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Numerical Analysis on the Determination of Head Loss by Perforated Vertical Walls  

Chun, In-Sik (Department of Civil Engineering, Konkuk University)
Lee, Seong-Yeop (Department of Civil Engineering, Konkuk University)
Park, Kyung-Soo (Civil & Environmental Tech. Research Team, Research & Engineering Div., POSCO Engineering & Construction Co., Ltd.)
An, Dong-Keun (Civil & Environmental Tech. Research Team, Research & Engineering Div., POSCO Engineering & Construction Co., Ltd.)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.19, no.3, 2007 , pp. 194-204 More about this Journal
Abstract
A numerical analysis and hydraulic experiments were undertaken to investigate the head loss occurring when a flow passes through vertical perforated walls. The numerical analysis applied continuity, momentum and energy equations to the control volumes that were set near the perforated wall. Non-dimensional equations were then derived to calculate both upstream depth and head loss for the given values of downstream depth and velocity. The hydraulic experiments were performed with several single and triple perforated plates varying their opening ratios and intervals. The numerical results with the single plates were compared with the experimental results, and it was shown that the contraction coefficient of the vertical line jet formed after the perforated plates relies on downstream Froude number as well as opening ratio. Based on the experimental results, empirical formulas were formulated. Finally, the formulas were applied to the triple plates sequentially from downstream side to upstream side, and it was found that in general the predicted values nicely agreed with the experimental results.
Keywords
vertical perforated wall; head loss; Froude number; line jet; opening ratio; orifice; contraction coefficient;
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