Abstract
In this article, the numerical solutions for the heat transfer flow of an upper-convected Maxwell fluid across an exponentially stretched sheet with a chemical reaction on the Cattaneo–Christov heat flux model have been investigated. Using similarity transformation, the controlling system of nonlinear partial differential equations was transformed into a system of ordinary differential equations. The resulting converted equations were solved numerically by a successive linearization method with the help of MATLAB software. A graphic representation was created to analyze the physical insights of the relevant flow characteristics. The findings were presented in the form of velocity, temperature, and concentration profiles. As the relaxation time parameter varied, the local Nusselt number increased. The thermal relaxation time was shown to have an inverse relationship with fluid temperature. Furthermore, the concentration boundary layer becomes thinner as the levels of the reaction rate parameter increase. The results of this model can be applicable in biological fluids and industrial situations. Excellent agreement exists between the analysis's findings and those of the previous studies.
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Introduction
The laminar flow and heat transfer past a stretching sheet have many industrial uses and impact technological processes. In previous studies, it was assumed that the velocity of a stretched surface is linearly proportional to its distance from a fixed origin. Fourier’s1 proposed law on heat conduction has been used as a basis for predicting heat transfer behavior in a variety of real-world contexts. Cattaneo2 modified Fourier’s law to include the relaxation time for heat flux, which is the amount of time required to achieve constant heat conduction after the imposition of a temperature gradient. Straughan3 examined the thermal convection in an incompressible flow using the Cattaneo–Christov model. Ciarletta and Straughan4 showed that the Cattaneo–Christov equations are stable and unique. To account for the Cattaneo–Christov heat flux, Mustafa5 constructed analytical and numerical solutions for rotating Maxwell fluid flow. They found that the Prandtl number and relaxation period for the heat flux are inversely correlated with the fluid temperature. Numerous industrial applications of non-Newtonian fluids with convective heat and mass transfer include the flow of biological fluids, coatings for paper and liquid metals, plastic extrusion, material processing, and crystal growth. Using the Cattaneo–Christov heat flux model, Khan et al.6 investigated the boundary layer flow of an upper-convected Maxwell fluid (UCM) caused by an exponentially extending sheet. They discovered that the fluid temperature and thermal relaxation time are inversely related. The fluid velocity further decreased as the fluid relaxation time increased. By applying the Cattaneo–Christov model, Sohail and Naz7 investigated the Sutterby nanofluid MHD flow for heat and mass diffusion. Williamson studied MHD nanofluid flow via a stretchable plate using fractional Cattaneo–Christov heat theory by Khan and Alzahrani8. Dadheech et al.9, investigated numerical study of entropy generation on Williamson fluid across a permeable vertical plate along with non-liner chemical reaction as well as slip condition. They found that entropy generation rate enhances for higher values of Brinkman number. Recent research that considers the Cattaneo–Christov theory can be found in10,11,12,13,14,15.
Chemical reactions are interactions that occur between substances to create new substances of various chemical compositions. A chemical reaction is a process by which reactants are converted into products16,17. Seini and Makinde18 investigated how the MHD boundary layer moved across an exponentially stretched sheet in the presence of chemical reactions and radiation. By employing the Bvp4c method, Paul and Kanti19 studied a two-dimensional stability issue that integrates the magnetohydrodynamic effect with three separate flows of fluid from the boundary layer across an exponentially stretched sheet under the impact of thermal radiation and chemical reactions. The shooting method20,21, 22, Keller box method23, finite element method24,25, homotopy perturbation method26 and bvp4c27,28,29,30 are numerical methods used to handle some of these issues. The successive linearization method (SLM) has recently been employed by many researchers. The controlling nonlinear equations were transformed using this method into a set of linear differential equations. We applied the Chebyshev pseudo-spectral method to resolve the higher-order deformation in the linear differential equations. According to the Chebyshev spectral collocation differentiation matrix presented in Makukula et al.31, an auxiliary linear operator is defined. Ahmed et al.32 applied the successive linearization method to study the effects of radiation and viscous dissipation on MHD boundary layer convective heat transfer with low pressure gradient in porous media. Khidir33 applied the successive linearization method on the nonlinear boundary value problem of MHD boundary layer analysis for heat and mass transfer. In comparison to other current semi-analytical approaches, such as the Adomian decomposition method, they demonstrated that the SLM swiftly converges to numerical values and is flexible, efficient, and accurate. The SLM approach can also be used to handle boundary value problems involving highly nonlinear systems, instead of more traditional numerical approaches (see references34,35).
