LOCAL ENERGY LOSS OF THE TRANSITION OF FULL PIPE FLOW TO PARTIALLY FULL FLOW AND VICE VERSA IN A CIRCULAR PIPE

Abstract

In order to determine whether the local energy loss of the transition of full pipe flow to free surface flow and vice versa should be involved or not in the calculation of the urban storm water collection network, experiments on the flow in a circular pipe with transition were performed under a steady and subcritical flow condition.
Comparisons of the observed water depth and computed results, and estimated friction factor of the transition showed that neglecting this energy loss might not introduce a significant error.