抄録
An experimental study on heat transfer enhancement for a laminar natural convection boundary layer along a vertical flat plate has been performed by inserting flat plates set in array at fixed intervals (split heat transfer promoter) in the spanwise direction of the boundary layer. As a result, the local heat transfer rates in the downstream region of the promoter substantially increase. By visualizing flows with smoke and laser sheet, it is found that the increase in heat transfer rates is mainly caused by the longitudinal vortex motions formed with the split heat transfer promoter. Thus, placing several columns of split heat transfer promoters in the flow direction may result in heat transfer enhancement in the wide range of the laminar natural convection boundary layers.
