Second-law analysis for heat-transfer enhancement on a rib-type turbulence promoter

B.H. Chen and W.H. Huang

Energy, 1988, vol. 13, issue 2, 167-175

Abstract: The second law of thermodynamics has been applied to determine entropy production for rib-type turbulence promoters in channel duct flow in order to develop a criterion to assess heat-transfer performance. Correlations of heat-transfer coefficient and friction factor are obtained by using Tanasawa's experimental data and several numerical examples are given, which show the distribution of entropy-production rate and other parameters vs Reynolds number for various values of eH and open area ratios β. A new parameter Na is proposed to describe the ratio of augmentation of heat-transfer efficiency to degradation of availability by irreversibility. Since Na is larger than unity, the increase of the heat-transfer efficiency by an enhancement technique is greater than the available work loss. A performance-evaluation criterion based on the entropy-production theorem is found to be more appropriate than a first-law analysis in low Reynolds number conditions.

Date: 1988
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:13:y:1988:i:2:p:167-175

DOI: 10.1016/0360-5442(88)90042-4

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