Direct numerical simulations have been conducted for chaotic mixing inside an immiscible droplet moving through a winding channel or tube in order to clarify the detailed mechanism of the enhancement of mixing, which is useful for the design of efficient micro devices. An immersed-boundary method is used for simulating the flow inside the bending channel, while the PLIC-VOF algorithm is used for tracking the droplet interface. The molecular mixing is ignored and only the mixing due to the chaotic advection is considered by using passive tracer particles. By considering the relation between the flow structure and the mixing inside the droplet in two-dimensional computations, it is found that the quality of mixing strongly depends on the activity of the dipole structure of the flow inside the droplet, and that the activity depends on various parameters including the dimension and the shape of the winding channel. In a winding channel with a locally narrowed region, for example, circulating flows associated with the dipole are off-centered to reduce the efficiency of mixing. A three-dimensional computation shows that the quality of mixing is decreased in the edge regions of the droplet.
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ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
July 24–29, 2011
Hamamatsu, Japan
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4440-3
PROCEEDINGS PAPER
Numerical Study of Mixing in a Droplet Moving Through a Winding Channel
Mitsuru Tanaka,
Mitsuru Tanaka
Kyoto Institute of Technology, Kyoto, Japan
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Yo Miyajima,
Yo Miyajima
Mitsubishi Heavy Industries, Tokyo, Japan
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Jun Mizutani
Jun Mizutani
Kyoto Institute of Technology, Kyoto, Japan
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Mitsuru Tanaka
Kyoto Institute of Technology, Kyoto, Japan
Yo Miyajima
Mitsubishi Heavy Industries, Tokyo, Japan
Jun Mizutani
Kyoto Institute of Technology, Kyoto, Japan
Paper No:
AJK2011-21018, pp. 3801-3812; 12 pages
Published Online:
May 25, 2012
Citation
Tanaka, M, Miyajima, Y, & Mizutani, J. "Numerical Study of Mixing in a Droplet Moving Through a Winding Channel." Proceedings of the ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D. Hamamatsu, Japan. July 24–29, 2011. pp. 3801-3812. ASME. https://doi.org/10.1115/AJK2011-21018
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