HEAT TRANSFER BY CONVECTION AND CONDUCTION FROM THE FLUID MOVING AT SOLID WALLS

Autor/autori: Associate Professor Ph.D. Amado George STEFAN, Lt.Eng., doctoral student Constantin NISTOR

Abstract: The paper shows the convective heat transfer in flat plate with similitude Nusselt criterion. The report ? ?0 25 Pr Pr , f / p takes account of changes in thermal properties of the boundary layer thickness. Thermal conductivity is the only possible way to transmit heat in solids mass. If fluid transfer occurs only when it is at rest or when macroscopic flow is laminar them, but in the last Heat Transfertransmite boundary layer of heat and fluid flow, whether laminar or turbulent character's current. Size a ? ? / ??? c? [m2/s] is called the temperature diffusivity or temperature conductivity. The size of the report depends on the speed with which transmits a temperature variation in substance considered. Heat transfer is modeled shoulders from a central jet of warm air from outside coaxial jet of cold air.

Keywords: heat transfer, thermodynamics.

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