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http://dx.doi.org/10.1016/j.ijnaoe.2021.06.007

Bubble formation in globe valve and flow characteristics of partially filled pipe water flow  

Nguyen, Quang Khai (Department of Naval Architecture and Ocean Engineering, Pusan National University)
Jung, Kwang Hyo (Department of Naval Architecture and Ocean Engineering, Pusan National University)
Lee, Gang Nam (Department of Naval Architecture and Ocean Engineering, Pusan National University)
Park, Hyun Jung (Department of Naval Architecture and Ocean Engineering, Pusan National University)
To, Peter (College of Science & Engineering, James Cook University)
Suh, Sung Bu (Department of Naval Architecture and Ocean Engineering, Dong-Eui University)
Lee, Jaeyong (Department of Naval Architecture and Ocean Engineering, Dong-Eui University)
Publication Information
International Journal of Naval Architecture and Ocean Engineering / v.13, no.1, 2021 , pp. 554-565 More about this Journal
Abstract
Air bubble entrainment is a phenomenon that can significantly reduce the efficiency of liquid motion in piping systems. In the present study, the bubble formation mechanism in a globe valve with 90% water fraction flow is explained by visualization study and pressure oscillation analysis. The shadowgraph imaging technique is applied to illustrate the unsteady flow inside the transparent valve. This helps to study the effect of bubbles induced by the globe valve on pressure distribution and valve flow coefficient. International Society of Automation (ISA) recommends locations for measuring pressure drop of the valve to determine its flow coefficient. This paper presents the comparison of the pressures at different locations along with the upstream and the downstream of the valve with the values at recommended positions by the ISA standard. The results show that in partially filled pipe flow, the discrepancies in pressure between different measurement locations in the valve downstream are significant at valve openings less than 30%. The aerated flow induces the oscillation in pressure and flow rate, which leads to the fluctuation in the flow coefficient of the valve. The flow coefficients have a linear relationship with the Reynolds number. For the same increase of Reynolds number, the flow coefficients grow faster with larger valve openings and level off at the opening of 50%.
Keywords
Globe valve; Flow coefficient; Water fraction; Pressure fluctuation; Bubble formation; Aerated flow;
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