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Bubble deformation and breakup in a non-uniform electric field.

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Title: Bubble deformation and breakup in a non-uniform electric field.
Authors: Wang, Junfeng1 (AUTHOR) wangjunfeng@ujs.edu.cn, Han, Jingfeng1 (AUTHOR), Wu, Tianyi1 (AUTHOR), Li, Bin1 (AUTHOR), Yu, Kai1 (AUTHOR), Xu, Haojie1 (AUTHOR), Zhang, Wei1 (AUTHOR) zhangwei0112@ujs.edu.cn
Source: Chemical Engineering Science. Apr2024, Vol. 287, pN.PAG-N.PAG. 1p.
Subjects: Microbubbles, Interface stability, Gas flow, Gas-liquid interfaces, High-speed photography
Abstract: • Four bubble breakup regimes were observed under the electric field. • Mixing limited leaky-dielectric into a dielectric greatly enhances the electrodispersion of bubbles. • Electric field effect on bubble deformation and breakup is more pronounced at low gas flow rates. • A wide bubble size distribution can be obtained by controlling the electric field and gas flow rate. In this paper, the deformation and breakup characteristics of bubbles during their growth in a mixture solution were studied with a needle-ring electrode configuration in the presence of an electric field by using high-speed photography. Four distinct bubble breakup behaviors of the dripping, cone, kink and branch regimes were achieved successfully by manipulating the electric field. By considering the applied voltage and gas flow rate, the cone structure, interface stability, departure frequency and bubble size distribution in different regimes were quantitatively discussed. It is found that the cone height, interface curvature, departure frequency and bubble size distribution are evidently associated with bubble breakup regimes. As the electric field strength increased, the bubbles stretched in the direction of the electric field and the instability of the gas–liquid interface became stronger, which eventually resulted in the bubbles fragmenting into a cluster of microbubbles. This work provides a fundamental understanding of bubble deformation and breakup mechanisms under the electric field. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:• Four bubble breakup regimes were observed under the electric field. • Mixing limited leaky-dielectric into a dielectric greatly enhances the electrodispersion of bubbles. • Electric field effect on bubble deformation and breakup is more pronounced at low gas flow rates. • A wide bubble size distribution can be obtained by controlling the electric field and gas flow rate. In this paper, the deformation and breakup characteristics of bubbles during their growth in a mixture solution were studied with a needle-ring electrode configuration in the presence of an electric field by using high-speed photography. Four distinct bubble breakup behaviors of the dripping, cone, kink and branch regimes were achieved successfully by manipulating the electric field. By considering the applied voltage and gas flow rate, the cone structure, interface stability, departure frequency and bubble size distribution in different regimes were quantitatively discussed. It is found that the cone height, interface curvature, departure frequency and bubble size distribution are evidently associated with bubble breakup regimes. As the electric field strength increased, the bubbles stretched in the direction of the electric field and the instability of the gas–liquid interface became stronger, which eventually resulted in the bubbles fragmenting into a cluster of microbubbles. This work provides a fundamental understanding of bubble deformation and breakup mechanisms under the electric field. [ABSTRACT FROM AUTHOR]
ISSN:00092509
DOI:10.1016/j.ces.2024.119741