The International Conference on Multiphase Systems, ICMS'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.