Kang, Chang-Wei, Tandiono, Tandiono, Lu, Xin, Turangan, Cary K., Osman, Hafiiz, Lim, Fannon, Lucas, Margaret, and Tan, Matthew (2018) Numerical and experimental studies of collapsing cavitation bubbles for ballast water treatment. In: Proceedings of the International Conference on Ocean, Offshore and Arctic Engineering (7B Ocean Engineering) From: ASME 2018: 37th International Conference on Ocean, Offshore and Arctic Engineering, 17-22 June 2018, Madrid, Spain.

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Abstract

In this paper, we report both experimental and computational studies of hydrodynamic cavitation generated by accelerating liquid through a series of constrictions. The detailed process of cavitation generation is visualized using a high-speed photography. The cavitation is initiated when a gas bubble moves towards the constrictions. The gas bubble initially accelerates, expands and then splits into smaller bubbles when it moves along the constriction. As these bubbles migrate into a large liquid compartment, they collapse violently to form a bubble cloud, owing to a sudden jump in liquid pressure in the compartment. The experimental observation is further confirmed using computational fluid dynamics (CFD) simulations. We also present experimental evidence showing a significant reduction in gram-negative Escherichia coli concentration after it passes through the constrictions.

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