Convective Filmwise Condensation of Nonazeotropic Binary Mixtures in a Vertical Tube

[+] Author and Article Information
S. Mochizuki, Y. Yagi, R. Tadano

Departmant of Mechanical Engineering, Tokyo University of Agriculture and Technology, Koganei-City, Tokyo, Japan

Wen-Jei Yang

Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, Mich. 48109

J. Heat Transfer 106(3), 531-538 (Aug 01, 1984) (8 pages) doi:10.1115/1.3246711 History: Received August 10, 1983; Online October 20, 2009


Complete condensation of binary mixtures of R11-R114 refrigerants is experimentally and theoretically studied. The test apparatus consists of two concentric tubes, with the vapor mixture flowing downward in the inner tube and the cooling water in the annular space in countercurrent direction. The composition of the binary-component mixtures is varied. An empirical equation is derived to correlate condensation heat transfer performance. A semitheoretical model is developed to predict laminar- and turbulent-film condensation on a vertical surface. Theory compares well with experiments. The vapor-coolant temperature difference remains practically constant throughout the entire flow passage, thus reducing the exergy loss to a minimum. The device is particularly attractive in extracting the available energy from geothermal and ocean thermal energy sources.

Copyright © 1984 by ASME
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