Condensation of steam in a channel flow in the presence of noncondensable gases with surface resistance

Abraham Tamir, Yehuda Taitel

Research output: Contribution to journalArticlepeer-review

Abstract

The mechanism of steam condensation in the presence of noncondensable gases (air) and with surface resistance is studied in this work. The case considered is a cold laminar stream of water flowing down by gravity along a channel and vapor condenses on its surface. This situation exists in one of the many cells of a direct contact flash distillation plant where the vapor escaping from a hot brine condenses on fresh water flowing in a parallel channel. The model was solved by the integral method and numerical results were obtained for a particular case where comparison with experiment is amenable(1). Our analysis predicts lower values for the interfacial noncondensables concentration (about 50% of the experimental data). The difference is attributed to turbulence caused by obstacles placed normal to the liquid stream flow in the reported experiment. As would be expected, the effect of the interfacial resistance is appreciable mainly near the "leading edge" (smallx*) and diminishes towards high values of x*. The relative increase of noncondensables interfacial concentration was found to be higher at low pressures, depending also on the interfacial resistance magnitude. A possibility of predicting this behaviour by applying a simplified model for the condensation process is demonstrated.

Original languageEnglish
Pages (from-to)293-306
Number of pages14
JournalDesalination
Volume8
Issue number3
DOIs
StatePublished - Dec 1970

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