Transition to a Free-surface flow at end of a horizontal conduit
作者:
J.S. Montes,
期刊:
Journal of Hydraulic Research
(Taylor Available online 1997)
卷期:
Volume 35,
issue 2
页码: 225-241
ISSN:0022-1686
年代: 1997
DOI:10.1080/00221689709498428
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Observation indicates that if the discharge in a conduit exceeds a certain value, the flow springs out from the whole outlet cross section, but below this discharge, the flow detaches itself from the top of the conduit before the outlet and forms a cavity whose shape and position is stable. A reduction of the discharge allows the cavity to move upstream, at first gradually, then with further discharge reductions a rapid motion can be detected, and in the end, the whole length of the conduit is seen to return to the free-surface regime, signalling the end of the cavity-flow regime. The discharges that mark the initiation and end of the cavity flow are close, so that this phase of the transitional flow is relatively abrupt.
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