Simpson, A.Wylie, E.2013-11-122013-11-121991Journal of Hydraulic Engineering, 1991; 117(10):1310-13160733-94291943-7900http://hdl.handle.net/2440/80903Water-hammer pressures in a pipeline due to the collapse of a vapor cavity adjacent to a valve are investigated. A water-hammer event is initiated by the closure of a valve in a simple reservoir-pipeline-valve system. The sequence of events following an instantaneous valve closure leading to the formation and collapse of a vapor cavity and the resultant occurrence of a short-duration pressure pulse are described. Short-duration pressure pulses result from the superposition of the valve-closure water-hammer wave and the wave generated by the collapse of the vapor cavity. The resulting maximum pressure may exceed the Joukowsky pressure generated from the initial valve closure. A series of numerical model analyses exhibiting short-duration pressure pulses are presented. In addition, experimental results supporting the findings of the numerical studies are also presented. Experimental plots of hydraulic grade line versus time exhibit short-duration pressure pulses of different shape and characteristics.enCopyright © 1991 ASCEJournal article003000033310.1061/(ASCE)0733-9429(1991)117:10(1310A1991GF751000062-s2.0-002623815664339Simpson, A. [0000-0003-1633-0111]