DIRECT CONTACT CONDENSATION OF DILUTE STEAM/AIR MIXTURES ON WAVY FALLING FILMS
作者:
T. D. KARAPANTSIOS,
M. KOSTOGLOU,
A. J. KARABELAS,
期刊:
Chemical Engineering Communications
(Taylor Available online 1996)
卷期:
Volume 141-142,
issue 1
页码: 261-285
ISSN:0098-6445
年代: 1996
DOI:10.1080/00986449608936419
出版商: Taylor & Francis Group
关键词: Direct contact condensation;Noncondensables;Steam/air;Falling films
数据来源: Taylor
摘要:
Condensation from air-steam mixtures on falling water layers is investigated experimentally and theoretically. The thin film flows on the inner surface of a 5cmi.d. vertical pipe. This film is wavy turbulent while the gas phase is kept saturated with steam. Experiments are conducted with the gas mixture effectively stagnant, compared with the fast moving liquid film. Measurements are also made under a mild vacuum applied on the gas phase. Heat transfer coefficients averaged over the entire length of the condensing surface, tend to increase by decreasing the liquid flowrate, by increasing the steam fraction, and by applying a mild vacuum on the gas phase. However, for the cases examined, there is a liquid flowrate above which the heat transfer coefficient becomes almost constant.
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