Laminar mixed convection in a vertical flat channel with constant wall temperature
E.P. Valueva
National Research University MPEI, Moscow, Russia
Keywords: laminar mixed convection, flat channel, heat transfer, hydraulic resistance
Abstract
The problem of laminar mixed convection is considered in a flat vertical channel with lifting and lowering flow and liquid heating, i.e., for cases of coincidence of the directions of free and forced convection, as well as their opposite directions. The solution of the system of equations of motion, continuity and energy is performed by the finite difference method. Data on the profiles of the longitudinal velocity, temperature, and Nusselt numbers at the lifting and lowering flows have been obtained. An explanation is given for the peculiarities of these values under the influence of buoyancy force. All components of the hydraulic resistance coefficient for lifting and lowering flow have been analyzed. The influence of the Prandtl number and the velocity profile at the channel input on the hydrodynamic and thermal characteristics of the flow is considered.
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