Terry Michael. Mitchell

Cavitation Bubble Collapse Observations in a Venturi

Cavitation bubble collapse in venturi, discussing flow characteristics under large pressure gradient

On the effects of heat transfer upon collapsing bubbles

The effects upon spherically symmetric bubble collapse of the various therrodyramic parameters, including interfacial nonequilibrium boundary effects, are examined numerically for the case of cavitation or highly subcooled boiling bubbles. Pressures in the surrounding liquid as a function of time and distance are computed. It is shown that the value selected for the evaporation coefficient, not well known experimentally, has a very strong influence on collapse pressures and velocities. The thermal diffusivity of the bubble contents is also significant but somewhat less important. The effect of nonequilibum temperature or pressure discontinuities at the interface was found negligible for the cases studied. (auth)