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- W2069127985 abstract "Steady laminar and transient oscillatory mixed convection of a low Prandtl number fluid in a symmetrically heated vertical plane channel subject to an opposing buoyancy is investigated by solving the transient two-dimensional flow and energy equations. Results are particularly presented to illustrate the effects of buoyancy strength Gr/Re2 and Reynolds number Re. At a fixed Reynolds number, the flow is steady and unidirectional for a long time for a very small Gr/Re2. At a higher Gr/Re2, steady flow reversal is noted. An oscillatory flow with a single fundamental frequency is found when Gr/Re2 exceeds a critical value (which is about— 1.2 with Re = 500). Flow asymmetry appears at a certain time instant. Further increasing the opposing buoyancy, a secondary fundamental frequency sets in and the flow is quasiperiodic. The effect of increasing the Reynolds number is to stabilize the flow. Besides, in the initial transient the larger Reynolds number results in a longer duration in which a number of symmetric cells oscillate longitudinally. Finally, the transition of various flow patterns can be clearly distinguished by noting a sudden change of the average Nusselt numbers." @default.
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- W2069127985 date "1993-10-01" @default.
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- W2069127985 title "Steady and oscillatory opposing mixed convection in a symmetrically heated vertical channel with a low-Prandtl number fluid" @default.
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