Abstract
The heat transfer enhancement was studied during condensation of steam on a chilled vertical surface of a tube packed into a granulated material with different contact angles of wetting. The dimensionless values of heat transfer at condensation on a surface in filling, obtained for a vertical tube in the range of Reynolds numbers from 70 up to 400, exceed Nu* values for a smooth tube by the factor of 2–3. The intensification of heat transfer on a vertical tube, housed in a granulated layer, is conditioned by the several interdependent phenomena: 1 — capillary ascent of some liquid near the meniscuses, and as a consequence, reduction of the mean film thickness; 2 — burble of a film at the points of sphere contact with a surface of condensation at Re>10; 3 — removal of some film liquid by a granulated layer; accompanied by simultaneous film burble at the points of sphere contact with a cooling surface at Re>83.
Results of the current research can be used for the development of heat exchanging devices under the conditions of microgravitation.
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References
Gogonin I.I., Kabov O.A.: “Film condensation on the package of finned tubes”. In: Themophysics and hydrodynamics in boiling and condensation processes, Novosibirsk, p. 81–90 (1985).
Briggs A. andRose J.W.: “Effects of fin and efficiency on a model for condensation heat transfer on a horizontal, integral-fin tube”. International Journal of Heat and Mass Transfer, v. 37, p. 457–463 (1994)
Honda H. andWang Y. S.: “Theoretical study of evaporation heat transfer in horizontal microfin tubes: stratified flow model”. International Journal of Heat and Mass Transfer, v. 47, p. 3971–3983 (2004)
Afanasjev Y.O, Dvorovenko I.V, Lazarev S.I., Petrik P.T., Serdakov G.S.: “Influencing of a granulated layer on film condensation”. Heat transfer in steam generators: Materials of All-Union Conf., Novosibirsk, p. 366–372, June (1988).
Petrik P.T., Dadonov P.V., Dvorovenko I.V., Bogomolov A.R.: “Heat transfer at condensation of freon R227 over the inclined tubes, put into a granulated layer”. J. of Engineering Physics and Thermophysics, v. 77, No.4, p. 76–78 (2004)
Bogomolov A.R., Azikhanov S.S., Gutsal K.V., Temnikova E.Yu.: “Hydrodynamics in condensers with a granulated layer”. Thematic part: Transactionses II of a seminar of high schools of Siberia and Far East on a thermophysics and termal power engineering, v.305, No. 2, p. 66–71, Tomsk, October (2002)
Belousov, A.P., Bogomolov A.R., Markovich D.M.: “Hydrodynamic structure of a two-phase flow in vicinity of contact point of elements in balls bed”. Thermophysics and Aeromechanics, v. 11, No. 3, p. 417–427 (2004)
Volkov V.I., Mukhin V.A., Nakoryakov V.E.: “Study of pattern of current in porous medium”. JPCh, v. 54, No. 4. p. 838 (1981)
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Paper was presented on the Second International Topical Team Workshop on TWO-PHASE SYSTEMS FOR GROUND AND SPACE APPLICATIONS October 26–28, 2007, Kyoto, Japan.
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Bogomolov, A.R., Petrik, P.T. & Dvorovenko, I.V. Condensation of steam on a vertical tube in a granulated material. Microgravity Sci. Technol 19, 93–95 (2007). https://doi.org/10.1007/BF02915763
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DOI: https://doi.org/10.1007/BF02915763