The interaction of closely spaced microbubbles (MBs) exposed to a transient external pressure field is relevant for a variety of industrial and medical applications. We present a computational framework employing an interface tracking approach to model the transient dynamics of multiple, interacting, insonated MBs in arbitrary settings. In particular, this technique allows studying the effects of mutual proximity, confinement, and variations in excitation amplitude on the translatory motion of pairs of differently sized MBs. Domains of mutual repulsion or attraction are observed for closely spaced MBs in the investigated range of excitation frequencies. The repulsion domain widens and shifts to lower frequencies with increasing excitation pressure amplitude. When the MBs are confined in rigid tubes of decreasing diameters, we observe a shift of the translatory patterns towards lower frequencies, accompanied by a change in relative strength of the two translation modes. This effect is correlated to a decrease of the resonance frequency due to confinement which causes changes in oscillation amplitude and phase shift between the bubble vibrations. Coupling to the viscous host liquid gives rise to phenomena such as collective MB drift, non-symmetric attraction or repulsion, and reversal of translation direction. A system comprising six MBs inside a narrow tube highlights the potential of the computational framework to treat complex setups with multiple bubbles.
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June 2014
Research Article|
June 20 2014
Modeling the interaction of microbubbles: Effects of proximity, confinement, and excitation amplitude
W. Wiedemair;
W. Wiedemair
1
Laboratory of Thermodynamics in Emerging Technologies
, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092 Zurich, Switzerland
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Z. Tukovic;
Z. Tukovic
2Faculty of Mechanical Engineering and Naval Architecture,
University of Zagreb
, Ivana Lucica 5, 10000 Zagreb, Croatia
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H. Jasak;
H. Jasak
2Faculty of Mechanical Engineering and Naval Architecture,
University of Zagreb
, Ivana Lucica 5, 10000 Zagreb, Croatia
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D. Poulikakos;
D. Poulikakos
a)
1
Laboratory of Thermodynamics in Emerging Technologies
, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092 Zurich, Switzerland
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V. Kurtcuoglu
V. Kurtcuoglu
a)
3The Interface Group, Institute of Physiology,
University of Zurich
, Winterthurerstrasse 190, 8057 Zurich, Switzerland
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a)
Authors to whom correspondence should be addressed. Electronic addresses: [email protected] and [email protected]
Physics of Fluids 26, 062106 (2014)
Article history
Received:
September 09 2013
Accepted:
June 03 2014
Citation
W. Wiedemair, Z. Tukovic, H. Jasak, D. Poulikakos, V. Kurtcuoglu; Modeling the interaction of microbubbles: Effects of proximity, confinement, and excitation amplitude. Physics of Fluids 1 June 2014; 26 (6): 062106. https://doi.org/10.1063/1.4883482
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