Document Type : Original Article
Professor, Mech. Eng. Dept.
Professor, Mech. Eng. Dept. Alex. University, Alex. Egypt.
Major Eng. Egyptain Air Force.
In this paper, the problem of hydraulic transients resulting from valve closure in a branched pipe carrying a two-component, two-phase flow is theoretically investigated. The governing equations were derived on the basis of one dimensional flow. The method of characteristics was used for solving the resulting differential equations. The evaluation of time interval was made in such a way to be suitable for use in a branched pipe system having branches of different lengths. The analysis of many investigated cases reveals that the maximum pressure rise increases with the increase of the delivery pipeline diameter and with the decrease of valve closure time and void fraction. Moreover the study shows that in all investigated cases, the lowest value of maximum pressure rise occurs when the piping lengths ratio C branched dead end pipe to upstream pipe lengths ) approaches unity.