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

ISBN 打印: 1-56700-132-7

AN EXPERIMENTAL STUDY ON THE COMPOUND ENHANCEMENT OF TUBESIDE HEAT TRANSFER WITH AIR FLOW

Abstract

The techniques of enhancing tubeside heat transfer have been studied extensively. However, the reports of research concerned with the combination of two different techniques, termed compound enhancement are very limited in the literature. In this paper, the experimental results of compound enhancement of tubeside heat transfer with combination of spirally corrugated tubes and twisted-tape inserts are presented. The test facility for the experiments and the experimental method are described. The experiments are conducted for the spirally corrugated tubes and the twisted-tape inserts respectively, and for the combination of spirally corrugated tubes with the twisted-tape inserts. Experiments are performed with air in the fully developmental turbulent region (Re=104-105). Large volumes of experimental data are presented in the paper. Empirical correlations are developed in the form of convenient use for heat exchanger application. Performance evaluation are given for spirally corrugated tubes and twisted-tape inserts, and for the combination of spirally corrugated tubes with twisted-tape inserts.
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