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

Kang, Chnag-Wei, Tandiono, Tandiono, Lu, Xin, Turangan, Cary K., Osman, Hafiiz, Lim, Fannon, Lucas, Margaret, and Tan, Matthew (2018) Numerical and experimental studies of collapsing captivation bubbles for ballast water treatment. In: Proceedings of the International Conference on Ocean, Offshore and Arctic Engineering (8) OMAE2018-77157. From: OMAE18: 37th International Conference on Ocean, Offshore and Arctic Engineering, June 17-22 2018, Madrid, Spain.

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Abstract

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.

Item ID: 55786
Item Type: Conference Item (Research - E1)
ISBN: 978-0-7918-5127-2
Keywords: cavitation, chemical free disinfection, aquaculture, water treatment
Copyright Information: Copyright © 2018 by ASME
Date Deposited: 06 Dec 2018 03:39
FoR Codes: 10 TECHNOLOGY > 1099 Other Technology > 109999 Technology not elsewhere classified @ 50%
09 ENGINEERING > 0907 Environmental Engineering > 090703 Environmental Technologies @ 50%
SEO Codes: 96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961104 Physical and Chemical Conditions of Water in Marine Environments @ 100%
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