Measurement of void fraction in air-water two-phase flow using optical probe = 기액이상류에서 광탐침을 이용한 기공율 측정

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An experimental study of bubble distribution at various flow regimes has been carried out in air-water two-phase flows flowing upward in a 40mm diameter acrylic tube under atmospheric pressure. To obtain local void fraction, U-shaped optical probe is used. The probe signal is amplified by electric circuit. The amplified signal is sampled uniformly using the analog to digital converter and stored and processed in IBM-PC/AT computer. The probe was very sensitive to the existence of air and water phase and can be used to obtain not only local void fraction but also other interesting parameters. In bubbly and slug flow regimes, the signals of the probe are different and this difference in the signal shape may be used as an indirect indication of the flow pattern transition. In this study, local time-averaged void fraction is measured and bubble behavior is observed at various flow rates. Results show that in bubbly flow, wall peaks of void fraction occur near tube wall and in slug flow, void fraction is maximum at tube center.
Advisors
Chang, Soon-Heungresearcher장순흥researcher
Description
한국과학기술원 : 핵공학과,
Publisher
한국과학기술원
Issue Date
1991
Identifier
67986/325007 / 000891150
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 핵공학과, 1991.2, [ v, 56 p. ]

Keywords

Void fraction.

URI
http://hdl.handle.net/10203/49261
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=67986&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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