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Title: Study on coalescence dynamics of unequal-sized microbubbles captive on solid substrate

Abstract

The dynamics of bubble coalescence are of importance for a number of industrial processes, in which the size inequality of the parent bubbles plays a significant role in mass transport, topological change and overall motion. In this study, coalescence of unequal-sized microbubbles captive on a solid substrate was observed from cross-section view using synchrotron high-speed imaging technique and a microfluidic gas generation device. The bridging neck growth and surface wave propagation at the early stage of coalescence were investigated by experimental and numerical methods. The results show that theoretical half-power-law of neck growth rate is still valid when viscous effect is neglected. However, the inertial-capillary time scale is associated with the initial radius of the smaller parent microbubble. Furthermore the surface wave propagation rate on the larger parent microbubble is proportional to the inertial-capillary time scale.

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [2];  [1];  [1]
  1. Indiana Univ.-Purdue Univ. Indianapolis, Indianapolis, IN (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF); USDOE
OSTI Identifier:
1482086
Alternate Identifier(s):
OSTI ID: 1496337
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Experimental Thermal and Fluid Science
Additional Journal Information:
Journal Volume: 98; Journal Issue: C; Journal ID: ISSN 0894-1777
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
bridging neck growth; bubble coalescence; high-speed x-ray imaging; microfluidic; surface wave propagation; synchrotron

Citation Formats

Zhou, Shuyi, Cao, Yuanzhi, Chen, Rou, Sun, Tao, Fezzaa, Kamel, Yu, Huidan, and Zhu, Likun. Study on coalescence dynamics of unequal-sized microbubbles captive on solid substrate. United States: N. p., 2018. Web. doi:10.1016/j.expthermflusci.2018.06.016.
Zhou, Shuyi, Cao, Yuanzhi, Chen, Rou, Sun, Tao, Fezzaa, Kamel, Yu, Huidan, & Zhu, Likun. Study on coalescence dynamics of unequal-sized microbubbles captive on solid substrate. United States. doi:10.1016/j.expthermflusci.2018.06.016.
Zhou, Shuyi, Cao, Yuanzhi, Chen, Rou, Sun, Tao, Fezzaa, Kamel, Yu, Huidan, and Zhu, Likun. Thu . "Study on coalescence dynamics of unequal-sized microbubbles captive on solid substrate". United States. doi:10.1016/j.expthermflusci.2018.06.016. https://www.osti.gov/servlets/purl/1482086.
@article{osti_1482086,
title = {Study on coalescence dynamics of unequal-sized microbubbles captive on solid substrate},
author = {Zhou, Shuyi and Cao, Yuanzhi and Chen, Rou and Sun, Tao and Fezzaa, Kamel and Yu, Huidan and Zhu, Likun},
abstractNote = {The dynamics of bubble coalescence are of importance for a number of industrial processes, in which the size inequality of the parent bubbles plays a significant role in mass transport, topological change and overall motion. In this study, coalescence of unequal-sized microbubbles captive on a solid substrate was observed from cross-section view using synchrotron high-speed imaging technique and a microfluidic gas generation device. The bridging neck growth and surface wave propagation at the early stage of coalescence were investigated by experimental and numerical methods. The results show that theoretical half-power-law of neck growth rate is still valid when viscous effect is neglected. However, the inertial-capillary time scale is associated with the initial radius of the smaller parent microbubble. Furthermore the surface wave propagation rate on the larger parent microbubble is proportional to the inertial-capillary time scale.},
doi = {10.1016/j.expthermflusci.2018.06.016},
journal = {Experimental Thermal and Fluid Science},
number = C,
volume = 98,
place = {United States},
year = {2018},
month = {6}
}