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Maßnahmen zur Verbesserung des Wärmeübergangs bei der Kondensation
Author(s) -
Renz Ulrich
Publication year - 1984
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.330561102
Subject(s) - vapours , condensation , heat transfer , thermodynamics , heat transfer coefficient , materials science , chemistry , physics , neuroscience , biology
Measures to improve heat transfer for condensation. In the search for measures to improve the heat transfer for condensation, one has to differentiate between condensation of pure vapours and that of mixtures of vapours. For pure vapours a considerable proportion of the heat transfer resistance is associated with the condensed film. The heat transfer can therefore be improved either by reducing the film thickness or by increasing the heat transport across the film. For mixtures of vapours the heat transfer coefficient at the phase interface is often decisive, and one has to investigate the vapour behaviour rather than the condensed film. The present article surveys the options available to improve the heat transfer for film condensation of pure vapours on vertical surfaces, and as well in vertical or horizontal passed pipes as on pipes in a transverse stream.