Journal
SCIENTIFIC REPORTS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep11102
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Funding
- Research Grants Council of Hong Kong [GRF17207914, GRF HKU717613E, GRF HKU718111E]
- University of Hong Kong [URC 201411159074, 201311159187]
- Zhejiang Provincial, Hangzhou Municipal Government
- Lin'an County Government
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We report tip-multi-breaking (TMB) mode of droplet breakup in capillary microfluidic devices. This new mode appears in a region embraced by Ca-i = 0 and lg(Ca-i) = -8.371(Ca-0) -7.36 with Ca-0 varying from 0.35 to 0.63 on the Ca-i -Ca-0 phase diagram, Ca-i and Ca-0 being the capillary numbers of inner and outer fluids, respectively. The mode is featured with a periodic, constant-speed thinning of the inner liquid tip and periodic formation of a sequence of droplets. The droplet number n in a sequence is determined by and increases with outer phase capillary number, and varies from two to over ten. The distribution of both pinch-off time and size of the droplets in a sequence is a geometric progression of common ratio that depends exclusively on and increases monotonically with the droplet number from its minimum value of 0.5 at n = 2 to its maximum value of 1 as n tends to infinity. These features can help identify the unique geometric morphology of droplet clusters and make them promising candidates for encryption and anti-fake identification.
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