Condensation heat transfer in rectangular microscale geometries

Srinivas Garimella, Akhil Agarwal, Brian M. Fronk

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Heat transfer coefficients during condensation of refrigerant R134a in small hydraulic diameter (100 < Dh < 160 μm) rectangular (1 < AR < 4) channels are presented. A novel technique to accurately determine condensation heat duty and heat transfer coefficient in such microscale geometries at small Δx is used. Models in the literature that were developed for larger tubes are shown to under predict the data. A new model that accounts for the flow mechanisms during condensation at such small scales, and takes into account the effect of G, x, Tsat, Dh and AR, is developed. The model predicts 94% of the data in the intermittent, transition and annular flow regimes within ±25%.

Original languageEnglish (US)
Pages (from-to)98-110
Number of pages13
JournalInternational Journal of Heat and Mass Transfer
StatePublished - Sep 1 2016

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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