Abstract
During film condensation of water vapor one achieves in practice mean heat transfer coefficients of between approximately 4000 W/m2K and 10 000 W/m2K. If vapors of organic substances are condensed, the mean heat transfer coefficients are seldom over 2500 W/m2K. By contrast, heat transfer coefficients during drop condensation of organic vapors are ten to twenty times greater than those of film condensation. The heat transfer coefficients of the coolant lie between 4000 W/m2K (achieved with, for example, cooling water of 35 °C, velocity 1.1 m/s, tube inner diameter 0.04 m, tube length 1.33 m), and 6000 W/m2K (upon raising the water velocity to 1.8 m/s). Because the thermal resistance of the metallic wall can generally be ignored, the heat transfer coefficient on the condensate side controls the heat transfer, especially during the film condensation of organic vapors. It is, therefore, very worthwhile to seek ways to improve the heat transfer coefficient on the condensate side. In the literature, one finds a great number of suggestions, of which only a few have found their way into practice.
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Stephan, K. (1992). Enhancement of Heat Transfer During Condensation. In: Heat Transfer in Condensation and Boiling. International Series in Heat and Mass Transfer. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-52457-8_8
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DOI: https://doi.org/10.1007/978-3-642-52457-8_8
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