Theoretical and Experimental Study of Heat and Mass Transfer from Non-Isothermal Surfaces

The numerical solution of the partial differential equation in the incompressible turbulent boundary layer has been obtained for step q sub w u sub 1 C sub p square root of C sub f2 and for Prandtl numbers 0.7, 1 and 7. The Schmidt method of integration was used and the integration was carried out on a Ferranti Pegasus Digital Computer. A method has been developed to apply this numerical solution for obtaining surface and fluid temperature for the case of arbitrary distribution of heat flux at the surface. Simultaneously, approximate equations for calculating heat transfer over a flat plate with arbitrary heat flux are derived for laminar and turbulent flow. To verify the theoretical solution, experiments were made in which the concentration profiles of the injected gas carbon dioxide at different stations were measured when the pipe had another gas air flowing turbulently through in the axial direction, and the gas injected was passed through a porous section of the tube wall.