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- Publisher
- Springer Journals
- Copyright
- 2011 Pleiades Publishing, Ltd.
- ISSN
- 0869-8643
- eISSN
- 1531-8699
- DOI
- 10.1134/S086986431104007X
- Publisher site
- See Article on Publisher Site
Abstract
Abstract The paper presents the results of experimental investigation of heat transfer and hydrodynamics of falling films of binary mixtures of R21 and R114 freons on the surfaces with complex configuration. The vertical tubes of 50-mm diameter with the smooth and structured surfaces, made of D16T alloy, were used as the working sections. The range of film Reynolds number at the inlet to the working section was Re =10÷155. The image of wave surface of the falling liquid film was visualized and recorded by a high-speed digital video camera. At evaporation the heat transfer coefficients on the smooth and structured surfaces are determined by the liquid flow rate and weakly depend on the heat flux. At low liquid flows, the heat transfer coefficients on the structured surface decrease in comparison with the smooth surface because of liquid accumulation and enlargement of efficient thickness in microtexture channels. At high liquid flows, a change in the structure of the wave film surface leads to an increase in heat transfer coefficients in comparison with the smooth surface.
Journal
Thermophysics and Aeromechanics – Springer Journals
Published: Dec 1, 2011