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Heat Transfer Research

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v38.i6.10
pages 483-493

Heat Transfer in Boiling and Ascending Flow Modes in Vertical Rectangular Small-Size Channels

Vladimir Kuznetsov
Kutateladze Institute of Thermophysics of Siberian Branch of Russian Academy of Sciences
Alisher S. Shamirzaev
Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
I. N. Ershov
Novosibirsk State University, Novosibirsk, Russia


In the paper, the data of experimental studies of heat transfer and hydrodynamics of two-phase vapor(gas)-liquid flows in vertical rectangular channels with a gap on the order of the capillary constant are presented. It is shown that boiling of liquid in confined conditions is characterized by a high probability of coalescence of bubbles and appearance of a slug flow, and the velocity of surfacing of slugs in such channels is basically determined by the flow of liquid in the channel corners and the slugs float to the surface even at very small Eotvos numbers. Data on the heat-transfer coefficients are given for Freon R-21 boiling in a plate-and-rib heat exchanger under the conditions of natural liquid circulation.