Publication Cover
Numerical Heat Transfer, Part A: Applications
An International Journal of Computation and Methodology
Volume 28, 1995 - Issue 5
27
Views
13
CrossRef citations to date
0
Altmetric
Original Articles

TRANSIENT NATURAL CONVECTION OF WATER NEAR ITS DENSITY EXTREMUM IN A RECTANGULAR CAVITY FILLED WITH POROUS MEDIUM

&
Pages 619-633 | Received 23 Nov 1994, Accepted 13 Jun 1995, Published online: 02 Mar 2007
 

Abstract

A numerical study is performed to analyze the transient flow field and heat transfer behavior of cold water in a rectangular enclosure filed with a porous medium. The numerical method was employed by the SIMPLE-C algorithm. The accurate nonlinear relation between density and temperature developed by Gebhart and Mollendorf was used. The numerical results show that, for R < 0 · 5, the size of the clockwise vortex beside the high-temperature surface increases as time increases. The clockwise vortex occupies almost the whole space when the steady state is reached. For R = 0 · 5, the size of the clockwise vortex adjacent to the high-temperature surface increases as time increases. However, two counterrotation vortices having the same strength and size exist in the space when steady state is reached. For R > l, only one counterclockwise vortex exists in the space the entire time. For τ > 10−3, the heat transfer rate increases with increase in Darcy number for the entire time. However, as time increases, the heat transfer rate on the high-temperature surface decreases and that on the low-temperature surface increases.

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.