Adhesion of moving droplets in microchannels

被引：19

作者：

Chen, Haosheng ^{[1
]}

Dong, Enkai ^{[2
]}

Li, Jiang ^{[2
]}

Stone, Howard A. ^{[3
]}

机构：

[1] Tsinghua Univ, State Key Lab Tribol, Beijing 100084, Peoples R China

[2] Univ Sci & Technol Beijing, Sch Mech Engn, Beijing 100083, Peoples R China

[3] Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA

来源：

APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 13期

关键词：

ATOMIC-FORCE MICROSCOPE; SUPERHYDROPHOBIC SURFACE; MICROFLUIDIC PRODUCTION; EMULSIONS; WATER; MICROBUBBLES; MOTION;

D O I：

10.1063/1.4823456

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

When oil drops in a continuous water phase move from the hydrophilic to the hydrophobic section of a microchannel, they can be controlled to either adhere or not adhere on the channel by changing the capillary number. Using experiments and a model for the thin film flow, we show that the critical capillary number for adhesion is approximately Ca similar to D-3/4/d(3/2), where D and d is the length of the droplet and the inner dimension of the microchannel, respectively. As one application of these ideas, droplet adhesion is demonstrated as a promising technology for recycling of emulsions in droplet microfluidics. (C) 2013 AIP Publishing LLC.

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