Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session G07: Microchannel Flows
10:35 AM–12:45 PM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B212
Chair: Xiangchun Xuan, Clemson University
Abstract ID: BAPS.2018.DFD.G07.1
Abstract: G07.00001 : Flow recirculation in microfluidic T-junctions and bends*
10:35 AM–10:48 AM
Presenter:
San To Chan
(Okinawa Institute of Science and Technology)
Authors:
San To Chan
(Okinawa Institute of Science and Technology)
Simon J Haward
(Okinawa Institute of Science and Technology)
Amy Q Shen
(Okinawa Institute of Science and Technology)
Flow recirculation occurs in the outlets of a dividing T-junction of square cross-section when the inlet Reynolds number Re exceeds a critical value Rec ≈ 350 [1]. The recirculation zones can trap particles, which has important implications to the physics and engineering of inertial microfluidics. We investigate such flow phenomenon using novel glass microfluidic T-junction devices [2]. First, by micro-particle image velocimetry, we show the formation of two counter-rotating Dean vortices in the channel cross-section. Then, by a method that enables high-contrast imaging of recirculating streamlines, we visualize the complete structure of the recirculation zone for Re > Rec. By varying the ratio of flowrate in the two outlets, we effectively decouple the swirl from the rate of vorticity decay. We demonstrate that even slight outflow imbalances can significantly alter both Rec and the structure of the recirculation zones. Finally, we show that similar flow recirculation also occurs in sharp microfluidic bends.
1. Ault J T et al. (2016) Phys Rev Lett 117: 084501
2. Chan S T et al. (2018) Phys Rev Fluids 3: 072201(R)
*We are grateful for the support of Okinawa Institute of Science and Technology Graduate University, with subsidy funding from the Cabinet Office, Government of Japan.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.G07.1
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