Heat transfer characteristics of flow boiling in a single horizontal microchannel

Gian Piero Celata, Sujoy Kumar Saha, Giuseppe Zummo, Denam Dossevi

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Abstract

Heat transfer characteristics of subcooled flow boiling of FC-72 in a single horizontal circular cross-section microchannel (480 μm i.d., 800 μm o.d., 102 mm long) are presented. Different flow patterns, both in the stable and unstable flow boiling regimes, have been captured using high speed video camera. Data in small, medium, high and very high heat flux cases under small, medium and high mass flux has been presented. Convective heat transfer coefficients in each flow boiling situation have been calculated and presented. Stable flow boiling with alternating bubbly/slug flow, slug/annular flow and annular/mist flow have been observed for heat flux of 150 kW/m2or higher and mass flux of 1500 kg/m2s or higher. Back and forth oscillations with flow instabilities have been observed in cases of lower heat and mass fluxes. However, no complete reverse flow in upstream direction has been observed. © 2010 Elsevier Masson SAS. All rights reserved.
Original languageEnglish
Pages (from-to)1086 - 1094
Number of pages9
JournalInternational Journal of Thermal Sciences
Volume49
Issue number7
DOIs
Publication statusPublished - Jul 2010

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All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Condensed Matter Physics

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