Abstract
Double-diffusive natural convection in a rectangular fluid-saturated porous medium has been studied analytically and numerically. The analysis reveals that there is a range of buoyancy ratio N in which one obtains two types of solutions or oscillating convection. In the case of 0.4<N<1.0, there exist two analytical solutions when RC=100 and Le=30. In that case, two solutions, temperature-dominated and concentration-dominated solutions, are calculated when aspect ratio is small. It is found that the oscillation is due to temporal formation of a two-roll flow pattern in the cavity when aspect ratio is sufficiently large. The oscillation of time-dependent Nusselt number and flow patterns are shown.
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