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The International Conference on Multiphase Systems, ICMS'2000
Ufa, RUSSIA, June 15-17, 2000

Multi-Velocity Effects in Two-Phase Flow with High Pressure Gradient

Ocheretyany S. A., Prokof'ev V. V.

Department of unsteady hydrodynamics, Institute of mechanics Moscow State University, 119899, Michurinski pr. 1, Moscow, RUSSIA

The problem of multiphase liquid flow after ventilating cavity with internal pressure exceeding the ambient pressure and with low concentrations of gas (or vapor) bubbles in liquid is considered. The two-dimensional flow considered corresponds to the problem of two symmetric jets collision with a cavity formation. The velocity profile at large distances behind the cavity is determined. The most intensive disturbances in the gas-liquid mixture flow are introduced by the gas injection into liquid in the neighbourhood of the tail point of the cavity. And the injection of small gas bubbles is most efficient there. The vapor injection into a cavity is not efficient for increasing the liquid flow momentum, but it can be used for generation of a cavitating jet. The account of multi-velocity effects in the two--phase medium equations is essential for bubbles of supercritical size, when the viscous friction effect is small.