Etude theorique et experimentale de la reponse d'une petite bulle de gaz (germe de cavitation) a la reduction de pression ambiante

The present paper gives a mathematical model for collapse and ignition of reactive gas-filled bubbles. Oxyhydrogen bubbles, which can be formed in high-temperalure reactor water, can present an explosion hazard. In addition to treating the classical features of bubble dynamics, energy balances for the liquid and gas phase, and the heat transfer between the gas and surrounding liquid are included in the model. The gas-phase thermodynamic properties and chemical reaction rates are assembled by incorporating a real-gas version of the CHEMKJN chemical kinetics package in which the Nobel-Abel equation of state is used. The liquid energy equation is solved by the integral method to yield an ordinary differential equation for interface temperature. Some typical numerical results and shock ignition thresholds, or critical shock pressures necessary to ignite the gas-phase mixture, under various conditions for argon-diluted hydrogen/oxygen bubbles in water and glycerin are presented. Comparison with experi...

Contribution of homogeneous condensation inside cavitation nuclei to cavitation inception.

Shock Initiation of Hydrogen/Oxygen/Argon Bubbles in a Nonreactive Liquid

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Entwicklung und Erprobung eines Verfahrens zur Detektion von kavitationsinduzierenden Keimen in hydraulischen Versuchsanlagen

A model for the effect of two-phase liquid on pump seals is developed based on vortex bursts near the surface of lip seals and the generation of sound waves in the liquid. It is experimentally found that these waves can destroy the contact surfaces of lip seals if the frequency of vortex bursts reaches the frequency of natural transverse acoustic oscillations.

Investigation of the destructive effect of two-phase liquid on screw pump lip seals

Flow of Cavitation Bubbles in a Centrifugal Pump Impeller

The dynamics of cavity bubbles both in a liquid of infinite extent and near a rigid boundary is studied. A technique is developed for mathematical modelling of bubble dynamics. In the mathematical modellings heat transfer between the bubble contents and the surrounding liquid, evaporation and condensation and the buoyancy forces are considered. The bubbles could be vapour bubbles (filled with vapour), gas bubbles (filled with a non-condensable gas) or bubbles filled with a mixture of vapour and a non-condensable gas. The properties of vapour are extracted from thermodynamic tables and those of the non-condensable gas are related by the equation of state of an ideal gas. The surrounding liquid is assumed to be invicid and incompressible and the flow field irrotational. For isolated bubbles the flow field is simulated by the flow field of a sink or a source and for bubbles near a rigid surface the boundary element method is utilised for the solution of the flow field. Three sets of differential equations have been derived for three types of the above mentioned bubbles. These sets of differential equations are solved by the Runge-Kutta method. A dual reciprocity boundary element method is adopted and modified to solve the equation of energy in the liquid domain thereby heat transfer across the bubble-liquid interface is determined. The method, while retaining accuracy,

result

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Contribution of homogeneous condensation inside cavitation nuclei to cavitation inception.

Citations

Shock Initiation of Hydrogen/Oxygen/Argon Bubbles in a Nonreactive Liquid

Entwicklung und Erprobung eines Verfahrens zur Detektion von kavitationsinduzierenden Keimen in hydraulischen Versuchsanlagen

Investigation of the destructive effect of two-phase liquid on screw pump lip seals

Flow of Cavitation Bubbles in a Centrifugal Pump Impeller

The effects of heat transfer on vapour, gas and vapour-gas cavity bubbles

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Contribution of Homogeneous Condensation Inside Cavitation Nuclei to Cavitation Inception

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