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Proceedings of Symposium on Energy Engineering in the 21<sup>st</sup> Century (SEE2000) Volume I-IV

ISSN:
1-56700-132-7 (Print)

NOVEL CONCEPT AND APPROACHES OF HEAT TRANSFER ENHANCEMENT

Zengyuan Guo
Department of Engineering Mechanics Tsinghua University, Beijing 100084, P.R. China

S. Wang
Department of Engineering Mechanics Tsinghua University, Beijing 100084, P.R. China

Abstract

According to the analogy between convection and conduction with heat sources, three ways are used to enhance convective heat transfer, including the increase of Re and Pr numbers, uniformity of velocity and temperature profiles, and the included angles of velocity and temperature vectors. With the latter two ways, further understanding can be obtained for the conventional heat transfer enhancement techniques on the one hand and some new approaches of heat transfer enhancement techniques have been suggested on the other hand. Analytical and experimental studies show that the enhancement approaches aimed at improving the coordination of flow and temperature fields or direct improvement of uniformity of fluid temperature profile can remarkably enhance heat transfer with less additional pressure drop.