Influence of Surface Tension on Dynamic Characteristics of Single Bubble in Free-Field Exposed to Ultrasound

Overview

Journal Micromachines (Basel)

Publisher MDPI

Date 2022 May 28

PMID 35630249

Authors

Hao Wu

Tianshu Zhang

Xiaochen Lai

Haixia Yu

Dachao Li

Hao Zheng

Hui Chen

Claus-Dieter Ohl

Yuanyuan Li

Affiliations

Soon will be listed here.

Abstract

The motion of bubbles in an ultrasonic field is a fundamental physical mechanism in most applications of acoustic cavitation. In these applications, surface-active solutes, which could lower the surface tension of the liquid, are always utilized to improve efficiency by reducing the cavitation threshold. This paper examines the influence of liquids' surface tension on single micro-bubbles motion in an ultrasonic field. A novel experimental system based on high-speed photography has been designed to investigate the temporary evolution of a single bubble in the free-field exposed to a 20.43 kHz ultrasound in liquids with different surface tensions. In addition, the R-P equations in the liquid with different surface tension are solved. It is found that the influences of the surface tension on the bubble dynamics are obvious, which reflect on the changes in the maximum size and speed of the bubble margin during bubble oscillating, as well as the weaker stability of the bubble in the liquid with low surface tension, especially for the oscillating bubble with higher speed. These effects of the surface tension on the bubble dynamics can explain the mechanism of surfactants for promoting acoustic cavitation in numerous application fields.

Citing Articles

Influence of interactions between bubbles on physico-chemical effects of acoustic cavitation.

Qin D, Lei S, Zhang B, Liu Y, Tian J, Ji X Ultrason Sonochem. 2024; 104:106808.

PMID: 38377805 PMC: 11636826. DOI: 10.1016/j.ultsonch.2024.106808.

Editorial for the Special Issue on Physics in Micro/Nano Devices: From Fundamental to Application.

Wang R, Pu Z Micromachines (Basel). 2023; 14(8).

PMID: 37630107 PMC: 10456274. DOI: 10.3390/mi14081571.

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