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Condensation (Chapter 15)

Published

Author(s)

Mark A. Kedzierski, J C. Chato, T J. Rabas

Abstract

Condensation is the process by which a vapor is converted to its liquid state. Because fo the large internal energy difference between the liquid and vapor states, a significant amount of heat can be released during the condensation process. For this reason the condensation process is used to many thermal systems. In general, a vapor will condense to liquid when it is cooled sufficiently or comes in contact with something (e.g., a solid or another fluid) that is below its equilibrium temperature. This chapter is primarily concerned with convective condensation (condensation of a flowing vapor in a passage) and vapor-space condensation (condensation of stagnate vapor onto a surface). Film condensation occurs when the condensate completely wets the surface in a continuous liquid film and can be associated with either convective or vapor-space condensation. Dropwise condensation - usually associated with vapor-space condensation - occurs when the condensate "beads up" on the surface into drops of liquid as a consequence of the liquid's lack of affinity for the surface. Heat transfer coefficients for dropwise condensation can be one-to-two orders of magnitude greater than that for film condensation. Unfortunately, dropwise condensation is not easily sustained in practice.
Citation
Handbook of Heat Transfer
Publisher Info
John Wiley & Sons, -1

Keywords

condensation , convective condensation , dropwise condensation , filmcondensation , heat transfer , NIST , vapor-space condensation

Citation

Kedzierski, M. , Chato, J. and Rabas, T. (2003), Condensation (Chapter 15), John Wiley & Sons, -1 (Accessed March 1, 2024)
Created January 1, 2003, Updated February 19, 2017