Journal of Engineering Thermophysics

, Volume 19, Issue 4, pp 306–317 | Cite as

Flow boiling heat transfer of refrigerant R21 in microchannel heat sink

  • V. V. Kuznetsov
  • A. S. Shamirzaev


Boiling heat transfer in a refrigerant R 21 flow in a microchannel heat sink is studied. A stainless steel heat sink with a length of 120 mm contains ten microchannels with a size of 640×2050 µm at cross-section with a wall roughness of 10 µm. The local heat-transfer coefficient distribution along the heat sink length is obtained. The ranges of parameters are: mass flow from 68 to 172 kg/m2s, heat fluxes from 16 to 152 kW/m2, and vapor quality from 0 to 1. The maximum values of the heat transfer coefficient are observed at the inlet of microchannels. The heat transfer coefficients decrease substantially along the length of channels under high heat flux conditions and, on the contrary, change insignificantly under low heat flux condition. A comparison with the well-known models of flow boiling heat transfer is performed and the range of applicability is defined.


Heat Transfer Heat Sink Froude Number Steam Generator Local Heat Transfer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  1. 1.Kutateladze Institute of Thermophysics, Siberian BranchRussian Academy of SciencesNovosibirskRussia

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