Investigation of water hammer in bending stainless steel pipe under gravity flow

Author(s)

Abstract
A water hammer experimental setup consisting of a 20m long pipe having 8 U-shaped 180¬0 bends is investigated for hydraulic transient. Experimental results are then compared to numerical results simulated by the Method of Characteristics (MOC) and the Wave Characteristic Method (WCM). It is found that one-phase flow one-dimensional models of these numerical schemes are not robust enough to accurately predict the transient phenomenon taking place in such complex pipelines as in the experiment. The two-phase flow one-dimensional models: The Discrete Vapor Cavity Model (DVCM) and Discrete Gas Cavity Model (DGCM), coupled with Vardy & Brown’s unsteady friction model obtained more accurate numerical results considering the frequency and magnitude of the peak and minimum pressures of the characteristic curve. Also, these numerical results confirmed the impact of the presence of voids and gases on the wave speed as the reduction of the constant wave speed from 1000m/s in one-phase flow to 700m/s in two-phase accurately simulated the transient phenomenon in the experimental setup.

Keywords
Hydraulic transient, two-phase flow, cavitation, U-shaped bend, Pressure characteristic curve, DVCM, DGCM, WCM

Cite this paper
Yujian Ping, Akoto Emmanuel, Huli Ren, Investigation of water hammer in bending stainless steel pipe under gravity flow , SCIREA Journal of Hydraulic Engineering . Volume 5, Issue 1, February 2022 | PP. 1-18. 10.54647/hydraulic57030

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