Abstract
The effect of free stream turbulence on surface heat transfer was investigated for a smooth flat plate. The free stream turbulence was introduced by a turbulence grid. Turbulence intensity was measured with a hot-wire anemometer both in the boundary layer and in the main stream. Under the same conditions, the local heat transfer coefficient on the flat plate surface was measured using an unsteady method. The heat transfer coefficient was found to increase with increasing turbulence level, rapidly in the range of small turbulence level and slowly in the high range. At a turbulence level of 7–8%, the heat transfer coefficient levels off to a value about 55% higher than that obtained for very small free stream turbulence.
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