Direct contact condensation of superheated steam on subcooled water in a vertical rectangular channel = 수직사각채널에서 과열증기와 과냉각수의 직접응축열전달에 관한 실험적 연구

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The present study is direct contact condensation experiment for co-current flow in a vertical rectangular channel. The experiment is performed with superheated steam and subcooled water as working fluids. A vertical rectangular channel has a length of 40 cm, a width of 65 mm and a height of 35 mm. Water flow rate, steam flow rate, the degree of subcooling and the degree of superheating are considered as main test parameters. Especially, the degree of superheating is the most important parameter in this study. In the present experiments, total 140 data of heat transfer coefficients are obtained from the various experimental conditions. The water film is very thin, and has complex interface. The flow regime transition does not occur in the present experimental conditions. The heat transfer coefficient (HTC) increases with increase of steam and water flow rates, and is little more sensitive to the steam flow rate than water flow rate. The average heat flux is not affected by steam superheating. However, the HTC is decreased with steam temperature increasing. From the present data, empirical correlation and correcting method are developed in terms of easily accessible parameters for practical purpose. Especially, the correcting method makes it possible to represent the existing correlations. A great difference exists between the present data and several existing correlation.
Advisors
Chang, Soon-Heungresearcher장순흥researcher
Description
한국과학기술원 : 원자력공학과,
Publisher
한국과학기술원
Issue Date
2001
Identifier
165474/325007 / 000993135
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력공학과, 2001.2, [ ix, 58 p. ]

Keywords

vertical; condensation; superheat; cocurrent; 수직채널; 열전달; 응축; 과열증기

URI
http://hdl.handle.net/10203/49431
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=165474&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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