A numerical study on the dynamics of droplet formation in a microfluidic double T-junction

Title
A numerical study on the dynamics of droplet formation in a microfluidic double T-junction
Author(s)
주상우응호익롱Trung-Dung Dang[Trung-Dung Dang]변찬
Keywords
LATTICE BOLTZMANN METHOD; FLOW-FOCUSING DEVICE; SURFACE-TENSION; MICROCHANNEL; SIMULATIONS; PARTICLES; VISCOSITY; MICROPARTICLES; COALESCENCE; GENERATION
Issue Date
201503
Publisher
AMER INST PHYSICS
Citation
BIOMICROFLUIDICS, v.9, no.2
Abstract
In this study, droplet formations in microfluidic double T-junctions (MFDTD) are investigated based on a two-dimensional numerical model with volume of fluid method. Parametric ranges for generating alternating droplet formation (ADF) are identified. A physical background responsible for the ADF is suggested by analyzing the dynamical stability of flow system. Since the phase discrepancy between dispersed flows is mainly caused by non-symmetrical breaking of merging droplet, merging regime becomes the alternating regime at appropriate conditions. In addition, the effects of channel geometries on droplet formation are studied in terms of relative channel width. The predicted results show that the ADF region is shifted toward lower capillary numbers when channel width ratio is less than unity. The alternating droplet size increases with the increase of channel width ratio. When this ratio reaches unity, alternating droplets can be formed at very high water fraction (wf = 0.8). The droplet formation in MFDTD depends significantly on the viscosity ratio, and the droplet size in ADF decreases with the increase of the viscosity ratio. The understanding of underlying physics of the ADF phenomenon is useful for many applications, including nanoparticle synthesis with different concentrations, hydrogel bead generation, and cell transplantation in biomedical therapy. (C) 2015 AIP Publishing LLC.
URI
http://hdl.handle.net/YU.REPOSITORY/33209http://dx.doi.org/10.1063/1.4916228
ISSN
1932-1058
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공과대학 > 기계공학부 > Articles
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