Abstract
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.
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