Bubble formation and breakup dynamics in highly viscous fluids in a microfluidic flow-focusing device

Fu Taotao; Ma Youguang

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Bubble formation and breakup dynamics in highly viscous fluids in a microfluidic flow-focusing device

Fu Taotao * #,Ma Youguang

State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China

*Correspondence author

#Submitted by

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Funding: National Natural Science Foundation of China （No.21276175, 21106093）, Research Fund for the Doctoral Program of Higher Education （No.20110032120010）, Opening Project of State Key Laboratory of Chemical Engineering （No.SKL-ChE-13T04）, Tianjin Natural Science Foundation （No.13JCQNJC05500）

Opened online:27 November 2014

Accepted by: none

Citation: Fu Taotao,Ma Youguang.Bubble formation and breakup dynamics in highly viscous fluids in a microfluidic flow-focusing device[OL]. [27 November 2014] http://en.paper.edu.cn/en_releasepaper/content/4619269

Bubbles are always encountered in multiphase microfluidics and have potential applications in chemical engineering, energy utilization, and biochemical engineering. This article reports breakup dynamics for bubble formation in a viscous liquid in a microfluidic device by using a high speed camera. The bubbles are generated at the cross-junction of the flow-focusing device, and all of the microchannels in the device are square with 400 μm in width. The bubble formation process can be devided into the retraction stage, the expansion stage, the collapse stage and the final breakup stage. The volume of the gaseous thread propagates linearly with time with a greater speed after 20ms. The thinning of the gaseous thread experiences two distinct period: one is nonlinear and the other one is linear. The variation of the minimum width of the gaseous neck with the remaining time before the final breakup can be scaled as a power-law relation with an exponent 0.5238, when the minimum width of the gaseous neck is larger than 20μm. While the breakup of the long and slender gaseous thread with its width less than 20μm is controlled by the surface tension and the exterior viscous forces, and the gaseous neck thins linearly with time with a contant radial velocity close to the theoretical value of σ/(2μl).

Keywords:Microfluidics; Bubble; Breakup; Pinch-off; viscous fluids

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