The studies mentioned above revealed that no research on the effect of chemical reaction on the Cattaneo–Christov heat flux model for viscoelastic flow over an exponentially stretching sheet has been done. The prime motivation of our analysis is to expand on the findings of Khan et al.6, such as how the Cattaneo–Christov convection flow model affects the viscoelastic flow caused by a chemical reaction-filled slab that grows at an exponential rate. However, because it has numerous applications in chemical and manufacturing processes, such as polymer extrusion, continuous metal casting, copper wire extrusion, die forging, paper production, and many more, the study of viscous flow and heat transfer above stretching surfaces has received a lot of attention. Tables and graphs are used in this study to show the effects of various parameters found in the governing equations. We applied the SLM approach to numerically handle this problem, using a more efficient calculation. Quantitative investigation and plotting of pertinent results.
The rest of the paper is organized as follows. The governing system of nonlinear partial differential equations has been converted into a system of ordinary differential equations in Section "Problem formulation". Section "Numerical methods" deals with the application of SLM to solve our problem. Finally, some numerical results along with a discussion on them are given in Section "Results and discussion".
Problem formulation
Consider an upper-convected Maxwell fluid (UCM) that flows incompressible in two dimensions across an elastic sheet during \(y = 0\) (see Fig. 1). Applying equal and opposite forces along the \(x -\) axis and considering that the flow is bound to the region where \(y > 0\) occurs, the flow is generated as a result of the stretching surface. At time \(t = 0\), unsteady fluid and mass flows begin. The sheet emerges from the origin through a slit and flows at the velocity of the \(U_{w} (x) = {\text{U}}_{0} \,e^{\frac{x}{L}}\). The heating/cooling reference temperature \({\text{T}}_{0}\) is denoted by the variable surface temperature distribution \(T_{w} {\text{ = T}}_{\infty } \, + {\text{T}}_{0} \,e^{{\frac{Ax}{{2L}}}}\)(Magyari and Keller36), and mass concentration \(C_{w} {\text{ = C}}_{\infty } \, + C_{0} \,e^{\frac{x}{2L}}\)( Reddy et al.37), which is considered.
The formulation of the present problem is modelled with respect to following presumptions:
-
1.
Upper-convected Maxwell fluid (UCM) flow
-
2.
Micropolar liquid model
-
3.
Cattaneo–Christov Heat Flux Model
-
4.
Thermophoresis and chemical reaction effects are considered
Under the above assumptions, the governing equations so obtained are given by Khan et al.6
where \({\varvec{V}}\) is the velocity vector, \({\varvec{T}}\) is the Cauchy stress tensor and \({\varvec{a}}\) is acceleration vector given by:
The Cauchy stress tensor for a Maxwell fluid is:
where the extra stress tensor \({\varvec{S}}\) satisfies
in which \(\mu\) is the viscosity, \(\lambda_{1}\) is the relaxation time, \({\varvec{L}}\) is the velocity gradient, and the Rivlin–Ericksen tensor \({\varvec{a}}_{1}\) is defined through
For a two-dimensional flow having velocity \({\varvec{V}}\) one gets in the absence of pressure gradient the following equations in component form
Using the boundary layer approximations38
where \(\delta\) being the boundary layer thickness, the flow is governed by Eq. (9) and
where \(u\) and \(v\) represent the velocity's \(x -\) and \(y -\) directional components, respectively. The following relationship39 holds when \(\upsilon\) is the kinematic viscosity,\(\lambda_{1}\) is the fluid relaxation time, \(T\) is the local fluid temperature, \(k_{1} (x)\) is the chemical reaction rate, and \(q\) is the heat flux which satisfies the following relationship
where \(V\) is the velocity vector, \(k\) is the thermal conductivity, and \(\lambda_{2}\) is the heat-flow relaxation time. We arrive at the following equations after eliminating \(q\) from Eqs. (3) and (4) (see Han et al.40 and Christov41).
where \(\alpha ( = k/\rho c_{P} )\) is the thermal diffusivity.
boundary conditions on velocity
The boundary sheet is assumed to be stretched with a large force in such a way that stretching velocity along the axial direction \(x\) is of exponential order of the directional coordinate. Hence, we employ the following boundary conditions on velocity (see Khan et al.6).
