Abstract
A study of heat transfer in the thermal entrance region for horizontal concurrent airwater flow over a flat plate has been carried out to complement theoretical studies of the phenomenon. Measurements of the heat transfer characteristics and fluid mechanics parameters have been made for constant wall temperature and constant wall heat flux boundary conditions. The results for smooth surfaces and for hydrodynamically unstable liquid films are compared with the theory for non-rippling films. Theory and experiment are compared in terms of dimensionless parameters that characterize the system, in terms of wall temperature and wall heat flux profiles and as local Nusselt numbers vs. position.
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