Abstract
The high frequency (0.1kHz) pressure and velocity measurements of two-phase unsteady flow are used to determine the hydraulic-grade-line (HGL) along the pipeline with a complex layout. The semi-empirical method is applied to estimate the pressure drop for the outflow, and thus determine the pipe downstream-end conditions for the modeling purposes. A Control- Volume (CV) model coefficient β, representing residual motion due to the pressurized water-column stratification is specified. Pressurized two-phase unsteady flow phases in a 250mm diameter and 275 meters long PVC pipeline with steel inlet and outlet counterparts are considered for the evaluation of this method.
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