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# Magnetohydrodynamic nanofluid radiative thermal behavior by means of Darcy law inside a porous media

## Abstract

Radiative nanomaterial thermal behavior within a permeable closed zone with elliptic hot source is simulated. Darcy law is selected for simulating permeable media in existence of magnetic forces. Contour plots for various buoyancy, Hartmann numbers and radiation parameter were illustrated. Carrier fluid is Al2O3-water with different shapes. Outputs prove that conduction mode augments with enhance of Ha. Nu augments with considering radiation source term.

## Introduction

Transport processes of nanofluid through medium with porosity have been a challenging study in recent times because of its immense applications in geothermal operations, thermal insulations, food processing, and other petrochemical applications. Modeling of nanomaterial flow with imposing Lorentz forces was scrutinized by Yadav et al.1 and buoyancy force was involved in governing PDEs. A survey present in the literature has shown that thermal properties of nanofluids are better than the usual fluids. Results available have shown that heating properties of solid is larger than liquid. The thermal conductivity engine oil and H2 O are thousand times lower than that of copper (Cu). Some preliminary experiments on Cu−water suspended nanoparticles are performed by Eastman et al.2. In the augmentation of heat transmission, Khanafer et al.3 obtained some interesting results by utilizing nanofluids. The problem studied by Qiang4 studied experimentally for copper based water nanofluid and obtained some interesting results. More detail on the investigation of heat transmission with nanofluids can be found in5,6,7,8,9,10. CuO-water based nanofluid inside absorptive medium in the actuality of magnetic force with Brownian motion is performed by Sheikholeslami11. MHD fluid flow was portrayed by Raju et al.12 over a cone. Kolsi et al.13 employed moved fin to control nanofluid migration through a channel. Different applications of Fe3O4-water nanofluid were categorized by Sheikholeslami and Rokni14. Haq et al.15 utilized carbon nanotubes with slip flow to improve convective heat transfer.

In current study, effects magnetic force and radiation on migration of nanofluid inside a porous medium was illustrated. CVFEM is considered as tool for showing roles of Rd, Ra, & Ha on performance.

## Problem Explanation

The shape of enclosure and its boundary conditions have been demonstrated in Fig. 1. Furthermore, example element was demonstrated. Uniform q″ was imposed on inner wall. Unchanging magnetic field impact on nanomaterial flow style is surveyed. Porous domain has been full of H2O based nanofluid.

### Governing equations and CVFEM

Free convection and radiation impacts on migration of nanofluid inside a penetrable media were pretend under the effect of Lorentz forces. Considering Darcy model, final formulations can be written as:

$$\frac{\partial P}{\partial x}=-\frac{{\mu }_{nf}}{K}u+{B}_{0}^{2}{\sigma }_{nf}[\begin{array}{c}-u{(\sin \gamma )}^{2}+\\ (\sin \,\gamma )v(\cos \,\gamma )\end{array}]$$
(1)
$$\frac{\partial v}{\partial y}+\frac{\partial u}{\partial x}=0$$
(2)
$$\frac{\partial P}{\partial y}=-\,\frac{{\mu }_{nf}}{K}v+(T-{T}_{c})g{\rho }_{nf}{\beta }_{nf}+{B}_{0}^{2}(\cos \,\gamma )[(\sin \,\gamma )u-v(\cos \,\gamma )]{\sigma }_{nf}$$
(3)
$$\begin{array}{c}(v\frac{\partial T}{\partial y}+u\frac{\partial T}{\partial x})=-\,\frac{1}{{(\rho {C}_{p})}_{nf}}\frac{\partial {q}_{r}}{\partial y}+(\frac{{\partial }^{2}T}{\partial {x}^{2}}+\frac{{\partial }^{2}T}{\partial {y}^{2}}){(\rho {C}_{p})}_{nf}^{-1}{k}_{nf},\\ \,\,\,\,\,\,\,\,\,\,[{T}^{4}\cong 4{T}_{c}^{3}T-3{T}_{c}^{4},{q}_{r}=-\,\frac{4{\sigma }_{e}}{3{\beta }_{R}}\frac{\partial {T}^{4}}{\partial y}]\end{array}$$
(4)

Characteristics of nanofluid have following formulas:

$$\begin{array}{rcl}BB & = & \varphi +{(\rho \beta )}_{f}(1-\varphi )/{(\rho \beta )}_{s},BB={(\rho \beta )}_{nf}/{(\rho \beta )}_{s}\\ CC & = & \varphi +(1-\varphi ){(\rho {C}_{p})}_{f}/{(\rho {C}_{p})}_{s},CC={(\rho {C}_{p})}_{nf}/{(\rho {C}_{p})}_{s}\\ {\rho }_{nf} & = & {\rho }_{s}\varphi +{\rho }_{f}(1-\varphi ),\\ \chi -1 & = & \frac{3(A-1)\varphi }{(2+A)+\varphi (1-A)},A={\sigma }_{s}/{\sigma }_{f},\chi =\frac{{\sigma }_{nf}}{{\sigma }_{f}}\end{array}$$
(5)

