Abstract
This current work studies the heat transfer performance and entropy generation of natural convection in a nanofluid-filled U-shaped cavity. The flow behavior and heat transfer performance in the cavity are governed using the continuity equation, momentum equations, energy equation and Boussinesq approximation, and are solved numerically using the finite-volume method and SIMPLE C algorithm. The simulations examine the effects of the nanoparticle volume fraction, Rayleigh number and the geometry parameters of the U-shaped cavity on the mean Nusselt number and total entropy generation. It shows that the mean Nusselt number increases and the total entropy generation reduces as the volume fraction of nanoparticles increases. In addition, the results show that the mean Nusselt number and the total entropy generation are both increased as the Rayleigh number increases. Finally, it also shows that mean Nusselt number can be increased and the total entropy generation can be reduced by extending the length of the low temperature walls or widening the width of the low temperature walls.
Highlights
During all fluid flow and heat transfer processes, useful energy will be lost due to the generation of irreversibilities
Their results have indicated that depending on the Rayleigh number and irreversibility distribution ratio, the total entropy generation of the cavity was dominated by the heat transfer irreversibility or by the fluid friction irreversibility
The results presented in the study show that the mean Nusselt number can be increased and the total entropy generation can be reduced by widening the width of WL extending the length of H L, or increasing the volume fraction of nanoparticles
Summary
During all fluid flow and heat transfer processes, useful energy will be lost due to the generation of irreversibilities. Kefayati [13] presented a numerical investigation into the entropy generation due to natural convection in a non-Newtonian nanofluid-filled cavity bounded by two isothermal vertical walls and two adiabatic horizontal walls Their results showed that the Bejan number reduced as the Rayleigh number increased. Cho et al [15] investigated the entropy generation induced by natural convection in a water-based nanofluid-filled cavity bounded by a left wavy-wall with a constant heat flux, a right wavy-wall with a constant low temperature, and flat upper and lower walls with adiabatic conditions Their results showed that the entropy generation could by minimized via an appropriate tuning of the wavy surface geometry parameters. U-shaped cavity on the mean Nusselt number and total entropy generation
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