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Second law analysis and heat transfer in a cross-flow heat exchanger with a new winglet-type vortex generator

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  • Kotcioglu, Isak
  • Caliskan, Sinan
  • Cansiz, Ahmet
  • Baskaya, Senol

Abstract

In this paper a second law analysis of a cross-flow heat exchanger (HX) is studied in the presence of a balance between the entropy generation due to heat transfer and fluid friction. The entropy generation in a cross-flow HX with a new winglet-type convergent–divergent longitudinal vortex generator (CDLVG) is investigated. Optimization of HX channel geometry and effect of design parameters regarding the overall system performance are presented. For the HX flow lengths and CDLVGs the optimization model was developed on the basis of the entropy generation minimization (EGM). It was found that increasing the cross-flow fluid velocity enhances the heat transfer rate and reduces the heat transfer irreversibility. The test results demonstrate that the CDLVGs are potential candidate procedure to improve the disorderly mixing in channel flows of the cross-flow type HX for large values of the Reynolds number.

Suggested Citation

  • Kotcioglu, Isak & Caliskan, Sinan & Cansiz, Ahmet & Baskaya, Senol, 2010. "Second law analysis and heat transfer in a cross-flow heat exchanger with a new winglet-type vortex generator," Energy, Elsevier, vol. 35(9), pages 3686-3695.
    • Handle: RePEc:eee:energy:v:35:y:2010:i:9:p:3686-3695
    DOI: 10.1016/j.energy.2010.05.014
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