期刊
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
卷 84, 期 -, 页码 366-374出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2020.01.020
关键词
W1/O/W2 compound droplets; Millimeter-scale; Co-flowing microfluidic device; One-step structure; Flow mechanisms
资金
- National Natural Science Foundation of China [U1530260]
- CAEP foundation [PY20200117]
Millimeter-scale W1/O/W2 compound droplets generation in a co-flowing microfluidic device with one-step structure was symmetrically observed through experiments, and the formation process is distinguished according to the variation law of thread tip velocity. Specially, under a wide range of operation conditions, W1/O/W2 compound droplets form accompanying with the generation of oil phase droplet. The formation ratio of compound droplets to oil phase droplet always depends on the outer phase Capillary number, Ca-w2, and the flow rate ratio, R, of middle to inner phases, and thus the flow pattern diagram is obtained. Further the influences of all phases flow rates, outer phase viscosity as well as the interfacial tension on the formation period and geometric sizes are extensively studied. Finally, a prediction correlation for dimensionless inner and outer diameters with several dimensionless numbers is also obtained. The results could provide an experimental basis for controllably preparing monodisperse compound droplets with millimeter-scale. (C) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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