Numerical simulation of mixed convection in a porous medium filled with water/Al₂ O₃ nanofluid

Abstract

The present work encloses the application of a Brinkman-extended Darcy model in a problem concerning mixed convection in a lid-driven porous cavity using nanofluids. The transport equations are solved numerically by the finite volume method on a co-located grid arrangement using the Quadratic Upstream Interpolation for Convective Kinematics (QUICK) scheme. The effects of governing parameters, namely, Grashof number (Gr), Darcy number (Da), and solid volume fraction (χ), on the streamlines and the isotherms are studied. The present results are validated by favorable comparisons with previously published results and are in good agreement with them. The present numerical results show that the addition of nanoparticles to a base fluid has produced an augmentation of the heat transfer coefficient and it is found to increase significantly with an increase of the particle volume concentration. It is observed from the results that at the higher value of the Grashof number (Gr = 10 4 ), the average Nusselt number increases with an increase in the Darcy number for a constant solid volume fraction. The detailed results are reported by means of streamlines, isotherms, and Nusselt numbers.

Mixed Oscillation Flow of Binary Fluid with Minus One Capillary Ratio in the Czochralski Crystal Growth Model

“…As a result, the forced convection is formed and simultaneously mixed with the natural convections. The mixed flow is very complex as the surface capillary forces and body forces interact on different scales, making it difficult for the flow stability to be well recognized and controlled [7,8]. However, the stability of the mixed convection plays a key role in the growth of high-quality crystals.…”

Elucidating the Effects of Cu‐Nanoparticles in a Porous Medium vis‐à‐vis Heat Transfer Phenomena

“…Therefore, a computational fluid dynamics model is developed to scrutinize the multifaceted effects of nanoparticles in a porous medium. Previously, a detailed analysis of flow and heat transfer processes for Al 2 O 3 based nanofluid in a porous media was studied by Mittal and colleagues . Their work motivated us to investigate the effects of Cu‐nanoparticles because of their higher heat transfer enhancement as compared to Al 2 O 3 and TiO 2 .…”

Numerical Simulation of Mixed‐Convection Flow in a Lid‐Driven Porous Cavity Using Different Nanofluids

“…Recently, Mittal et al studied the numerical analysis of mixed convection flow in a lid‐driven porous cavity filled with a water‐Al 2 O 3 nanofluid. The effects of governing parameters, such as Grashof number ( Gr ), Darcy number ( Da ), and solid volume fraction ( χ ) on streamline patterns and isotherm was performed.…”

“…In this article, authors are extending their earlier work for presenting the comprehensive investigation on the combined forced and natural convection flow in a lid‐driven cavity comprised of a porous medium for four different nanofluids. The selected nanoparticles are aluminum oxide (Al 2 O 3 ), copper (Cu), silver (Ag), and titanium dioxide (TiO 2 ).…”