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MICROFLUSA published at APS Division of Fluid Dynamics

Jan 09, 2017

A scientific publication has been published on APS Division of Fluid Dynamics 2016 as shown  in the abstract pages of Harvard: http://adsabs.harvard.edu/abs/2016APS..DFDM25006C


The publication which was prepared by TECHNION's Dr. Lishansky and Dr. Chakraborty bares the title: Microfluidic step-emulsification in a cylindrical geometry and has the following abstract:

The model microfluidic device for high-throughput droplet generation in a confined cylindrical geometry is investigated numerically. The device comprises of core-annular pressure-driven flow of two immiscible viscous liquids through a cylindrical capillary connected co-axially to a tube of a larger diameter through a sudden expansion, mimicking the microfluidic step-emulsifier (1). To study this problem, the numerical simulations of axisymmetric Navier-Stokes equations have been carried out using an interface capturing procedure based on coupled level set and volume-of-fluid (CLSVOF) methods. The accuracy of the numerical method was favorably tested vs. the predictions of the linear stability analysis of core-annular two-phase flow in a cylindrical capillary. Three distinct flow regimes can be identified: the dripping (D) instability near the entrance to the capillary, the step- (S) and the balloon- (B) emulsification at the step-like expansion. Based on the simulation results we present the phase diagram quantifying transitions between various regimes in plane of the capillary number and the flow-rate ratio.


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