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Published on: February 4, 2011
Segregation by size difference in binary suspensions of fluid droplets in channel flow
Masato Makino1, Masako Sugihara-Seki
1Faculty of Engineering Science, Kansai University, Osaka, Japan.
Biorheology
|July 19, 2013
Summary
In channel flow, larger droplets migrate toward the center, while smaller droplets move toward the walls. This size-driven segregation in binary dispersed suspensions is enhanced by increasing droplet size difference and large droplet concentration.
Area of Science:
- Fluid Dynamics
- Multiphase Flow
- Colloid Science
Background:
- Component segregation in channel flow arises from differential lateral migration.
- Droplet size, shape, and flexibility influence migration behavior.
Purpose of the Study:
- Investigate the impact of droplet size differences on segregation in channel flow.
- Analyze lateral migration of binary dispersed fluid droplets in a Poiseuille flow.
Main Methods:
- Two-dimensional numerical simulation of binary dispersed suspensions.
- Computed time evolution of lateral droplet positions relative to channel centerline.
- Varied area fraction of small droplets with constant total area fraction.
Main Results:
- Large droplets migrated towards the channel centerline.
- Small droplets migrated towards the channel walls.
- Segregation and small droplet margination intensified with increased size difference and large droplet area fraction.
Conclusions:
- Droplet size significantly dictates lateral migration and segregation in channel flow.
- Larger droplets' tendency to approach the centerline expels smaller droplets towards the walls.
- Findings offer insights into controlling particle distribution in multiphase flows.
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