.01.6431.638
8.01.8421.83
2.00.0016160.002293
4.00.001660.00251
6.00.0020460.003081
8.00.0024360.003689
KpM$−Rex1/2Cfx$$−Rex1/2Cfy$
2.01.2541.254
4.01.4481.443
6.01.6431.638
8.01.8421.83
2.00.0016160.002293
4.00.001660.00251
6.00.0020460.003081
8.00.0024360.003689

## Mathematical Statement

The 3D MHD Williamson nanofluid flow in a porous medium over a linear stretching surface with viscous dissipation, heat generation, and melting effects is assumed in the stretching flow direction along the xy-surface and the flow is induced by a stretching at z = 0. The magnetic field B0 is applied along the fluid flow direction z. The stretching velocities are taken along the x-direction as Uw = ax and the y-direction as Vw = by.

The general equations of the Williamson fluid are given as
$∇⋅V=0$
(1)
$ρdVdt=∇⋅S+ρb*$
(2)
The Williamson fluid model equations are given by [1,16,20,41]
$S=−pI+τ$
(3)
$τ=[(μ0−μ∞)(1−Γγ˙)−1]A1$
(4)
The first Rivlin–Erickson tensor A1 and shear rate $γ˙$ are defined as
$A1=(∇×V)+(∇×V)′,γ˙=12∑i∑jγ˙ijγ˙ijπ=12ππ=tr(A12)}$
(5)
$γ˙=[(∂u∂x)2+12(∂u∂y+∂v∂x)2+(∂v∂y)2]1/2$
(6)
Consider μ = 0 and $Γγ˙<1$ thus Eq. (4) can be expressed as
$τ=[μ0(1−Γγ˙)−1]A1$
(7)
The extra stress tensor components are
$τxx=2μ0[1+Γγ˙](∂u∂x),τxy=τxy=μ0[1+Γγ˙](∂u∂y+∂u∂x)τyy=2μ0[1+Γγ˙](∂u∂y),τxz=τyz=τzx=τzy=τzz=0}$
(8)
Considering the above, the governing equations of conservative of mass, conservative of momentum, conservative of energy and concentration are formed as
$∂u∂x+∂v∂y+∂w∂z=0$
(9)
$u∂u∂x+v∂v∂y+w∂w∂z=υ∂2u∂z2+2υΓ∂u∂z∂2u∂z2−σB02ρu−υkp*u$
(10)
$u∂u∂x+v∂v∂y+w∂w∂z=υ∂2v∂z2+2υΓ∂v∂z∂2v∂z2−σB02ρv−υkp*v$
(11)
$u∂T∂x+v∂T∂y+w∂T∂z=αm∂2T∂z2−1(ρc)f∂qr∂z+ζ(DB(∂C∂z∂T∂z)+DTT∞(∂T∂z)2)+Q0(T−T∞)(ρcp)+σB02(ρcp)(u2+v2)+μ0(ρcp)(u′2+v′2)}$
(12)
$u∂C∂x+v∂C∂y+w∂C∂z=DB∂2C∂z2+DTT∞(∂2T∂z2)−Km(C−C∞)$
(13)
The boundary conditions of the present model are
$u=Uw(x)=ax,v=Vw(x)=by,w=0,T=Tw,C=Cwatz→0u→0v→0,T→T∞,C→C∞asz→∞$
(14)
and
$k(∂T∂z)z=0=ρ(β+cs(Tm−Ts))w(x,0,0)$
(15)
The radiative heat flux qr which is given by Quinn Brewster [39] is given by
$qr=−4σ*3k*∂T4∂z$
(16)
Neglected higher-order terms we get
$T4=4TT∞3−T∞4$
(17)
Differentiating the above heat flux equation, we get
$∂qr∂z=−16σ*T33k*∂T∂z$
(18)
Substituting Eq. (18) in Eq. (12), we get the below expression
$u∂T∂x+v∂T∂y+w∂T∂z=αm∂2T∂z2+1(ρc)f(16σ*3K*∂∂z(T3∂T∂z))+ζ(DB(∂C∂z∂T∂z)+DTT∞(∂T∂z)2)+Q0(T−T∞)(ρcp)+σB02(ρc)(u2+v2)+μ0(ρc)(u′2+v′2)}$
(19)
The similarity transformations as
$η=aυz,u=axf′(η),v=ayg′(η),w=−aυ(f(η)+g(η))θ(η)=T−T∞Tf−T∞,ϕ(η)=C−C∞Cf−C∞}$
(20)
Solving Eq. (15) by using Eq. (20), we have
$k(Tf−T∞)θ′aυ=ρ(β+cs(Tm−Ts))(−aυf)(Tf−T∞)(β+cs(Tm−Ts))θ′=−ρkυf}$
(21)
Using Eq. (19), we are converting Eqs. (9)(11), (13), and (19) into the below format
$f″′(1+λf″)−(f′)2+f″(f+g)−(M+Kp)f′=0$
(22)
$g″′(1+λg″)−(g′)2+g″(f+g)−(M+Kp)f′=0$
(23)
$Pr((f+g)θ′−f′θ+Nbθ′ϕ′+Nt(θ′)2)+((1+Rd(1+(θw−1)θ))3θ′)′+Hθ+(Ecx(f″)2+Ecy(g″)2)+M2(Ecx(f′)2+Ecy(g′)2)=0}$
(24)
$ϕ″+PrLe(f+g)ϕ′−(Nt/Nb)θ″−Kϕ=0$
(25)
Corresponding boundary conditions as
$f′=1,g=0,g′=A,θ(0)=1,ϕ′(0)=0atη→0f′→0,g′→0,θ→0,ϕ→0asη→∞}$
(26)
and from Eq. (21), we have the melting effect as
$Prf+Mtθ′=0$
(27)
The skin-friction coefficient and local Nusselt number are
$Rex1/2Cfx=−f″(0),Rex1/2Cfy=−g″(0),Rex−1/2Nux=−θ′(0)}$
(28)

