A general two-dimensional, time-dependent model has been developed to investigate the transfer of heat and mass in a liquid saturated porous layer locally heated from above. Both free and mixed convection are considered. For mixed convection an external flow is assumed to enter the two-dimensional domain in the horizontal direction. At a finite segment of the top wall, two types of heat sources are applied: a constant flux heat source and a time varying heat, constant flux source. The latter is a representation of heat released by spent nuclear fuel in a mined repository located above the layer. Both time-dependent and steady solutions of the flow and temperature fields are obtained. For natural convection, the effects of Rayleigh number on the Nusselt number are obtained. For mixed convection, the effects of both Rayleigh and Peclet numbers are studied. In addition, the effects of the aspect ratio, as well as the length of the heated zone are examined.
|Original language||English (US)|
|Number of pages||7|
|Journal||American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD|
|State||Published - Dec 1 1997|