HEAT AND MASS TRANSFER AT OUTSIDE SURFACE OF BUILDINGS : Wind tunnel tests of heat and mass transfer on horizontal surfaces

The experiments which determine the heat and mass transfer characteristics at wall surfaces were carried out on the floor of a flat rectangular duct through which turbulent air flow was passed. Air flow speed, air temperature, surface temperature and heating method were changed as the experiment parameters. The measured Nusselt and Sherwood numbers were found to have some correlation with the Reynolds and Grashof numbers through all the experiments. Namely, the measured Nusselt and Sherwood numbers can be approximately calculated from the Reynolds and Grashof numbers by the proposed equations. The ratio between Nusselt and Sherwood numbers which were obtained by the experiments agrees well with that from the analogy between heat transfer and mass transfer.