Using the similarity transformations shown below36
We see that similarity exists by substituting Eq. (17) into Eqs. (11) – (16), and we obtain the following:
where \(\Pr = \frac{\upsilon }{\alpha }\) is the Prandtl number, \(S_{c} = \frac{\upsilon }{D}\) is the Schmidt number, \(\gamma\) is the reaction rate parameter, and \(\Lambda_{1} = \frac{{\lambda_{1} U_{0} e^{{{\raise0.7ex\hbox{$x$} \!\mathord{\left/ {\vphantom {x L}}\right.\kern-0pt} \!\lower0.7ex\hbox{$L$}}}} }}{L}\),\(\Lambda_{2} = \frac{{\lambda_{2} U_{0} e^{{{\raise0.7ex\hbox{$x$} \!\mathord{\left/ {\vphantom {x L}}\right.\kern-0pt} \!\lower0.7ex\hbox{$L$}}}} }}{L}\) is the non-dimensional fluid relaxation time and thermal relaxation time. The case of a Newtonian fluid is achieved when \(\Lambda_{1} = 0\) in Eqs. (18)–(21). In addition, \(\Lambda_{2} = 0\) fits the original Fourier law of heat conduction.
The skin friction coefficient \(C_{f}\) defined as:
The heat and mass transfers from the plate, respectively, are given by
Numerical methods
We employed SLM to solve the current problem numerically using MATLAB script file code. The SLM works by iteratively converting the controlling nonlinear Eqs. (18) - (20) into a set of linear differential equations, which are then solved either analytically or numerically.
The SLM technique presupposes that the solutions of systems (18)–(20) can be represented as 31,42
Starting from an initial guess that is appropriate for \(f_{0} (\eta ),\,\,\theta_{0} (\eta )\) and \(\phi_{0} (\eta )\) and satisfies boundary conditions (21), suitable functions are as follows:
Substituting Eq. (22) into controlling Eqs. (18) – (20) while neglecting the nonlinear factors in \(f_{i} (\eta ),\,\,\theta_{i} (\eta )\) and \(\phi_{i} (\eta )\) and their derivatives yields
depending on the conditions at the boundary,
where \(r_{1,i - 1} = \left( {\frac{{\Lambda_{1} }}{2}\left( {\sum\limits_{j = 0}^{i - 1} {f_{j} } } \right)^{2} - 1} \right)\sum\limits_{j = 0}^{i - 1} {f^{\prime\prime\prime}_{j} } + 2\left( {\sum\limits_{j = 0}^{i - 1} {f^{\prime}_{j} } } \right)^{2} + 2\Lambda_{1} \left( {\sum\limits_{j = 0}^{i - 1} {f^{\prime}_{j} } } \right)^{3} \,\)
Using the Chebyshev collocation spectral method43, the linearized system was solved, resulting in the system of equations below:
We can write system (27) as matrix equation as
where \(A_{i - 1} = \left[ {\begin{array}{*{20}c} {A_{11} } & {A_{12} } & {A_{13} } \\ {A_{21} } & {A_{22} } & {A_{23} } \\ {A_{31} } & {A_{32} } & {A_{33} } \\ \end{array} } \right],\,\,X_{i} = \left[ {\begin{array}{*{20}c} {f_{i} } \\ {\theta_{i} } \\ {\phi_{i} } \\ \end{array} } \right],\,\,R_{i - 1} = \left[ {\begin{array}{*{20}c} {r_{1,i - 1} } \\ {r_{2,i - 1} } \\ {r_{3,i - 1} } \\ \end{array} } \right]\,,\)
The resultant system (28) is readily solved as
Results and discussion
This paper analyzed the effects of chemical reaction on the Cattaneo–Christov heat flux model for viscoelastic flow over an exponentially stretching sheet. Transfigured governing Eqs. (18) – (20) with the boundary conditions (21) are coupled non-linear differential equations. Thus, it is impossible to solve directly with the analytical method. Therefore, to solve this coupled non-linear differential equations, we use SLM (SLM) method by MatLabR2023a software. For various values of effective governing parameters such as velocity ratio U, Deborah number \(\Lambda_{1}\), Prandtl number \(\Pr\), Schmidt number \(S_{c}\), reaction rate parameter \(\gamma\), and thermal relaxation time \(\Lambda_{2}\), the numerical solutions of velocity, temperature, and concentration are obtained. The convergence of SLM solutions with respect to several orders of approximations for \(- f^{\prime\prime}(0)\),\(- \theta^{\prime}(0)\) and \(- \phi^{\prime}(0)\) for different values of \(\Lambda_{1}\) when \(\Lambda_{2} = 0.5,\,A = 1.5,\,\)\(\gamma = 1,\,S_{c} = 0.2,\,\Pr = 1,\) is presented in Table 1. The comparison of the variation of the Nusselt number \(- \theta^{\prime}(0)\) for different values of \(\Lambda_{1}\) is presented in Table 2. The values show that our result is in admirable agreement with the results given by researchers Khan6 in limiting conditions. Moreover, a comparison of different values of the Prandtl number \(\Pr\) in the event that \(\Lambda_{1} = \Lambda_{2} = 0\), as well as the local Nusselt number \(\theta^{\prime}_{{}} (0)\) for a range of parameter values are shown in Table 3. It can be observed that when the Prandtl number \(\Pr\) and the parameter \(A\) are increased, the local Nusselt number \(\theta^{\prime}_{{}} (0)\) also grows in magnitude. Furthermore, it has been discovered that there is a strong agreement between the current numerical values of the local Nusselt number \(\theta^{\prime}_{{}} (0)\) and the numerical outcomes covered by Magyari and Keller32. Therefore, we are assured that for the analysis of our problem, the numerical method is appropriate. The SLM findings for the local Nusselt number, local Sherwood number, and skin friction coefficient are shown in Table 4 for various parameter values.
Figure 2 shows what happens to the hydrodynamic boundary layer when a fluid has a nondimensional relaxation time. An increase in \(\Lambda_{1}\) is interpreted as an increase in fluid viscosity. The fluid motion is resisted by increasing viscosity, which causes the velocity to decrease. Given that the Deborah number \(\Lambda_{1}\) is a good indicator of how long it will take a fluid to relax and come to rest when shear tension is eliminated, the thickness of the boundary layer likewise decreases for large \(\Lambda_{1}\) values. Many polymeric liquids that defy the Newtonian fluid model display these kinds of behaviors. The flow between two neighboring layers will decrease with an increase in Deborah number. Velocity and boundary layer thickness are generally reduced as a result.
Figure 3 illustrates the changes in Prandtl number \(\Pr\) when considering the thermal relaxation time. With rising \(\Pr\), the thermal boundary layer's thickness and temperature decrease. which is qualitatively identical to the behavior of \(\Pr\) on \(\theta\) in both scenarios. In particular, the temperature variations of both the Fourier and Cattaneo–Christov heat flux models have the same value as that of \(\theta\). Physically, the thermal diffusivity \(\alpha\) and Prandtl number \(\Pr\) are inversely correlated. The fluid is thought to experience less thermal influence as \(\Pr\) increases. Therefore, when \(\Pr\) increases, the thermal boundary layer becomes thinner. Owing to the thinner thermal boundary layer, the temperature profile is steeper, indicating that the wall slope of the temperature function is greater.
The effect of the temperature exponent \(A\) on the temperature profile is illustrated in Fig. 4. This figure shows the interesting ‘Sparrow-Gregg hill’ (SGH) phenomenon, in which temperature increases first reach their highest point before falling exponentially to zero. This implies that, for some negative reasons, reverse heat flow towards the sheet should be expected. The wall slope of the temperature function increased sharply as the positive/negative temperature exponent parameter \(A\) increased.
The effect of \(\Lambda_{1}\) on the thermal boundary layer is shown in Fig. 5. A larger \(\Lambda_{1}\) produces a stronger viscous force that resists the flow and raises the temperature. As a result, viscoelastic fluid has a higher temperature than a viscous fluid.
