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

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  • Chen, B.H.
  • Huang, W.H.

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.

Suggested Citation

  • Chen, B.H. & Huang, W.H., 1988. "Second-law analysis for heat-transfer enhancement on a rib-type turbulence promoter," Energy, Elsevier, vol. 13(2), pages 167-175.
    • Handle: RePEc:eee:energy:v:13:y:1988:i:2:p:167-175
    DOI: 10.1016/0360-5442(88)90042-4
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    Cited by:

    1. Lee, Dong Hyun & Rhee, Dong-Ho & Kim, Kyung Min & Cho, Hyung Hee & Moon, Hee Koo, 2009. "Detailed measurement of heat/mass transfer with continuous and multiple V-shaped ribs in rectangular channel," Energy, Elsevier, vol. 34(11), pages 1770-1778.

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