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Breakup dynamics of slender bubbles in non-newtonian fluids in microfluidic flow-focusing devices

Abstract : This study aims to investigate the breakup of slender bubbles in non-Newtonian fluids in microfluidic flow-focusing devices using a high-speed camera and a microparticle image velocimetry (micro-PIV) system. Experiments were conducted in 400- and 600-mu m square microchannels. The variation of the minimum width of gaseous thread with the remaining time before pinch-off could be scaled as a power-law relationship with an exponent less than 1/3, obtained for the pinch-off of bubbles in Newtonian fluids. The velocity field and spatial viscosity distribution in the liquid phase around the gaseous thread were determined by micro-PIV to understand the bubble breakup mechanism. A scaling law was proposed to describe the size of bubbles generated in these non-Newtonian fluids at microscale. The results revealed that the rheological properties of the continuous phase affect significantly the bubble breakup in such microdevices
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https://hal.archives-ouvertes.fr/hal-00778191
Contributor : Gabriel Wild <>
Submitted on : Friday, January 18, 2013 - 10:22:36 PM
Last modification on : Monday, March 29, 2021 - 4:06:35 PM

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Taotao Fu, Youguang Ma, Denis Funfschilling, Chunying Zhu, Huai-Zhi Li. Breakup dynamics of slender bubbles in non-newtonian fluids in microfluidic flow-focusing devices. AIChE Journal, Wiley, 2012, 58 (11), pp.3560-3567. ⟨10.1002/aic.13723⟩. ⟨hal-00778191⟩

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