## Results and Discussion

The transformed Equations (22)(25) with boundary conditions (26) and (27) have been solved numerically by the R–K–F fourth-order algorithm along with a shooting procedure. To develop the outstanding results of velocity (f′(η), g′(η)) flows along axial and transverse directions, the heat transfer $(Rex−1/2Nux)$ rate due to related physical parameters involved in this investigation with numerical solutions is described through their plotted graphs: Figs. 28 and displays tabulate values of skin-friction coefficients in x, y-directions. Throughout the study different Williamson fluid case and nanofluid case are discussed, and the Prandtl number $(Pr=6.2)$ value of water is taken in this study.

Fig. 2
Fig. 2
Close modal
Fig. 3
Fig. 3
Close modal
Fig. 4
Fig. 4
Close modal
Fig. 5
Fig. 5
Close modal
Fig. 6
Fig. 6
Close modal
Fig. 7
Fig. 7
Close modal
Fig. 8
Fig. 8
Close modal

The variant of the non-Newtonian first Rivlin–Erickson tensor [15] of the fluid declines through “Williamson parameter” (λ) on axial and transverse velocity (f′(η)) and (g′(η)) is shown in Fig. 2. It is demonstrated that the velocity in both axes is diminished with high numerical values of λ. Physically, Williamson fluid is inversely proportional to kinematic viscosity. Due to this, the viscosity is control to velocity of Williamson fluid flow at surface.

The most significant effect Kp (porous parameter) on velocity in x- and y-directions of non-Newtonian nanofluid flow is shown in Fig. 3. The velocity should be diminished along x and y directions for higher values of Kp. Physically, when the motion of non-Newtonian fluid the Darcy resistance existing by porous medium $kp*$ and choosing growth values of Kp correspond to strong resistance flow. Due to this, the fluid velocities are reduced for motion of the porosity surface.

