Pressure drop characteristics of R134a during flow boiling in a single rectangular micro-channel

Keepaiboon C., Thiangtham P., Mahian O., DALKILIÇ A. S., Wongwises S.

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, cilt.71, ss.245-253, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 71
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1016/j.icheatmasstransfer.2015.12.013
  • Dergi Adı: INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.245-253
  • Anahtar Kelimeler: Pressure drop, Micro-channel, R134a, Flow boiling, HORIZONTAL TUBES, REFRIGERANTS, PREDICTION, CO2
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

The pressure-drop characteristics during flow boiling in a single rectangular micro-channel with hydraulic diameter of 0.68 mm are presented. In the present study, pressure drop was studied at heat flux range of 7.63-49.46 kW/m(2), mass flux range of 600-1400 kg/m(2) s, and saturation temperature of 23, 27 and 31 degrees C. Experimental results indicated that the total pressure was dominated by frictional pressure drop. The increase of mass flux also increased the frictional pressure gradient, whereas the increase of saturation temperature reduced the frictional pressure gradient. In addition, heat flux also had an insignificant effect on the frictional the pressure gradient. A new correlation was also proposed for effective design of micro-channel heat exchanger. (C) 2015 Elsevier Ltd. All rights reserved.