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Heat Transfer Research
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ISSN Print: 1064-2285
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v32.i1-3.90
7 pages

Heat Transfer in Boiling of Nonazeotropic Mixtures of Refrigerating Agents within a Horizontal Tube

G. N. Danilova
St. Petersburg State Academy of Cold and Foodstuff Technologies, Russia
V. G. Bukin
Astrakhan State Technical University, Russia
V. F. Shurshev
Astrakhan State Technical University, Russia

ABSTRACT

We present the results of an experimental investigation of heat transfer in boiling of the nonazeotropic mixture R22/R142b in the interior of a horizontal tube. The regimes of flow of a liquid-vapor stream in a tube are elucidated. It is found that the intensity of heat transfer depends on the regimes of flow and is determined by the mutual effect of bubble boiling and forced convection. The characters of the dependences of the heat transfer coefficients on the basic regime parameters in boiling of a mixture and of its components are qualitatively the same. The greatest discrepancies are observed in the region where bubble boiling prevails. It is found that a substantial effect on bubble boiling is exerted by mass transfer, with its maximum falling on the region with the concentration of R22 in liquid 0.30−0.40 kg/kg. The generalization of the obtained experimental results on heat transfer is made with account for the specific features of the bubble boiling of mixtures.


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