Figure 4 shows the Mt (melting parameter) for fluid $(Pr=6.2)$ and gas $(Pr=0.71)$ cases on θ(η) in Williamson nanofluid motion. The melting heat transfer diminishes with distinct high values of Mt. It is clear that the convergence of the temperature function is monotonically decreasing with high significance for $Pr=6.2$ when compared with gases $Pr=0.71$. Physically, the melting parameter is inversely proportional to latent heat and heat capacity of the solid surface. Due to this, the extra heat is transported from fluid heat toward a solid surface which leads to low convective flow.

The (θw = Tf/T) (temperature ratio parameter) for the cases of Williamson nanofluid (Kp = 0, Nt = Nb = 0.2 λ = 0.5) and nanofluid (Kp = λ = 0, Nt = Nb = 0.2) on θ(η) is as shown in Fig. 5. It is noticed that the temperature distribution is convergent and monotonically increases with large values of θw (Tf/T). The temperature function is monotonically converging at surface (η = 1.5) (not exact value) for Williamson nanofluid (Kp = 0, Nt = Nb = 0.2 λ = 0.5) and nanofluid (Kp = λ = 0, Nt = Nb = 0.2). It is concluded that there is high significant case of nanofluid flow when compared to the Williamson nanofluid case. Physically, the temperature ratio parameter is the interaction between fluid temperature toward surface and ambient temperature flow toward infinite surface. This means that the temperature ratio parameter depends strongly on surface temperature of the fluid.

The variation of viscous dissipation and Joule heating effects in non-Newtonian fluid motion in the presence (Kp = 0.5) and absence (Kp = 0) of porous medium on concentration function along the y-direction with high values of Ecy (Eckert number) is shown in Fig. 6. It is demonstrated that the concentration of viscous dissipation and Joule heating influence amplify along the y-direction with high numerical values of Ecy. Finally, there is high significant influence in the absence (Kp = 0) of a porous medium when comparing with the presence (Kp = 0.5) of the porous medium in non-Newtonian fluid motion.

The variation K (chemical reaction) influence in non-Newtonian fluid motion in the presence (Kp = 0.5) and absence (Kp = 0) of porous medium on the concentration function along stretching surface with high values of K is shown in Fig. 7. It is demonstrated that the concentration function reduces with higher values of K. Finally, in both the physical parameters there is high significant effects in the absence of porous medium (Kp = 0) when comparing in the presence of the porous medium (Kp = 0.5) in non-Newtonian fluid motion on the surface.

Figure 8 shows the variation of $Rex−1/2Nux$ (heat transfer rate) with various choosing values of H (heat generation) via θw for the cases of Williamson fluid (Kp = 0, Nt = Nb = 0 λ = 0.2) and nanofluid (Kp = 0, Nt = Nb = 0.2 λ = 0). It is demonstrated that the rate of heat transport increases with higher values of H and Ecx. Finally, heat transfer significantly increased in nanofluid motion which is more than the Williamson fluid motion on a stretching surface.

## Conclusions

This article is related to the influence of nonlinear thermal radiative and heat generation on 3D magnetohydrodynamic Williamson nanofluid flow with chemical reaction over a linear stretching surface in the presence of the melting condition. It is analyzed with the numerical technique with the fourth-order Runge–Kutta–Fehlberg algorithm.The main outcomes in the present mathematical model is as follows:

• The Williamson nanofluid velocity motion in a porous medium along x- and y-directions slowly converges to zero at stretching surface (η → 0) with increased values of Kp, M, and λ.

• The stretching ratio parameter increases in Williamson nanofluid velocity motion along the x-direction and decreases to zero at a porous surface (η → 0) while a reverse trend occurs in the y-direction.

