Natural convection of a hybrid nanofluid subjected to non-uniform magnetic field within porous medium including circular heater

International Journal of Numerical Methods for Heat and Fluid Flow - Tập 29 Số 4 - Trang 1211-1231 - 2019
Mohsen Izadi1, Nemat Mashoofi Maleki2, Ioan Pop3, S.A.M. Mehryan4
1Mechanical Engineering Department, Lorestan University, Khorramabad, Iran
2Shahid Beheshti University, Tehran, Iran
3Department of Applied Mathematics, Babes-Bolyai University, Cluj-Napoca, Cluj, Romania
4Young Researchers and Elite Club, Yasooj Branch, Islamic Azad University, Yasooj, Iran

Tóm tắt

Purpose This paper aims to numerically investigate the natural convection heat transfer of a hybrid nanofluid into a porous cavity exposed to a variable magnetic field. Design/methodology/approach The non-linear elliptical governing equations have been solved numerically using control volume based finite element method. The effects of different governing parameters including Rayleigh number (Ra = 103 − 106), Hartman number (Ha = 0 − 50), volume fraction of nanoparticles (φ = 0 − 0.02), curvature of horizontal isolated wall (a = 0.85 − 1.15), porosity coefficient (ε = 0.1 − 0.9) and Darcy number (Da = 10−5 − 10−1) have been studied. Findings The results indicate that at low Darcy numbers close to 0, the average Nusselt number Nua enhances as porosity coefficient increases. For a = 1 and a = 1.15 in comparison with a = 0.85, the stretching of the isothermal lines is maintained from the left side to the right side and vice versa, which indicates increased natural convection heat transfer for this configuration of the top and bottom walls. In addition, at higher Rayleigh numbers, by increasing the Hartmann number, a significant decrease is observed in the Nusselt number, which can be attributed to the decreased power of the flow. Originality/value The authors believe that all the results, both numerical and asymptotic, are original and have not been published elsewhere.

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International Journal of Numerical Methods for Heat and Fluid Flow

Tập 29 Số 4

1211-1231

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