A NOVEL CONCEPT FOR CONVECTIVE HEAT-TRANSFER ENHANCEMENT

An analog between convection and conduction with heat sources is made to have a further understanding of the mechanism of convective heat tr ansfer. There are three ways to raise the strength of heat sources/con vection terms, and consequently to enhance the heat transfer: (a) incr easing Reynolds and/or Prandtl number, (b) increasing the fullness of dimensionless velocity and/or temperature profiles, (c) increasing the included angle between the dimensionless velocity and temperature gra dient vectors. Some approaches of heat transfer enhancement are sugges ted based on such a novel concept of heat transfer enhancement. (C) 19 98 Published by Elsevier Science Ltd. All rights reserved.