An experimental study of gas nuclei-assisted hydrodynamic cavitation for aquaculture water treatment

Tandiono, Tandiono, Kang, Chang Wei, Lu, Xin, Turangan, Cary K., Tan, Matthew, Bin Osman, Hafiiz, and Lim, Fannon (2020) An experimental study of gas nuclei-assisted hydrodynamic cavitation for aquaculture water treatment. Journal of Visualization. (In Press)

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Abstract

We present an experimental study on hydrodynamic cavitation generated by accelerating liquid through a series of constrictions in the presence of gas bubbles and explore its possible applications in water treatment with particular example in aquaculture industry. The formation of intense cavitation bubbles is visualized using a high-speed photography. The cavitation is initiated when a gas bubble moves towards a narrow cylindrical constriction where it accelerates, expands and then splits into smaller bubbles owing to the sharp pressure gradient of the liquid flow inside the constriction section. As the bubbles emerge downstream from the constrictions, they are exposed to a higher pressure region and collapse violently forming a cloud of bubbles. Smaller and more dispersed bubbles are produced by further passing the bubbles through a second series of constrictions. By introducing gas bubbles that serve as cavitation nuclei prior to the constriction, it is unnecessary to force the liquid flow below its vapor pressure to produce intense cavitation, thus enhancing the cavitation activities. We also present experimental evidences of a significant reduction of gram-negative Escherichia coli concentration after exposing them to the cavitation bubbles. Yet, the cavitation bubbles are found to be not sufficiently strong to lyse endospores Bacillus subtilis that are widely used in aquacultures.

Item ID: 63731
Item Type: Article (Research - C1)
ISSN: 1875-8975
Keywords: Hydrodynamic cavitation; Bubble; Disinfectant; High-speed visualization
Copyright Information: © The Visualization Society of Japan 2020
Date Deposited: 07 Aug 2020 04:23
FoR Codes: 51 PHYSICAL SCIENCES > 5199 Other physical sciences > 519999 Other physical sciences not elsewhere classified @ 50%
40 ENGINEERING > 4011 Environmental engineering > 401106 Waste management, reduction, reuse and recycling @ 20%
30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3005 Fisheries sciences > 300501 Aquaculture @ 30%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830199 Fisheries - Aquaculture not elsewhere classified @ 30%
97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 70%
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