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

Journal Article · · Experimental Thermal and Fluid Science
 [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)
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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.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1482086
Alternate ID(s):
OSTI ID: 1496337
Journal Information:
Experimental Thermal and Fluid Science, Journal Name: Experimental Thermal and Fluid Science Journal Issue: C Vol. 98; ISSN 0894-1777
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

Figures / Tables (8)

Fig. 1(p. 6)figure Fig. 1
Fig. 2(p. 9)figure Fig. 2
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Fig. 6(p. 14)figure Fig. 6
Fig. 7(p. 16)figure Fig. 7
Fig. 8(p. 18)figure Fig. 8

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Related Subjects

42 ENGINEERING
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
bridging neck growth
bubble coalescence
high-speed x-ray imaging
microfluidic
surface wave propagation
synchrotron