RESUMEN

The combined effect of rotation and heating on the thermal stability of flow in a porous medium is studied when the temperatures involved are large for radiative heat transfer to be significant. The porous medium is confined between two rotating cylinders and both the angular velocity and temperature of the inner cylinder are higher than those of the outer. Hence instability can set in either as a result of unfavorable distribution of thermal gradient or angular momentum gradient. In this study rotational instability sets in first, under normal conditions, and this can be contrasted with the case in which radiative heat transfer is absent and thermal instability is more fatal.