Numerical studies are reported for steady mixed convection in two-dimensional horizontal porous layer with localized heating from below. The effects of the size of heat source on the temperature and flow fields, and heat transfer rates are examined for a wide range of Rayleigh and Peclet numbers. Multiple convective cells have been observed as is the case in natural convection, provided that the length of the heat source is greater than the height of the porous layer. The effects of the externally-induced flow on the multiple convective cells are also discussed. The local heat transfer rates have been observed to be significantly influenced by the number and size of the convective cells. When the Rayleigh number is small, the average heat transfer rate increases with Peclet numbers. For a higher Rayleigh number, (Ra* greater than equivalent to 100), there exists a critical Peclet number for which the overall heat transfer rate is a minimum.
|Original language||English (US)|
|Title of host publication||Unknown Host Publication Title|
|Number of pages||7|
|State||Published - Jan 1 1987|