Orifice Effects on Oscillatory Flow

by Chia-Hsiung C. Tai, (A.M.ASCE), Sr. Engr.; St. Johns River Water Management Dist., Palatka, Fla.,
Yun-Sheng Yu, Prof.; Dept. of Civ. Engrg., The Univ. of Kansas, Lawrence, Kans.,

Serial Information: Journal of the Hydraulics Division, 1978, Vol. 104, Issue 4, Pg. 461-469

Document Type: Journal Paper


The resistance and added-mass effects of an orifice on the free oscillation of water in two tanks interconnected with a pipe orifice were studied at orifice-pipe diameter ratio d/D=0.25, 0.53, 0.75, and 1.0 and L/D (L=pipe length) ranging from 6.0 to 28.75. A one-dimensional method of solution which accounts for the resistance and added-mass effects was used to compute the displacement of water surface in the tank. The good agreement between the computed and measured displacement curves confirms that the one-dimensional analysis predicts accurately the nonlinear oscillation. In particular, the quasi-steady flow assumption on orifice resistance is justified and the added-mass effect can be represented by a lumped added-mass coefficient.

Subject Headings: Load and resistance factor design | Water tanks | Oscillations | Oscillatory flow | Flow resistance | Displacement (mechanics) | Water pipelines | Water surface

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