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Heat Transfer Research
Facteur d'impact: 0.404 Facteur d'impact sur 5 ans: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v29.i1-3.190
pages 190-195

Heat Transfer and Long-Wave Instabilities During Condensation on a Cylindrical Tube in Zero Gravity

Vladimir S. Ajaev
Kutateladze Institute of Thermophysics SB RAS, 1, Lavrentiev Ave, Novosibirsk, 630090, Russia; Department of Mathematics, Southern Methodist University, Dallas TX 75275, USA
Sergey G. Cherkasov
Keldysh Research Center, Russian Space Agency Moscow, Russia

RÉSUMÉ

Heat transfer during condensation of a saturated vapor on a cylindrical tube in zero gravity is considered in connection with the development of cooling sys¬tems for cryogenic fuel tanks. A simple quasi-steady model of the process with a fixed interface temperature was developed earlier (Ajaev & Cherkasov, 1995). In the present study we consider a more general heat exchange model which takes into account unsteady effects, vapor recoil and thermocapillarity. The problem-is reduced to a single evolution equation, which provides a self-consistent descrip¬tion of the long-wave instabilities and their influence on the heat exchange in the system. It is proved analytically that the instabilities can be suppressed if the film thickness is smaller than a certain critical value. We also study the dependence of this critical thickness on different physical parameters. It is shown that the mass flux through the interface and thermocapillary tend to stabilize the film, but vapor recoil has a destabilizing effect.