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A detailed numerical analysis is carried out to study the transient natural convection in a symmetrically heated vertical plate channel offinite height due to a step change in plate temperature. Both the inlet and exit effects are included in the analysis. I n particular, a numerical scheme derived from the SIMPLER algorithm is employed to solve the governing differential equations. Emphasis is placed on the temporal evoludon of theflaw and thermal characteristics. Results are obtained for air with Ru varying from 10' to lo6 and the aspect ratio from 5 to 10. The existence of multiple cells in the channel and in the region surrounding the tap end during the transient stage is predicted. Over a ceriain period, temperature overshoot is noted, causing a dip in the time variation of the Nusselt number. Correlation equations are proposed for the average Nusseh number and the amount of air drawn into the channel at the steady state.

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