Figure 6 shows how the temperature distribution is affected by the nondimensional thermal relaxation time \(\Lambda_{2}\). The thermal relaxation time and \(\theta\) temperature have an inverse relationship. The temperature \(\theta\) approached the free-stream condition at closer ranges above the sheet as \(\Lambda_{2}\) increased. In particular, both Newtonian and Maxwell fluids exhibit similar magnitudes of temperature \(\theta\) changes with the thermal relaxation time.
Figure 7 shows that a decrease in concentration has been associated with an increase in Schmidt number \(S_{c}\). A lower mass diffusivity is associated with a lower Schmidt number \(S_{c}\). This elucidates why the thickness of the boundary layer concentration decreases as \(S_{c}\) increases.
Figure 8 shows how a change in the reaction rate parameter \(\gamma\) affects the concentration profile. We observe that there is a noticeable decrease in concentration with an increase in \(\gamma\). The contour in the free flow is uniformly attenuated to a static value after the velocity climbs noticeably close to the wall. As a result, the chemical reaction speeds up the flow or increases the instantaneous transfer. The concentration boundary layer becomes thinner as the level of \(\gamma\) increase.
Conclusions
In this study, the impact of chemical reaction on the Cattaneo–Christov heat flux model for viscoelastic flow over an exponentially stretching sheet was investigated. governing system of nonlinear PDEs is transformed into a system of nonlinear ODEs using appropriate similarity transformations. The converted system equations were solved using SLM. The numerical results obtained agree very well with previously reported cases available in the literature. The following is a summary of the study's main findings:
-
In viscoelastic fluids, the hydrodynamic boundary layer is thinner than in viscous fluids.
-
The thermal boundary layer thickness and temperature are decreasing functions of the relaxation time \(\Lambda_{2}\).
-
For negative temperature exponent A, there are interesting Sparrow-Gregg Hills (SGH) for the temperature distribution.
-
Fourier's heat conduction law and the Cattaneo–Christov model's parameter responses are qualitatively comparable.
-
The concentration boundary layer becomes thinner as the levels of Schmidt number \(S_{c}\) and reaction rate \(\gamma\) increase.
-
By setting \(\Lambda_{1} = 0\), we can retrieve the current consideration for the Newtonian fluid case.
-
A few SLM iterations were enough to achieve great agreement with previous results.
Data availability
All data generated or analyzed during the study are included in this article.
Abbreviations
- \(\left( {x,y} \right)\) :
-
Cartesian coordinates [m]
- \(\left( {u,v} \right)\) :
-
Velocity components [ms-1]
- \(\upsilon\) :
-
Kinematic viscosity [m2s-1]
- \(\rho\) :
-
Density of fluid [Kg m-1]
- \(q\) :
-
The heat flux
- \(\gamma\) :
-
Chemical reaction rate
- \(k\) :
-
Thermal conductivity
- \(\lambda_{1}\) :
-
Fluid relaxation time
- \(\lambda_{2}\) :
-
Heat flow relaxation time.
- \(T\) :
-
Fluid Temperature [K]
- \(\alpha\) :
-
Thermal diffusivity [m2s-1]
- \(\rho c\) :
-
Fluid capacity heat [J m-3 K-1]
- \(c_{p}\) :
-
Specific heat [J/kg K]
- \(D\) :
-
Diffusion coefficient
- \(L\) :
-
Reference length [m]
- \(A\) :
-
Temperature exponent
- \(P_{r}\) :
-
Prandtl number
- \(S_{c}\) :
-
Schmidt number
- \(\Lambda_{1}\) :
-
Non-dimensional fluid relaxation times
- \(\Lambda_{2}\) :
-
Non-dimensional thermal relaxation times
- \(C_{w}\) :
-
Concentration field at the surface [mol]
- \(C\) :
-
Concentration of field [mol]
- \(C_{\infty }\) :
-
Ambient concentration field [mol]
- \(U_{w}\) :
-
Velocity at the wall [ms-1]
- \(T_{w}\) :
-
Surface temperature [K]
- \(T_{\infty }\) :
-
Ambient temperature [K
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Sidahmed, A.O.M., Salah, F. & Viswanathan, K.K. Impact of chemical reaction on the Cattaneo–Christov heat flux model for viscoelastic flow over an exponentially stretching sheet. Sci Rep 14, 16025 (2024). https://doi.org/10.1038/s41598-024-65642-9
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DOI: https://doi.org/10.1038/s41598-024-65642-9
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