Heat transfer in condensation

When vapour comes into contact with a wall, which is at a lower temperature than the saturation temperature of the vapour, the vapour will be liquified at the 

4 Convective heat and mass transfer. Flows with phase change 

The course of this process can be subdivided into several steps, in which a series of resistances have to be overcome. The fraction of these individual resistances in the total resistance can be very different. First, as a result of flow (convective transport) and molecular motion (diffusion transport), the vapour reaches the phase interface. In the next step the vapour condenses at the phase interface, and finally the enthalpy of condensation released at the interface is transported to the cooled wall by conduction and convection. Accordingly, three resistances in series have to be overcome the thermal resistance in the vapour phase, the thermal resistance during the conversion of the vapour into the liquid phase, and finally the resistance to heat transport in the liquid phase. 

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Kumamaru, H., Y. Koizumi, and K. Tasake, 1987, Investigation of Pre- and Post-Dryout Heat Transfer of Steam-Water Two-Phase Flow in Rod Bundles, Nuclear Eng. Design 702 71-84. (4) Kutateladze, S. S., 1952, Heat Transfer in Condensation and Boiling, USAEC Rep. AEC-tr-3770 (Translated from Mashgiz, 2d ed., pp. 76-107, State Sci. Tech. Pub. House of Literature on Machinery, Moscow-Leningrad). (2)... 

Grigull (G8), 1942 Treatment of heat transfer in condensate film on vertical surface, assuming applicability of Prandtl pipe-flow relationships. Comparison with experimental data,... 

Thonon B, Chopard F. Condensation in plate heat exchangers assessment of a general design method. Eurotherm 47, Heat Transfer in Condensation. Elsevier, 1996 10-18. 

Fig. 4.9 Influence of inert gas on the heat transfer in condensation of a forced flow of steam and air

In the process industry, vapour mixtures are frequently liquified with all the components being present in the liquid phase. Alternatively, the vapour mixture may contain inert gases that do not condense. The influence of this type of mixture on the heat transfer in condensation has already been dealt with in section 4.1.4. Therefore, the variation in the heat transfer for a condensate that contains all the components, in larger or smaller amounts, still has to be discussed. 

Isashenko, V.P. Heat transfer in condensation (russ.). Moskau Energia 1977... 

Stephan, K. Heat transfer in condensation and boiling. Berlin Springer-Verlag 1992, p. 127-128... 

In the fourth chapter the heat and mass transfer in condensation and boiling with free and forced flows is dealt with. The presentation follows the book, Heat Transfer in Condensation and Boiling (Berlin Springer-Verlag 1992) by K. Stephan. Here, we consider not only pure substances condensation and boiling in mixtures of substances are also explained to an adequate extent. 

K. Stephan, Heat Transfer in Condensation and Boiling, Springer-Verlag, New York, 1992. 

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