μnf & knf are represented the Brownian motion forces functions and function of shape factor as mentioned in52:

$$\begin{array}{rcl}{\mu }_{nf} & = & \frac{{k}_{Brownian}}{{\Pr }_{f}}\times \frac{{\mu }_{f}}{{k}_{f}}+{\mu }_{f}{[1-\varphi ]}^{-2.5},TT=Ln(T)\\ {k}_{Brownian} & = & {10}^{4}\times g^{\prime} ({d}_{p},\varphi ,T)\times 5{\rho }_{f}\varphi \sqrt{\frac{{\kappa }_{b}T}{{\rho }_{p}{d}_{p}}}{c}_{p,f}\\ g^{\prime} ({d}_{p},\varphi ,T) & = & ({a}_{7}Ln({d}_{p})+{a}_{9}Ln({d}_{p})Ln(\varphi )+{a}_{8}Ln(\varphi )+{a}_{10}Ln{({d}_{p})}^{2}+{a}_{6})\\ & & +\,TT(\begin{array}{l}{a}_{5}Ln{({d}_{p})}^{2}+{a}_{3}Ln(\varphi )\\ +\,{a}_{2}Ln({d}_{p})+{a}_{1}\\ +\,{a}_{4}Ln({d}_{p})Ln(\varphi )\end{array})\end{array}$$
(6)
$$\begin{array}{rcl}\kappa & = & ({k}_{f}-{k}_{p}),\\ {A}_{4} & = & \frac{{k}_{f}-m\kappa \varphi +{k}_{p}-\varphi \kappa +m{k}_{f}}{m{k}_{f}+{k}_{p}+\varphi \kappa +{k}_{f}+},\end{array}$$
(7)

To get the properties of carrier fluid, we utilized alike model used in52. To estimate temperature dependent properties, Rokni et al.53,54 provide new formulation.

The following non dimensional variables by using of the stream function and, can be gained:

$$\begin{array}{rcl}v & = & -\frac{\partial \psi }{\partial x},\Delta T=Lq^{\prime\prime} /{k}_{f},\\ (Y,X) & = & (y{L}^{-1},x{L}^{-1}),\\ \Psi & = & \psi /{\alpha }_{nf},\,\theta =\frac{T-{T}_{c}}{\Delta T},\\ u & = & \frac{\partial \psi }{\partial y},\end{array}$$
(8)

Thus, the last equations are:

$$\begin{array}{rcl}\frac{{\partial }^{2}\Psi }{\partial {Y}^{2}}+\frac{{\partial }^{2}\Psi }{\partial {X}^{2}} & = & -Ha\frac{{A}_{6}}{{A}_{5}}[\begin{array}{l}2(\sin \,\gamma ){\Psi }_{XY}(\cos \,\gamma )+\\ ({\cos }^{2}\gamma ){\Psi }_{XX}+{\Psi }_{YY}({\sin }^{2}\gamma )\end{array}]\\ & & -\frac{{A}_{3}\,{A}_{2}}{{A}_{4}\,{A}_{5}}\frac{\partial \theta }{\partial X}Ra\end{array}$$
(9)
$$(\frac{{\partial }^{2}\theta }{\partial {X}^{2}})+(1+\frac{4}{3}{(\frac{{k}_{nf}}{{k}_{f}})}^{-1}Rd)\frac{{\partial }^{2}\theta }{\partial {Y}^{2}}=\frac{\partial \theta }{\partial X}\frac{\partial \Psi }{\partial Y}-\frac{\partial \Psi }{\partial X}\frac{\partial \theta }{\partial Y}$$
(10)

Important variables can be introduced as:

$$\begin{array}{l}Rd=4{\sigma }_{e}{T}_{c}^{3}/({\beta }_{R}{k}_{f}),{A}_{5}=\frac{{\mu }_{nf}}{{\mu }_{f}},\\ Ra=\frac{L{(\rho \beta )}_{f}\,Kg\,\Delta T}{{\alpha }_{f}{\mu }_{f}},\\ {A}_{3}=\frac{{(\rho \beta )}_{nf}}{{(\rho \beta )}_{f}},\,{A}_{2}=\frac{{(\rho {C}_{P})}_{nf}}{{(\rho {C}_{P})}_{f}},\,\,{A}_{6}=\frac{{\sigma }_{nf}}{{\sigma }_{f}},\\ {A}_{1}=\frac{{\rho }_{nf}}{{\rho }_{f}},\,{A}_{4}=\frac{{k}_{nf}}{{k}_{f}},\\ Ha=K\frac{{\sigma }_{f}\,{B}_{0}^{2}}{{\mu }_{f}},\end{array}$$
(11)

