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Heat Transfer Research
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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561

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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 V. Kuznetsov
The Kutateladze Institute of Thermophysics SB RAS, 1 Lavrentieva Ave., Novosibirsk, 630090, Russia; Novosibirsk State University, 2 Pirogova Str., Novosibirsk 630090, Russia
Alisher S. Shamirzaev
The Kutateladze Institute of Thermophysics SB RAS, 1 Lavrentieva Ave., Novosibirsk, 630090, Russia
I. N. Ershov
Novosibirsk State University, Novosibirsk, Russia

ABSTRAKT

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.


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