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

KOTCİOĞLU İ., Caliskan S., CANSIZ A., Baskaya S.

ENERGY, cilt.35, sa.9, ss.3686-3695, 2010 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 35 Sayı: 9
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.energy.2010.05.014
  • Dergi Adı: ENERGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.3686-3695
  • Anahtar Kelimeler: Vortex generators, Cross-flow heat exchanger, epsilon-NTLU, Entropy generation, ENTROPY GENERATION, THERMODYNAMIC OPTIMIZATION, MASS-TRANSFER, PERFORMANCE
  • Atatürk Üniversitesi Adresli: Evet

Özet

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. (C) 2010 Elsevier Ltd. All rights reserved.