### Abstract

A numerical study of the natural convection combined with thermal radiation inside a square porous cavity filled with a fluid of temperature-dependent viscosity is carried out. The side horizontal walls are assumed to be adiabatic while both the left and right vertical walls are kept at constant but different temperatures. The Rosseland diffusion approximation is used to describe the radiative heat flux in the energy equation. The governing equations formulated in dimensionless stream function, vorticity and temperature variables are solved using finite difference method. A parametric analysis illustrating the effects of the radiation parameter (0 ≤ R_{d} ≤ 10), Darcy number (10^{-5} ≤ Da ≤ 10^{-2}) and viscosity variation parameter (0 ≤ C ≤ 6) on fluid flow and heat transfer is implemented. The results show an essential intensification of convective flow with an increase in the radiation parameter.

Original language | English |
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Journal | Thermal Science |

Volume | 2016 |

DOIs | |

Publication status | Published - 2016 |

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### Keywords

- Natural convection
- Numerical method
- Porous medium
- Square cavity
- Temperature-dependent viscosity
- Thermal radiation

### ASJC Scopus subject areas

- Renewable Energy, Sustainability and the Environment

### Cite this

*Thermal Science*,

*2016*. https://doi.org/10.2298/TSCI150722164A