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This article is cited in 3 scientific papers (total in 3 papers)
Effect of junction configurations on microdroplet formation in a T-junction microchannel
F. L. Liha, J. M. Miaob a Center of General Education, R.O.C. Military Academy, Kaohsiung, 83059, Taiwan, R.O.C
b National Pingtung University of Science and Technology, Pingtung, 912301, Taiwan, R.O.C
Abstract:
This study investigates the dynamic formation process of water microdroplets in a silicon oil flow in a T-junction microchannel. Segmented water microdroplets are formed at the junction when the water flow is perpendicularly injected into the silicon oil flow in a straight rectangular microchannel. This study further presents the effects of the water flow inlet geometry on hydrodynamic characteristics of water microdroplet formation. A numerical multiphase volume of fluid (VOF) scheme is coupled to solve the unsteady three-dimensional laminar Navier–Stokes equations to depict the droplet formation phenomena at the junction. Predicted results on the length and generated frequency of the microdroplets agree well with experimental results in a T-junction microchannel with straight and flat inlets (the base model) for both fluid flows. Empirical correlations are reported between the volumetric flow ratio and the dimensionless microdroplet length or dimensionless frequency of droplet generation at a fixed capillary number of $4.7\cdot10^{-3}$. The results of this study indicate a reduction in the droplet length of approximately $21\%$ if the straight inlet for the water flow is modified to a downstream sudden contraction inlet for the water flow.
Keywords:
CFD, T-junction microchannel, VOF scheme, microdroplet, capillary number.
Received: 27.03.2013
Citation:
F. L. Lih, J. M. Miao, “Effect of junction configurations on microdroplet formation in a T-junction microchannel”, Prikl. Mekh. Tekh. Fiz., 56:2 (2015), 63–75; J. Appl. Mech. Tech. Phys., 56:2 (2015), 220–230
Linking options:
https://www.mathnet.ru/eng/pmtf965 https://www.mathnet.ru/eng/pmtf/v56/i2/p63
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