Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session N09: Emerging Trends in Soft Microscale Mechanics II
11:30 AM–2:30 PM,
Wednesday, March 8, 2023
Room: Room 132
Sponsoring
Unit:
DSOFT
Chair: Megan Valentine, University of California, Santa Barbara
Abstract: N09.00006 : Active mixing with Quincke rollers
12:30 PM–12:42 PM
Presenter:
Cécile Clavaud
(IST Austria)
Authors:
Cécile Clavaud
(IST Austria)
Isaac Lenton
(IST Austria)
Scott Waitukaitis
(IST Austria)
In this talk, I describe our efforts to mix fluids with a model active matter: Quincke rollers. They are micron sized insulating spheres that, when immersed in a conductive fluid and subjected to an external electric field, spontaneously rotate. Since they are settled on the bottom of a microfluidic cell, this rotation converts into a translation that can reach speeds of about 1 mm/s.
We are building an experimental system that will allow us to track the Quincke rollers while simultaneously characterizing the fluid mixing. By first characterizing the effect of a single roller as it stretches the fluid, then considering the system as a whole, we hope to show that the mixing dynamics are greatly enhanced by the particles movement. An order of magnitude calculation shows that the Quincke rollers could divide the mixing time by at least 200 when compared to a purely diffusive case.
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