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Drop-on-demand satellite-free drop formation for precision fluid delivery [video] Open Access

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.

Descriptions

Resource type

Video

Contributors

Creator: Yang, Lisong ¹
Editor: Yang, Lisong ¹
Creator: Kapur, Nik ²
Contact person: Kapur, Nik ²
Editor: Kapur, Nik ²
Creator: Wang, Yiwei ²
Creator: Fiesser, Fritz ³
Creator: Bierbrauer, Frank ²
Creator: Wilson, Mark C.T. ²
Creator: Sabey, Tim ⁴
Creator: Bain, Colin D. ¹
Contact person: Bain, Colin D. ¹
Editor: Bain, Colin D. ¹

¹ Durham University, UK
² University of Leeds, UK
³ GlaxoSmithKline, Collegeville, Philadelphia, PA 19426, USA
⁴ GlaxoSmithKline, Barnard Castle, Co. Durham, UK

Funder

Technology Strategy Board

Research methods

Other description

Keyword

Drop-on-demand
satellite
flow rate
Newtonian fluid
Non-Newtonian fluid
digital printing
microlitre drop
Newtonian and Non-Newtonian fluid

Subject

Non-Newtonian fluids
Newtonian fluids

Location

Language

Cited in

doi:10.1016/j.ces.2018.04.014

Identifier

ark:/32150/r1mw22v546r
doi:10.15128/r1mw22v546r

Rights

All rights reserved All rights reserved

Publisher

Durham University

Date Created

File Details

Depositor

L. Yang

Date Uploaded

15 January 2018, 12:01:04

Date Modified

21 April 2021, 12:04:32

Audit Status

Audits have not yet been run on this file.

Characterization

File format: zip (ZIP Format)

Mime type: application/zip

File size: 3713417

Last modified: 2018:01:15 12:04:30+00:00

Filename: LDT precision fluid delivery CES Elsevier.zip

Original checksum: 5a4dd32e3e908ab794e8ae275456e6b6