Coalescence of Sessile Droplets of Varying Viscosities for Line Printing

Title
Coalescence of Sessile Droplets of Varying Viscosities for Line Printing
Authors
이민욱Na Young KimSanjeev ChandraSam S. Yoon
Keywords
Line printing; Coalescence; Viscosity; Droplet impact; Spreading; Wettability
Issue Date
2013-10
Publisher
International journal of multiphase flow
Citation
VOL 56-148
Abstract
Coalescence of sessile droplets is studied experimentally with water-glycerin mixtures of different viscosities. Effects of viscosity on the dimensionless spreading length (Psi) and the center-to-center distance (L) are investigated for two droplets; the first droplet (D-s) is stationary on a substrate and the second droplet (D-0) landing at a center-to-center distance L from the first droplet. For a low viscosity fluid, Psi is maximum when L approaches zero (or lambda -> 1, where lambda = 1 - L/D-s), which represents a head-on collision. For a high viscosity fluid, Psi is minimum when lambda -> 0.6. The effect of lambda on line printing for various viscosities is also examined by printing multiple droplets. We found that the larger the viscosity, the less the breakup between droplets; viscosities smaller than 60 wt% glycerin yielded line breakup. The overlap ratio of lambda > 0.3 produced not a line, but a bigger droplet or puddle because of coalescence. Data obtained in this work can provide insights for the fabrication of conductive microtracks or microinterconnects in printed-electronics applications where a line breakup between droplets would lead to an electrical circuit short.
URI
http://pubs.kist.re.kr/handle/201004/66228
ISSN
0301-9322
Appears in Collections:
KIST Publication > Article
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