Aspect ratio effects of an adiabatic rectangular obstacle on natural convection and entropy generation of a nanofluid in an enclosure

Autor:	M. Nikfar, G. A. Sheikhzadeh
Rok vydání:	2013
Předmět:	Natural convection Mechanical Engineering Principle of maximum entropy Thermodynamics Rayleigh number Mechanics Nusselt number Bejan number Physics::Fluid Dynamics Nanofluid Mechanics of Materials Entropy (information theory) Adiabatic process Mathematics
Zdroj:	Journal of Mechanical Science and Technology. 27:3495-3504
ISSN:	1976-3824 1738-494X
Popis:	In the present study, aspect ratio (AR) effects of a centered adiabatic rectangular obstacle numerically investigated on natural convection and entropy generation in a differentially heated enclosure filled with either water or nanofluid (Cu-water). The governing equations are solved numerically with finite volume method using the SIMPLER algorithm. The study has been done for Rayleigh numbers between 103 and 106, the aspect ratio of 1/3, 1/2, 1, 2 and 3 and for base fluid as well as nanofluid. It is found that, using the nanofluid leads to increase the flow strength, average Nusselt number and entropy generation and decrease the Bejan number especially at high Rayleigh numbers. At low Rayleigh numbers entropy generation is very low. By increasing Rayleigh number, entropy generation and Bejan number increases. It is observed that the viscose entropy generation is more considerable than the thermal entropy generation and has dominant role in total entropy generation. The maximum entropy generation occurs at AR = 1/3 and 3 and the minimum entropy generation occurs at AR = 1 and 1/2. It is observed that the effect of AR on Nusselt number, entropy generation and Bejan number depends on Rayleigh number.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1b4b3bbd751034fef9ad5e418c63666a https://doi.org/10.1007/s12206-013-0875-3 Zobrazit plný text záznamu Full text from SpringerLink