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Simulation of cavitation bubbles in a convergent–divergent nozzle water jet

Published online by Cambridge University Press:  05 February 2007

Z. QIN ,
K. BREMHORST ,
H. ALEHOSSEIN  and
T. MEYER
Z. QIN
Affiliation:
Division of Mining and Minerals Process Engineering, The University of Queensland, Brisbane, QLD, Australia, 4072 CRCMining, The University of Queensland, Brisbane, QLD, Australia, 4072
K. BREMHORST
Affiliation:
Division of Mechanical Engineering, The University of Queensland, Brisbane, QLD, Australia, 4072
H. ALEHOSSEIN
Affiliation:
CSIRO Exploration and Mining, Brisbane, Queensland 4069, Australia
T. MEYER
Affiliation:
Division of Mining and Minerals Process Engineering, The University of Queensland, Brisbane, QLD, Australia, 4072 CRCMining, The University of Queensland, Brisbane, QLD, Australia, 4072
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Abstract

A model for simulating the process of growth, collapse and rebound of a cavitation bubble travelling along the flow through a convergent–divergent nozzle producing a cavitating water jet is established. The model is based on the Rayleigh–Plesset bubble dynamics equation using as inputs ambient pressure and velocity profiles calculated with the aid of computational fluid dynamics (CFD) flow modelling. A variable time-step technique is applied to solve the highly nonlinear second-order differential equation. This technique successfully solves the Rayleigh–Plesset equation for wide ranges of pressure variation and bubble original size and saves considerable computing time. Inputs for this model are the pressure and velocity data from CFD calculation. To simulate accurately the process of bubble growth, collapse and rebound, a heat transfer model, which includes the effects of conduction plus radiation, is developed to describe the thermodynamics of the incondensable gas inside the bubble. This heat transfer model matches previously published experimental data well. Assuming that single bubble behaviour also applies to bubble clouds, the calculated distance from the nozzle exit travelled by the bubble to the point where the bubble size becomes invisible is taken to be equal to the bubble cloud length observed. The predictions are compared with experiments carried out in a cavitation cell and show good agreement for different nozzles operating at different pressure conditions.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 573 , February 2007 , pp. 1 - 25
Copyright
Copyright © Cambridge University Press 2007

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