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Drop-on-demand satellite-free drop formation for precision fluid delivery

Yang, Lisong; Kapur, Nik; Wang, Yiwei; Fiesser, Fritz; Bierbrauer, Frank; Wilson, Mark C.T.; Sabey, Tim; Bain, Colin D.

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Authors

Nik Kapur

Yiwei Wang

Fritz Fiesser

Frank Bierbrauer

Mark C.T. Wilson

Tim Sabey



Abstract

A drop-on-demand liquid dispensing system, based on a rotary piston pump, for delivering microlitre droplets at ∼ 10 Hz is analysed. Five types of drop formation are observed under different pump operation schemes, characterised by the breakup behaviour of the thin liquid ligament that develops between the forming drop and the liquid remaining at the dispensing nozzle. A range of control parameters and fluids (Newtonian and non-Newtonian) have been explored in order to identify key system parameters for precise satellite-free drop formation and hence to establish an operating window. Under a conventional ‘one-step-ejection’ pump operation cycle, the window for satellite-free drop production is found to be small and impractical due to the long ligament and large pendant drop at the nozzle. The satellite-free operating window can be expanded dramatically with the ligament and pendant drop size under control with a novel ‘two-step-ejection’ process, in which the drop is first partly grown, then allowed to settle, and then ejected via a second pulse of liquid from the pump. Rapid deceleration of the pump near the maximum flow rate at the end of the second pulse is essential for satellite-free drop production.

Citation

Yang, L., Kapur, N., Wang, Y., Fiesser, F., Bierbrauer, F., Wilson, M. C., …Bain, C. D. (2018). Drop-on-demand satellite-free drop formation for precision fluid delivery. Chemical Engineering Science, 186, 102-115. https://doi.org/10.1016/j.ces.2018.04.014

Journal Article Type Article
Acceptance Date Apr 5, 2018
Online Publication Date Apr 6, 2018
Publication Date Aug 31, 2018
Deposit Date May 1, 2018
Publicly Available Date Apr 6, 2019
Journal Chemical Engineering Science
Print ISSN 0009-2509
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 186
Pages 102-115
DOI https://doi.org/10.1016/j.ces.2018.04.014
Public URL https://durham-repository.worktribe.com/output/1332174

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