Entropy generation through hexagonal cross-sectional duct for constant wall temperature in laminar flow

Oztop H., Sahin A. Z., Dagtekin I.

INTERNATIONAL JOURNAL OF ENERGY RESEARCH, cilt.28, sa.8, ss.725-737, 2004 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 28 Sayı: 8
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1002/er.994
  • Dergi Adı: INTERNATIONAL JOURNAL OF ENERGY RESEARCH
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.725-737
  • Anahtar Kelimeler: entropy generation, second law analysis, hexagonal duct, pumping power, laminar flow, HEAT-TRANSFER
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

Second law analysis of heat transfer in laminar flow for hexagonal cross-section duct was analysed analytically. Geometrical effect of hexagonal duct was considered. The variation of total entropy generation was studied along the duct length. As a working fluid water and unused engine oil were used to compare the effect of fluid in the duct. Results were compared with circular cross-section duct. It is found that the non-dimensional entropy generation in a hexagonal cross-section duct can be as high as a factor of four than that for a circular duct. Further, the unused engine oil gives up to about ten times lower non-dimensional entropy generation values than that of water but needs about ten times more pumping power to heat transfer ratio. Copyright (C) 2004 John Wiley Sons, Ltd.