Pinch-off mechanism for Taylor bubble formation in a microfluidic flow-focusing device

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• 作者：Yutao Lu (1)
  Taotao Fu (1)
  Chunying Zhu (1)
  Youguang Ma (1)
  Huai Z. Li (2)
  
• 关键词：Microfluidics ; Multiphase flow ; Nonlinear dynamics ; Interface ; Confinement ; Pinch ; off
• 刊名：Microfluidics and Nanofluidics
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：16
• 期：6
• 页码：1047-1055
• 全文大小：1,417 KB
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• 作者单位：Yutao Lu (1)
  Taotao Fu (1)
  Chunying Zhu (1)
  Youguang Ma (1)
  Huai Z. Li (2)
  
  1. State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
  2. Laboratory of Reactions and Process Engineering, University of Lorraine, CNRS, 1, rue Grandville, BP 20451, 54001, Nancy Cedex, France
  
• ISSN：1613-4990

文摘

The present work aims at studying the nonlinear breakup mechanism for Taylor bubble formation in a microfluidic flow-focusing device by using a high-speed digital camera. Experiments were carried out in a square microchannel with cross section of 600?×?600?μm. During the nonlinear collapse process, the variation of the minimum radius of bubble neck (r 0) with the remaining time until pinch-off (τ) can be scaled by a power–law relationship: \(r_{0} \propto \tau^{\alpha } .\) Due to the interface rearrangement around the neck, the nonlinear collapse process can be divided into two distinct stages: liquid squeezing collapse stage and free pinch-off stage. In the liquid squeezing collapse stage, the neck collapses under the constriction of the liquid flow and the exponent α approaches to 0.33 with the increase in the liquid flow rate Q l. In the free pinch-off stage, the value of α is close to the theoretical value of 0.50 derived from the Rayleigh–Plesset equation and is independent of Q l.