Effect of hydraulic diameter on flow boiling in rectangular microchannels

Markal B., AYDIN O., Avci M.

HEAT AND MASS TRANSFER, cilt.55, sa.4, ss.1033-1044, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 55 Sayı: 4
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1007/s00231-018-2482-4
  • Dergi Adı: HEAT AND MASS TRANSFER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1033-1044
  • Anahtar Kelimeler: Flow boiling, Hydraulic diameter, Flow visualization, Microchannel, HEAT-TRANSFER, PRESSURE-DROP, ASPECT RATIO, MASS FLUX, CHANNELS, INSTABILITIES, PATTERNS, REGIMES
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

An experimental study is conducted to investigate the effect of hydraulic diameter on the saturated flow boiling characteristics of deionized water in parallel rectangular microchannels. Experiments have been performed for the mass fluxes of 51, 65, 78 and 93kgm(-2)s(-1), and the hydraulic diameters of 100, 150, 200 and 250m. The wall heat flux ranges from 35.9 to 105.6kWm(-2). To eliminate the effect of aspect ratio and to address clearly the effect of hydraulic diameter, all the channels are designed with square cross section. Flow visualization studies are performed for a better understanding of the underlying physical phenomena. Effects of heat flux, mass flux and vapor quality on the heat transfer and total pressure drop have been investigated, too. It is concluded that hydraulic diameter has significant influence on both of the local two phase heat transfer coefficient and the total pressure drop.