Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/995
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Type: Journal article
Title: Pipeline column separation flow regimes
Author: Bergant, A.
Simpson, A.
Citation: Journal of Hydraulic Engineering, 1999; 125(8):835-848
Publisher: American Society of Civil Engineers
Issue Date: 1999
ISSN: 0733-9429
1943-7900
Statement of
Responsibility: 
Anton Bergant and Angus R. Simpson
Abstract: A generalized set of pipeline column separation equations is presented describing all conventional types of low-pressure regions. These include water hammer zones, distributed vaporous cavitation, vapor cavities, and shocks (that eliminate distributed vaporous cavitation zones). Numerical methods for solving these equations are then considered, leading to a review of three numerical models of column separation. These include the discrete vapor cavity model, the discrete gas cavity model, and the generalized interface vaporous cavitation model. The generalized interface vaporous cavitation model enables direct tracking of actual column separation phenomena (e.g., discrete cavities, vaporous cavitation zones), and consequently, better insight into the transient event. Numerical results from the three column separation models are compared with results of measurements for a number of flow regimes initiated by a rapid closure of a downstream valve in a sloping pipeline laboratory apparatus. Finally, conclusions are drawn about the accuracy of the modeling approaches. A new classification of column separation (active or passive) is proposed based on whether the maximum pressure in a pipeline following column separation results in a short-duration pressure pulse that exceeds the magnitude of the Joukowsky pressure rise for rapid valve closure.
Rights: © ASCE
RMID: 0030006747
DOI: 10.1061/(ASCE)0733-9429(1999)125:8(835)
Appears in Collections:Civil and Environmental Engineering publications
Environment Institute publications

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