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Heat and Mass Transfer of Laminar Free Convection Film Condensation of Pure Vapor

  • De-Yi Shang
Chapter
Part of the Heat and Mass Transfer book series (HMT)

Abstract

With heat and mass transfer analysis, the theoretical equations for Nusselt number and mass flow rate are provided for the laminar free convection film condensation of vapor where only the wall temperature gradient and condensate mass flow rates are unknown variables, respectively. With increase of the wall subcooled grade, the wall temperature gradient will decrease, especially for lower wall subcooled grade. While, with increase of the vapor bulk superheated grade, the wall temperature gradient will increase. However, the effect of the wall subcooled grade on the wall temperature gradient is more obvious than that of the vapor bulk superheated grade. With increase of the wall subcooled grade, the condensate film thickness will increase, especially for lower wall subcooled grade, while with increase of the superheated grade, the condensate film thickness will decrease. However, the effect of the wall subcooled grade on the condensate film thickness is more obvious than that of the vapor bulk superheated grade. With increase of the wall subcooled grade, the velocity components will increase, especially for the small value of the wall subcooled grade. While with increase of the vapor bulk superheated grade, the velocity components will decrease. As per the results, with increase of the wall subcooled grade, the condensate mass flow rate parameter will increase, especially due to the function of condensate film thickness. While with increase of the vapor bulk superheated grade, the mass flow rate parameter will decrease. However, the effect of the wall subcooled grade on the condensate mass flow rate parameter is more obvious than that of the vapor bulk superheated grade. On the basis of the rigorous numerical solutions, the wall temperature gradient and then mass flow rate parameter are formulated, and then the formulated equations for reliable predictions of heat and mass transfer are created for heat and mass transfer application of the laminar free convection film condensation of water vapor.

Keywords

Heat Transfer Mass Flow Rate Heat Transfer Rate Film Condensation Saturated Water Vapor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

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    D.Y. Shang, T. Adamek, Study of laminar film condensation of saturated steam for consideration of variable thermophysical properties. in Transport phenomena, Science and Technology, ed. by B.X. Wang (Higher Education press, Beijing, 1992), pp. 470–475Google Scholar
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    D.Y. Shang, T. Adamek, Study on laminar film condensation of saturated steam on a Wvertical flat plate for consideration of various physical factors including ariable thermophysical properties. in Warme- und Stoffubertragung 30 (Springer, New York, 1994), pp. 89–100Google Scholar
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    D.Y. Shang, B.X. Wang, An extended study on steady-state laminar film condensation of a superheated vapor on an isothermal vertical plate. Int. J. Heat Mass Transf. 40(4), 931–941 (1997)zbMATHCrossRefGoogle Scholar
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    D.Y. Shang, Theory of Heat Transfer with Forced Convection Film Flows Springer Heildelberg, Dordrecht London, New York, 2011Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.OttawaCanada

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