Study and Application of Hemispheric Cavities for Surface Heat Transfer Augmentation

Abstract

Results of experimental study of heat transfer and flow phenomena associated with application of hemispheric cavities to augment convective heat transfer are presented. Study is performed for different geometries and various flow parameters, including turbulence. Experimental correlations for the curved surfaces applicable to gas turbine internal airfoil cooling are obtained and analyzed for both heat transfer and pressure losses. Effectiveness of the augmentation technique, considering a simplicity of fabrication process, is emphasized.