Authors: M Kumari G Nath
Publish Date: 2008/10/09
Volume: 77, Issue: 3, Pages: 463-474
Abstract
Unsteady natural convection flow in a twodimensional square cavity filled with a porous material has been studied The flow is initially steady where the lefthand vertical wall has temperature T h and the righthand vertical wall is maintained at temperature T c T h T c and the horizontal walls are insulated At time t 0 the lefthand vertical wall temperature is suddenly raised to barT rm hbarT rm h T rm h which introduces unsteadiness in the flow field The partial differential equations governing the unsteady natural convection flow have been solved numerically using a finite control volume method The computation has been carried out until the final steady state is reached It is found that the average Nusselt number attains a minimum during the transient period and that the time required to reach the final steady state is longer for low Rayleigh number and shorter for high Rayleigh number
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