• The melting influence decrease is more convergent variation on θ(η) in the case of fluid value $(Pr=0.71)$ when compared to gas value $(Pr=6.2)$ with large values of Mt.

• The concentration reduction has more variation in the absence of porous medium (Kp = 0) when compared to gas value (Kp = 0.2) with large values of Ecy and K.

• Overall, the heat transfer rate generation in Williamson nanofluid is more affected than the nanofluid at the same time pure fluid is more than the Williamson nanofluid and also regular fluid is more affected than the nanofluid.

## Acknowledgment

The authors are grateful to the reviewers for their suggestions that extensively improved our paper.

## Conflict of Interest

All procedures performed for studies involving human participants were in accordance with the ethical standards stated in the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards? Informed consent was obtained from all participants. Documentation will be provided upon request. Informed consent was obtained for all individuals. This article does not include any research in which animal participants were involved.

## Data Availability Statement

The authors attest that all data for this study are included in the paper.

## Nomenclature

f =

dimensionless stream function

k =

thermal conductivity

p =

hydrostatic pressure

t =

time

A =

stretching ratio parameter = b/a

C =

volume fraction of nanoparticle

I =

identity tensor

K =

chemical reaction parameter = Km/a

M =

$magneticfieldparameter=σ*B02/aρ$

S =

extra tensor

T =

temperature

V =

velocity field

cp =

specific heat (J kg K)

cs =

surface heat capacity

qr =

radiative heat flux (Wm−2)

A1 =

first Rivlin–Erickson tensor

B0 =

magnetic field strength

Cf =

skin-friction coefficient

C =

uniform ambient concentration

DB =

Brownian diffusion

DT =

thermophoresis diffusion (m2 s−1)

Km =

chemical reaction

Kp =

$porousparameter=υ/kp*$

Nb =

Brownian motion coefficient = ζDB(CwC)/α

Nt =

thermophoresis parameter = ζDT(TwT)/Tα

Q0 =

heat generation

Rd =

$radiationparameter=16σ*T∞2/3kk*$

Tf =

fluid temperature

Tm =

melting temperature

Ts =

surface temperature

Tw =

temperature at the wall

T =

ambient fluid temperature

Uw =

stretching velocity along the y-direction

Vw =

stretching velocity along the x-direction

$b*$ =

constant

f′ =

dimensionless velocity

$k*$ =

mean absorption coefficient

Ecx =

Eckert number in the direction of $x=uw2/(cp)f(Tw−T∞)$

Ecy =

Eckert number in the direction of $y=vw2/(cp)f(Tw−T∞)$

$Rex$ =

Reynolds number

$kp*$ =

porosity

Le =

Lewis number = αm/DB

Mt =

melting parameter (TfT)/(β + cs(TmTs))

$Pr$ =

Prandtl number = (υ/αm)

a, b =

constants

u, v, w =

velocity components

(x, y, z) =

Cartesian coordinate’s

d/dt =

material derivative

$∇$ =

operator

### Greek Symbols

β =

latent heat of the fluid

Γ =

positive time-dependent material constant

ζ =

ratio of the heat capacity and heat capacity nanoparticle of the fluid (ρc)p/(ρc)f

η =

similarity variable

θ =

dimensionless temperature

λ =

Williamson parameter $Γx2a3/υ$

μ =

dynamic viscosity

π =

second invariant strain tensor

ρ =

density

σ =

Boltzmann constant (W m−2K−4)

τ =

Cauchy tensor

υ =

kinematic viscosity

ϕ =

dimensionless concentration

αm =

thermal diffusion = k/ρ

$γ˙$ =

shear rate

μ0 =

limiting viscosity at zero shear rate

μ =

limiting viscosity at infinity shear rate

ρf =

fluid density

(ρc)f =

heat capacity of the fluid

(ρc)p =

heat capacity of the nanoparticle to the fluid

$σ*$ =

electrical conductivity (m2s−1)

### Subscript

∞ =

condition at freestream

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