Second Law analysis in concentric heat exchangers with vortex flow generators

Argunhan Z., Behcet R., Yildiz C., Cakmak G.

ENERGY EDUCATION SCIENCE AND TECHNOLOGY PART A-ENERGY SCIENCE AND RESEARCH, cilt.28, sa.1, ss.285-292, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 28 Sayı: 1
  • Basım Tarihi: 2011
  • Dergi Adı: ENERGY EDUCATION SCIENCE AND TECHNOLOGY PART A-ENERGY SCIENCE AND RESEARCH
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.285-292
  • Anahtar Kelimeler: Heat exchanger, Entropy generation number, Second Law, Vortex Generator, TRANSFER ENHANCEMENT, ENTROPY GENERATION, ENERGY EFFICIENCY, PERFORMANCE, TUBE, INSERTS
  • Van Yüzüncü Yıl Üniversitesi Adresli: Hayır

Özet

In the present study, the experimental results of heat transfer of a concentric tube heat exchanger were analyzed with respect to Second Law of Thermodynamics to reach the geometric optimal design of the heat exchangers. In order to increase the heat transfer, the vortex generators were placed in the entrance of the inner pipe of the heat exchanger. These vortex generators are 60 mm in diameter having six angled ( 55 degrees, 65 degrees, 75 degrees, 90 degrees) winglets. The winglets have one rectangular slot in each and are 2x7 mm in dimensions. Experiments were carried out with different Reynolds Numbers. Air as hot fluid and water as cold fluid were passed through the inner pipe and outer pipe of the concentric tube heat exchanger, respectively. The variations of the efficiency and Entropy Generation Number with respect to Reynolds Number are shown in graphics, and the results were discussed.