Numerical and experimental studies of collapsing captivation bubbles for ballast water treatment

In this paper, we report on both experimental and computational studies of hydrodynamic cavitation generated by accelerating liquid through a series of constrictions. The detail process of cavitation generation is visualized using a high-speed photography. The cavitation is initiated when a gas bubble is moving towards the constriction. The gas bubble accelerates, expands and splits into a few smaller bubbles when moving along the constriction. As they are released into a large liquid compartment, the bubbles collapse violently to form a bubble cloud due to a sudden jump of pressure in the compartment. The result is further confirmed using computational fluid dynamics (CFD) simulations. Lastly, we present experimental evidences showing a significant reduction of gram-negative Escherichia coli concentration after passing through the constrictions.

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OMAE18: 37th International Conference on Ocean, Offshore and Arctic Engineering

8

978-0-7918-5127-2

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