Numerical Investigation into Natural Convection and Entropy Generation in a Nanofluid-Filled U-Shaped Cavity

Abstract

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.

Numerical Investigation of Mixed Convection and Entropy Generation in a Wavy-Walled Cavity Filled with Nanofluid and Involving a Rotating Cylinder

“…Increasing functions of entropy generation with the size of the solid insertion and the volume fraction of the nanoparticles were declared. However, the following citations are examples for the case of analyzing the thermodynamic irreversibility in nanofluids; Kashani et al [ 44 ]; Cho et al [ 45 ]; Ting et al [ 46 ]; Ismael et al [ 47 ]; Cho et al [ 48 ]; Chamkha et al [ 49 ]; Chamkha et al [ 50 ]; Rashidi et al [ 51 ]; Qasim et al [ 52 ]; Darbari et al [ 53 ] and Kefayati and Tang [ 54 ]. Very recently, Alsabery et al [ 55 ] have studied the entropy generation inside a porous cavity with wavy walls including a rotating cylinder.…”

Entropy Generation of Carbon Nanotubes Flow in a Rotating Channel with Hall and Ion-Slip Effect Using Effective Thermal Conductivity Model

“…Recently, Alireza et al [ 50 ] investigated entropy generation for MWCNT’s nanofluid flow based on water. A more detailed survey on entropy generation can be found in [ 51 , 52 , 53 ].…”

Numerical analysis of conjugate natural and mixed convection heat transfer of nanofluids in a square cavity using the two-phase method

“…102 There are many numerical studies in this field which have been 103 used homogeneous approach for simulation of the nanofluids 104 [14][15][16][17][18][19]. Purusothaman et al [20], Cho et al [21], Sheremet et al 105 [22], Alsabery et al [23] and Mahmoodi [24] presented a numerical 106 study of natural and mixed convection heat transfer of nanofluid 107 flow in different geometries. They used Maxwell-Garnett [25] 108 and Brinkman [26] models to estimate the effective thermal con-109 ductivity and viscosity of the nanofluid.…”