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Study on high-viscosity bubble breakup dynamics in Y-shaped microchannel integrating sudden contraction and Murray's law
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DOI：10.1002/aic.70506.png)
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Abstract
En 中文
Micro-reaction technology introduces bubbles to intensify mixing in high-viscosity systems, but traditional distributors lack sufficient squeezing and shearing forces. Consequently, designing novel microchannel structures is needed. This study proposes a Y-shaped microchannel integrating Murray's law and sudden contraction structures, investigating bubble breakup dynamics in high-viscosity continuous phases. Results show Murray's law channels ensure stable flow distribution, while sudden contraction structures stretch bubbles past critical dimensionless length (lcrit/Wm ≈1.40). Their synergy broadens the operating boundary, achieving highly symmetric and monodisperse bubble distribution. Kinetic analysis reveals high viscosity causes intense viscous dissipation, retarding neck film drainage and suppressing final-stage breakup instability. As the Ohnesorge number increases, the breakup mechanism transitions from inertia-dominated to viscosity-dominated. A semi-empirical prediction model for bubble size was established, incorporating gas–liquid flow rate ratio, Capillary, and Ohnesorge numbers (error within ±15%), providing a theoretical basis for numbering-up high-viscosity multiphase micro-chemical systems.
Keywords:
bubble breakup dynamics
high viscosity
microchannel
Murray's law
sudden contraction
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4
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1.1W
Citations:
2.9W
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