Collapse of Cavitation Gas Bubbles in Giesekus Liquids

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  • Kafiabad H. Amini
    University of Tehran, College of Engineering, Department of Mechanical Engineering
  • Sadeghy K.
    University of Tehran, College of Engineering, Department of Mechanical Engineering

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In the present work, the collapse of a spherical gas bubble immersed in a Giesekus liquid and subjected to a sudden pressure jump is studied numerically. The main objective of the work is to investigate the role played by the extensional-flow resistance of the surrounding liquid on the bubble dynamics during its collapse. Converged results could be obtained using Gauss-Laguerre quadrature method at very high Deborah and Reynolds numbers over prolonged times. The results show that the extensional-flow behavior of the surrounding liquid, as represented by the mobility factor, has indeed a strong effect on the bubble dynamics. A decrease in the degree of the strain-hardening behavior of the surrounding liquid is predicted to accelerate bubble collapse but only at the early stages of the collapse. At large times, however, it is predicted to have a retarding effect on the bubble collapse. It is also predicted that free oscillations may not exhibit themselves in viscoelastic fluids if the pressure surge is exerted gradually.

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