ISSN Online: 2377-424X
ISBN Print: 0-89116-559-2
International Heat Transfer Conference 8
CONJUGATE HEAT TRANSFER FROM A DOWNWARD PROJECTING FIN IMMERSED IN A POROUS MEDIUM
Resumo
The problem in which a rectangular fin, which is embedded in a saturated porous medium, with only the fin base temperature and ambient fluid temperature prescribed is investigated. Both the mixed and natural convection situations are considered and also the case where the fluid flow opposes the natural flow due to buoyancy. The governing boundary layer equations are expressed in the variables appropriate to the natural convection from a fin at a constant temperature, and the resulting equations are discretised using central differences throughout. A very accurate solution is obtained using the Richardson extrapolation method. It is found that flow reversals occur for - 0.98 < Pe/Ra < 0 when CCP = 1.0. Increasing the forced convection increases the heat flow from the system whilst surrounding the fin with a saturated porous medium reduces the heat flow as compared with a fin immersed in a free fluid. These results are indicated by a reduction and an increase in the temperature of the fin respectively.