Paper Info
Title
Entropy Generation Analysis and Natural Convection in a Nanofluid-Filled Square Cavity with a Concentric Solid Insert and Different Temperature Distributions.
Abstract
The problem of entropy generation analysis and natural convection in a nanofluid square cavity with a concentric solid insert and different temperature distributions is studied numerically by the finite difference method. An isothermal heater is placed on the bottom wall while isothermal cold sources are distributed along the top and side walls of the square cavity. The remainder of these walls are kept adiabatic. Water-based nanofluids with Al2O3 nanoparticles are chosen for the investigation. The governing dimensionless parameters of this study are the nanoparticles volume fraction (0 <= phi <= 0.09), Rayleigh number (10(3) <= Ra <= 10(6)), thermal conductivity ratio (0.44 <= K-r <= 23.8) and length of the inner solid (0 <= D <= 0.7). Comparisons with previously experimental and numerical published works verify a very good agreement with the proposed numerical method. Numerical results are presented graphically in the form of streamlines, isotherms and local entropy generation as well as the local and average Nusselt numbers. The obtained results indicate that the thermal conductivity ratio and the inner solid size are excellent control parameters for an optimization of heat transfer and Bejan number within the fully heated and partially cooled square cavity.
Year
DOI
Venue
2018
10.3390/e20050336
ENTROPY
Keywords
Field
DocType
natural convection,entropy generation,finite difference method,nanofluid,inner solid insert,square cavity
Mathematical optimization,Nusselt number,Isothermal process,Heat transfer,Bejan number,Mechanics,Rayleigh number,Natural convection,Mathematics,Thermal conductivity,Nanofluid
Journal
Volume
Issue
ISSN
20
5
1099-4300
Citations 
PageRank 
References 
2
0.44
2
Authors
4
Name
Order
Citations
PageRank
Ammar I. Alsabery123.15
Muhamad Safwan Ishak220.44
Ali J. Chamkha3175.99
Ishak Hashim47516.70