Dynamics of droplet formation at T-shaped nozzles with elastic feed lines

被引:0
|
作者
Daniéll Malsch
Nils Gleichmann
Mark Kielpinski
Günter Mayer
Thomas Henkel
Dirk Mueller
Volkert van Steijn
Chris R. Kleijn
Michiel T. Kreutzer
机构
[1] Institute of Photonic Technology (IPHT),Microfluidics Department
[2] Institute of Photonic Technology (IPHT),Department of Laser Diagnostics
[3] Delft University of Technology,Faculty of Applied Sciences, J.M. Burgers Centre for Fluid Mechanics
来源
Microfluidics and Nanofluidics | 2010年 / 8卷
关键词
Segmented flow; Droplet formation; Micro particle image velocimetry (μPIV); Micro channel; Oil/water two phase flow; Digital reaction technology; Droplet-based microfluidics platform;
D O I
暂无
中图分类号
学科分类号
摘要
We describe the formation of water in oil droplets, which are commonly used in lab-on-a-chip systems for sample generation and dosing, at microfluidic T-shaped nozzles from elastic feed lines. A narrow nozzle forms a barrier for a liquid–liquid interface, such that pressure can build up behind the nozzle up to a critical pressure. Above this critical pressure, the liquid bursts into the main channel. Build-up of pressure is possible when the fluid before the nozzle is compressible or when the channel that leads to the nozzle is elastic. We explore the value of the critical pressure and the time required to achieve it. We describe the fluid flow of the sudden burst, globally in terms of flow rate into the channel and spatially resolved in terms of flow fields measured using micro-PIV. A total of three different stages—the lag phase, a spill out phase, and a linear growth phase—can be clearly discriminated during droplet formation. The lag time linearly scales with the curvature of the interface inside the nozzle and is inversly proportional to the flow rate of the dispersed phase. A complete overview of the evolution of the growth of droplets and the internal flow structure is provided in the digital supplement.
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页码:497 / 507
页数:10
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