RT Journal Article
ID 77cfab913a65e555
A1 Aly, Abdelraheem M.
A1 Raizah, Z. A. S.
A1 Ahmed, Sameh Elsayed
T1 NATURAL CONVECTION IN AN ENCLOSURE SATURATEDWITH MULTILAYER POROUS MEDIUM AND NANOFLUID OVER CIRCULAR CYLINDERS: ENTROPY GENERATION
JF Journal of Porous Media
JO JPM
YR 2018
FD 2018-09-18
VO 21
IS 10
SP 1007
OP 1024
K1 entropy generation; non-Darcy flow; natural convection; nanofluid; circular cylinders
AB The effect of the presence of circular cylinders on the natural convection in a horizontally partitioned non-Darcy
porous enclosure filled with Cu-water nanofluid was investigated using the finite volume method. In this study, we used one domain approach based on the binary parameters to couple the governing equations for the nanofluid layer
and the porous medium layers. The effects of the Rayleigh number, Darcy number, and porous layer height on the
heat transfer of Cu-water nanofluid and entropy generations were investigated. The two different boundary conditions
for the inner circular cylinders as isothermal and adiabatic boundaries were considered. The effects of the porous layer
height (H = 0.1–0.9), solid volume fraction (φ = 0.0–0.04), Rayleigh number (Ra = 103–106), and Darcy number (Da = 10-5–10-2) were investigated. The current investigations showed that the presence of the circular cylinders with different boundary conditions strongly affect the strength of the stream function, convective heat transfer, and entropy generations. Adding nanoparticles in the partial porous enclosure including inner circular cylinders offered a slight increase in the average Nusselt number, the maximum values of the total entropy generation, and the average Bejan number. The current numerical results are well validated and have favorable comparisons with previously published results.
PB Begell House
LK https://www.dl.begellhouse.com/journals/49dcde6d4c0809db,7f1a4073667d2ab3,77cfab913a65e555.html