화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.37, No.12, 2117-2123, December, 2020
DOI10.1007/s11814-020-0656-5  Export Citation
Direct numerical simulation of microbubble streaming in a microfluidic device: The effect of the bubble protrusion depth on the vortex pattern
Behrouz Behdani1, 2, Saman Monjezi1, Jie Zhang3, Cheng Wang3, †, and Joontaek Park1, 4, †
  • 1The Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
  • 2The Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN 37212, USA
  • 3The Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
  • 4The Biomedical, Biological and Chemical Engineering Department, University of Missouri, Columbia, MO 65211, USA
E-mail:,
Microbubble streaming in a microfluidic device has been increasingly studied and used in recent years, due to its unique flow pattern that can promote mixing, sort particles and trap particles in microscale flows. However, there have been few numerical studies of this subject. We performed a 3D direct simulation of a cylindrical-shaped microbubble, trapped in a pit of a microchannel and sandwiched between two parallel plates, vibrated by pressure oscillation. Our simulation was able to reproduce the experimentally observed relation between the bubble protrusion depth and the vortex pattern: As the bubble protrusion depth increased, new vortices emerged and grew larger. Our investigation of the streamlines near the bubble interface indicates that the number of non-spherical nodes in the bubble interface is closely related to the flow pattern in the liquid phase. It was also validated by our simulation that the flow velocity showed an exponentially decaying trend as the radial distance outward from the vortex center. Our numerical model was also used to investigate the effects of surface tension and channel size on the vortex pattern. Larger surface tension or smaller channel size showed a similar effect as the increased protrusion depth induced more vortices.
Keywords:Acoustic Bubble Streaming;Oscillating Bubble;Microfluidics;Numerical Modeling;Multiphase Flow
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