Inner and outer surfaces have following conditions:

$$\begin{array}{ll}\,\,\,{\theta }={\rm{0}} & {\rm{exterior}}\,{\rm{surfaces}}\\ \frac{\partial {\theta }}{\partial n}=1 & \,{\rm{internal}}\,{\rm{surface}}\\ \,\,\,\Psi =0 & {\rm{over}}\,{\rm{inner}}\,{\rm{and}}\,{\rm{outer}}\,{\rm{walls}}\end{array}$$
(12)

Nuave and Nuloc have been calculated as:

$$N{u}_{ave}=\frac{1}{S}{\int }_{0}^{s}N{u}_{loc}\,ds$$
(13)
$$N{u}_{loc}=(\frac{{k}_{nf}}{{k}_{f}})\frac{1}{\theta }(1+\frac{4}{3}Rd{(\frac{{k}_{nf}}{{k}_{f}})}^{-1})$$
(14)

### Simulation technique, grid and verification

Combine of two influential approaches has been assembled in CVFEM. As explained in ref.33 and shown in Fig. 1(b), such grid is applied in CVFEM. Final equations have attainment to values of θ, Ψ by using of Gauss-Seidel technique. Table 1 exhibits the sample for grid management. This procedure should be done because last result should be immaterial of grid size. Verifications of current code for nanofluid convective flow are displayed in Fig. 2 3. These observations show nice accuracy of CVFEM code.

## Outcome and Discussion

Radiative nanofluid heat transmission through a penetrable enclosure by means of Darcy law was displayed. Effects of Brownian motion and shape factor on nanomaterial behavior were examined. CVFEM was applied to display the variations of Rayleigh number (R a = 100 to 600), radiation (Rd = 0 → 0.08), Concentration of Alumina (ϕ = 0 to 0.04) and magnetic forces (Ha = 0 to 20). Deviations of Nu respect to m are represented in Table 2. Higher value of Nu is described for Platelet shape. Thus, it is designated for more simulations. Role of scattering Al2O3 in H2O have exemplified in Fig. 3. It is observed that $$|{\psi }_{\max }|$$ and Nu enhances by diffusing Al2O3. Since Lorentz force acting, the impact of ϕ on isotherms is not important. Impacts of substantial parameters on isotherms and streamlines are displayed in Figs 4, 5 and 6. $$|{\psi }_{\max }|$$ rises with increase of buoyancy effect while it diminishes with escalation of Ha. Simulations for higher Ra leads to complex shape of isotherm with imposing greater buoyancy forces and thermal plume appears. Imposing Lorentz forces make suppress the plume and isotherms force to being parallel to each other’s. For better description, below formula was derived and Fig. 7 was displayed.

$$\begin{array}{c}N{u}_{ave}=3.05+0.85Rd+0.49Ra-0.7Ha+0.14Rd\,Ra-0.18Rd\,Ha\\ \,\,\,\,\,\,\,-0.47RaHa-0.1R{a}^{2}\end{array}$$
(15)

Greater values of radiation parameter and Ra lead to thinner boundary layer which indicates greater Nuave. Slender thickness of boundary layer was seen with reduce of Hartmann number which proves reduction effect of Hartmann number on Nuave.

## Conclusions

Imposing Lorenz forces influence on nanomaterial flow by means of Darcy law inside a porous enclosure is reported. Shape factor role was involved to predict nanomaterial properties as well as Brownian motion. CVFEM modeling was done to find the variations of Lorentz and buoyancy forces and radiation parameter on nanofluid thermal characteristic were demonstrated. The concluded points are given as

• Outputs depict that Nu improves with improve of buoyancy force but it decrease with augment of Ha.

• Higher value of Nu is described for Platelet shape.

• Nu augments with considering radiation source term.

• As Ha enhances, the velocity of working fluid decreases.

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## Acknowledgements

This project was supported by the Theoretical and Computational Science (TaCS) Center under Computational and Applied Science for Smart Innovation Research Cluster (CLASSIC), Faculty of Science, KMUTT. This research was funded by the Center of Excellence in Theoretical and Computational Science (TaCS-CoE), KMUTT.

## Author information

Authors

### Contributions

M.S. and Z.S. modeled and solved the problem. Z.S. and T.T.N. wrote the manuscript. P.K. contributed in the numerical compuattuions and plotting the graphical results. T.T.N. and A.S. edited the manuscript grammatically and thoroughly checked the mathematical modeling and English corrections. All the corresponding authors finalized the manuscript after its internal evaluation.

### Corresponding authors

Correspondence to Trung Nguyen-Thoi or M. Sheikholeslami or Zahir Shah or Poom Kumam.

## Ethics declarations

### Competing Interests

The authors declare no competing interests.

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Nguyen-Thoi, T., Sheikholeslami, M., Shah, Z. et al. Magnetohydrodynamic nanofluid radiative thermal behavior by means of Darcy law inside a porous media. Sci Rep 9, 12765 (2019). https://doi.org/10.1038/s41598-019-49269-9

• Accepted:

• Published:

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