Focused Liquid Pinching in Coaxial Drop Capsule Generation
Nilofar Taraki, A. Said Ismail
TL;DR
This paper studies how an inner drop pinches faster in a coaxial setup due to flow focusing from the outer drop's contraction.
Contribution
The study reveals a new focusing effect in coaxial drop pinching dynamics when the inner-to-outer nozzle radius ratio exceeds 0.67.
Findings
The inner drop pinches faster in a coaxial setup compared to a single drop in a liquid medium.
The thinning rate depends on the outer nozzle size when the radius ratio R̃ exceeds 0.67.
Satellite droplets form when the outer drop squeezes the inner filament above its minimum neck location.
Abstract
The pinching dynamics of an inviscid inner drop in a coaxial pendant drop structure have been investigated here both experimentally and numerically. The thinning rate of the inner drop, when it pinches in an inertial regime in this configuration, is found to be faster than that of a single drop pinching in a liquid medium. This is attributed to a focusing of the flow between the inner and outer drop interfaces induced by the contraction of the outer drop during its own pinching process. Our results reveal that this focusing effect increases dramatically when the ratio of the inner to outer nozzle radii, R̃, in a coaxial nozzle configuration exceeds 0.67. Beyond this value, the thinning rate becomes dependent on the outer nozzle size. Furthermore, the difference between the minimum neck radii of the inner and outer drop, denoted as Δh min, serves as a reliable predictor of the inner…
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Taxonomy
TopicsFluid Dynamics and Heat Transfer · Innovative Microfluidic and Catalytic Techniques Innovation · Electrohydrodynamics and Fluid Dynamics