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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v30.i7-8.40
pages 448-456

Heat Transfer Enhancement at Vapor Condensation from a Vapor-Air Mixtures on Vertical Tubes

Guenrikh A. Dreitser
Department of Aviation-Space Thermal Techniques, Moscow Aviation Institute, Volokolamskoe shosse, 4, Moscow, 125993, Russia
S. G. Zakirov
Tashkent State Technical University, Tashkent, Uzbekistan

ABSTRACT

Heat transfer enhancement of water and gasoline vapors condensing from a vapor-air mixtures on vertical tubes was investigated. These tubes had transverse annular grooves on the outside surface and diaphragms on its inside surface. An up to 1.9-fold increase of heat transfer in water vapor condensation and an up to 1.7-fold increase at condensing of gasoline vapors with an air content up 6% were obtained. The obtained heat transfer enhancement by turbulators compared with the heat transfer decrease due to the presence of air amounting to 6%. The ratio of heat transfer coefficients on tubes with grooves and those on smooth tubes increases as the rolling groove depth increases and the rolling pitch decreases.


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