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http://dx.doi.org/10.7316/KHNES.2018.29.4.370

Numerical Evaluation of Flow Nature at the Downstream of a Ball Valve Used for Gas Pipelines with Valve Opening Rates  

KIM, CHUL-KYU (Korea Institute of Civil Engineering and Building Technology)
LEE, SANG-MOON (Korea Institute of Civil Engineering and Building Technology)
JANG, CHOON-MAN (Korea Institute of Civil Engineering and Building Technology)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.29, no.4, 2018 , pp. 370-377 More about this Journal
Abstract
Ball valve has been widely used in the field of high-pressure gas pipeline as an important component because of its low flow resistance and good leakage performance. The present paper focuses on the flow nature at the downstream of the ball valve used for gas pipelines according to valve opening rates. Steady 3-D RANS equations, SC/Tetra, have been introduced to analyze the flow characteristics inside the ball valve. Numerical boundary conditions at the inlet and outlet of the valve system are imposed by mass flow-rate and pressure, respectively. Velocity distributions obtained by numerical simulation are compared with respect to the valve opening rates of 30, 50, and 70%. Cavity distributions, asymmetry flow velocity and the flow stabilization point at each opening rate are also compared. When the valve opening rates are 30 and 50%, the flow stabilization requires the sufficient length of 10D or more due to the influence of the recirculation flow at the downstream of the valve.
Keywords
Ball valve; Gas pipeline; Flow nature; Asymmetry flow; Recirculation flow;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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