4.7 Article Proceedings Paper

Coalescences of microdroplets at a cross-shaped microchannel junction without strictly synchronism control

Journal

CHEMICAL ENGINEERING JOURNAL
Volume 227, Issue -, Pages 90-96

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2012.09.060

Keywords

Coalescence; Microdroplet; Cross-shaped junction; Microchannel

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In addition to the generation of micrometer scaled droplets, microchannel device can also serve as unique platform to control microdroplet coalescence. In this study, a cross-shaped microchannel junction is designed to realize head-on microdroplet coalescence without strict control of droplet synchronism. The flow characters of contacting microdroplets in confined microchannels are carefully examined and a critical capillary number (Ca* approximate to 0.005) for the occurrence of coalescence is identified for different working systems. Experimental analysis on the film drainage time and the droplet contact time are carefully discussed and a comparison between microdroplet coalescences in confined and free flowing spaces are taken for the in-depth understanding of microdroplet coalescence process. (C) 2012 Elsevier B.V. All rights reserved.

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