Numerical Simulation of Jetting Instability in Flow Focusing Microfluidics

Hong Bo Zhang; Jian Pu Liu; Huan Xin Lai

doi:10.4028/www.scientific.net/KEM.609-610.630

Paper Titles

Effect of Joule Heat on Hydrophily of Microchannel
p.606

Nucleation and Growth Characteristics of Bubble in Subcooled Flow Boiling in Microchannel
p.611

Effects of Wall Slip on Filling Flow for Polymer Melt in Micro Injection Molding
p.617

Research of Magnetic Fluid under the Orthogonal Stationary Magnetic Field
p.623

Numerical Simulation of Jetting Instability in Flow Focusing Microfluidics
p.630

Improving the Current Stability through the Bubbles-Free Microfluidic Electro-Spray Ionizing Chip
p.637

A Microfluidic-Based Trapping and Positioning Method for Single Cells
p.642

The Tunable Optofluidics Waveguide Design Based on the Novel Dual Side-Coupled Cavities Plasmonic Structure
p.648

Organic Solvent Fumigation Bonding for Multi-Layer Poly(methyl Methacrylate) Microfluidic Device
p.654

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Numerical Simulation of Jetting Instability in Flow Focusing Microfluidics

Abstract:

In this paper, jetting behavior of two immiscible liquids, water as the outer liquid and silicone oil as the inner liquid in typical flow focusing microchannels were numerically studied using VOF method. At low capillary number, uniform microdroplets were obtained by the absolute instability. With the increasing of fluid flow ratio, the jet is thinner and tends to break up further away the cross junction. The results showed that the flow rate ratio is the main factor that influences the microdroplet sizes, while the frequency of microdroplets formation can be controlled mainly by the surface tension when it is in the jetting regime.