Abstract
For a turbulent natural convection boundary layer in water along a vertical flat plate, the variation of local heat transfer rates is examined by inserting split heat transfer promoters consisting of short flat plates aligned at fixed intervals into the boundary layer. By changing the size and the inclination angle of the promoter, it is recognized that the local heat transfer rate downstream of the promoter locally increased up to approximately 40% as compared to that without promoter. Simultaneous measurement of velocity and temperature are also conducted with a PIV and a thermocouple rake, and the mechanism of heat transfer enhancement is discussed.
