Coalescence of sessile droplets of varying viscosities for line printing
International Journal of Multiphase Flow, ISSN: 0301-9322, Vol: 56, Page: 138-148
2013
- 27Citations
- 50Captures
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Article Description
Coalescence of sessile droplets is studied experimentally with water–glycerin mixtures of different viscosities. Effects of viscosity on the dimensionless spreading length ( Ψ ) and the center-to-center distance ( L ) are investigated for two droplets; the first droplet ( Ds ) 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, Ψ is maximum when L approaches zero (or λ → 1, where λ = 1 − L / Ds ), which represents a head-on collision. For a high viscosity fluid, Ψ is minimum when λ → 0.6. The effect of λ 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 λ > 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.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0301932213000918; http://dx.doi.org/10.1016/j.ijmultiphaseflow.2013.06.004; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84880411011&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0301932213000918; https://dx.doi.org/10.1016/j.ijmultiphaseflow.2013.06.004
Elsevier BV
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