4.6 Article

Precise monodisperse droplet production in a flow-focusing microdroplet generator

Journal

CHEMICAL ENGINEERING RESEARCH & DESIGN
Volume 160, Issue -, Pages 321-325

Publisher

ELSEVIER
DOI: 10.1016/j.cherd.2020.06.002

Keywords

Droplet; Flow-focusing; Size; Pressure-driven flow

Funding

  1. National Natural Science Foundation of China [51705099]
  2. China Postdoctoral Science Foundation [2018M630347]
  3. Heilongjiang Postdoctoral Science Foundation [LBH-Z17017]
  4. Fundamental Research Funds for the Central Universities
  5. NSRIF [2019048]
  6. Open Foundation of the State Key Laboratory of Fluid Power and Mechatronic Systems [GZKF-2018018]

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To precisely control the size of droplets produced in a flow-focusing microdroplet generator, the pressure-driven device is designed to control the flow rates of the fluids during the experiments of droplet generation. While monodisperse droplets are produced by the pressure-driven microfluidic flows, the nonlinear relation between the droplet length and the driving-pressure ratio of the two phases can be observed for the open-loop control of droplet generation. In particular, by using the method of the closed-loop control of droplet generation, good agreements are shown between the tested size of droplets and the predicted droplet size. Consequently, based on the closed-loop control of droplet generation under pressure-driven flows, the effects of the nonlinearity of the flow-focusing microchannel on the control accuracy of the droplet size is drastically reduced, which can significantly increase the control precision of the droplet size in the flow-focusing micro droplet generator. (C) 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

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