Numerical Study of Mixed Convection Inside a Γ-Shaped Cavity with Mg(OH2)-EG Nanofluids

چکیده مقاله

In the present study, numerical simulation of mixed convection flow and heat transfer within a Γ-shaped cavity has been investigated. The cavity filled with Mg(OH2)-Ethylene Glycol nanofluid with variable properties and heated from two walls while the top lid is kept at constant cold temperature. The study is performed for Richardson numbers ranging from 0.01 to 100, inclination angles ranging from 0 to 90°, aspect ratios ranging from 0.15 to 0.75 and for different solid volume fractions (0, 0.002, 0.004, 0.008, 0.015, and 0.02) at given Richardson number. Streamlines, temperature fields and Nusselt number diagrams are present at different studied cases. Results show that for all inclination angles at various aspect ratios ranging from 0.15 to 0.5, with increasing solid nanoparticles volume fraction up to 0.015, the average Nusselt number enhances and then decreases. In these aspect ratios, for all solid nanoparticles volume fractions, the average Nusselt number at inclination angle equal to 90o is greater than it at the other. Furthermore, with increasing inclination angle from 0 to 90°, the maximum enhancement of average Nusselt number is 39.8% which occurs at nanoparticles volume fraction of 0.008 and aspect ratio of 0.75.