Issue 37, 2019

Microbubble flows in superwettable fluidic channels


The control of bubble adhesion underwater is important for various applications, yet the dynamics under flow conditions are still to be unraveled. Herein, we observed the wetting dynamics of an underwater microbubble stream in superwettable channels. The flow of microbubbles was generated by integrating a microfluidic device with an electrochemical system. The microbubble motions were visualized via tracing the flow using a high-speed camera. We show that a vortex is generated in the air layer of the superaerophilic surface under laminar conditions and that the microbubbles are transported on the superaerophilic surface under turbulent conditions driven by the dynamic motion of the air film. Furthermore, microbubbles oscillated backward and forward on the superaerophobic surface under turbulent conditions. This investigation contributes to our understanding of the principles of drag reduction through wettability control and bubble flow.

Graphical abstract: Microbubble flows in superwettable fluidic channels

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Article information

Article type
04 Jun 2019
27 Jun 2019
First published
09 Jul 2019
This article is Open Access
Creative Commons BY license

RSC Adv., 2019,9, 21220-21224

Microbubble flows in superwettable fluidic channels

M. Tenjimbayashi, K. Doi and M. Naito, RSC Adv., 2019, 9, 21220 DOI: 10.1039/C9RA04212A

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