JP Journal of Heat and Mass Transfer
Volume 6, Issue 1, Pages 1 - 16
(February 2012)
|
|
NATURAL CONVECTION FLOW IN A POROUS ENCLOSURE WITH LOCALIZED HEATING FROM BELOW
Md. Mamun Molla, Suvash C. Saha and M. A. I. Khan
|
Abstract: In this study steady natural convection flow in a two-dimensional fluid saturated porous enclosure with localized heating from below has been investigated. A portion of the bottom surface is heated and the symmetrically cooled the side walls and the top and rest of the bottom walls are insulated. An implicit finite volume method with TDMA solver is used to solve the governing equations. Localized heating is simulated by a centrally located isothermal heat source on the bottom wall, and four different values of the dimensionless heat source length, 1/5, 2/5, 3/5 and 4/5 are considered. It is found that the flow field and the isotherm are symmetric owing to the symmetric boundary condition for the parameters considered here. It is also found that the increases of Rayleigh number and the heat source size enhance the heat transfer. The effect of heat source length and the Rayleigh number on streamlines and isotherms are presented, as well as the variation of the local rate of heat transfer in terms of the local Nusselt number from the heated wall. Finally, the average Nusselt number at the heated part of the bottom wall has been shown against Rayleigh number for the non-dimensional heat source length. |
Keywords and phrases: natural convection, porous media, Darcy’s law, localized heating. |
|
Number of Downloads: 244 | Number of Views: 682 |
|