Effects of the geometrical configuration of air–water mixer on the size and distribution of microbubbles in aeration systems

Basso, Alessio and Hamad, F.A. and Ganesan, Poo Balan (2018) Effects of the geometrical configuration of air–water mixer on the size and distribution of microbubbles in aeration systems. Asia-Pacific Journal of Chemical Engineering, 13 (6). e2259. ISSN 1932-2135

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Official URL: https://doi.org/10.1002/apj.2259

Abstract

The objective of this work is to present a novel geometrical configuration for microbubble generators (MBGs) to improve dissolved-oxygen levels in water. Among various methodologies from the literature, Orifice and Venturi tubes have been considered as baseline cases. Experimental data from the literature are used to verify a computational fluid dynamics (CFD) case developed for a better understanding of the dynamics of MBGs. As a result, the validated CFD setup has been implemented on a modified Venturi-type generator, where air is injected coaxially with respect to the tube axis, whereas a helicoid wall at variable pitch angle is used. Results show a reduction in the mean bubble diameter distribution from the baseline Venturi tubes, particularly, at low-speed inlet velocities. This is of interest, especially to decrease the energy requirement for most common water aeration systems.

Item Type: Article
Uncontrolled Keywords: CFD simulation; dissolved oxygen in water; microbubble generator; swirling flow
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 13 Sep 2019 06:18
Last Modified: 13 Sep 2019 06:18
URI: http://eprints.um.edu.my/id/eprint/22336

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