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Open AccessArticle

Effects of Flow Rates and Density Matching on the Integrity of Solid Particles Coated by Water Phase Compound Droplets during the Transport Process

1
School of Chemical Engineering, Sichuan University, Chengdu 610065, China
2
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
*
Authors to whom correspondence should be addressed.
Coatings 2018, 8(5), 191; https://doi.org/10.3390/coatings8050191
Received: 8 April 2018 / Revised: 5 May 2018 / Accepted: 17 May 2018 / Published: 19 May 2018
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PDF [4370 KB, uploaded 19 May 2018]
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Abstract

To achieve the integrity of solid particles coated by water phase (S/W/O) compound droplets, it is important to investigate the transport process of the compound droplets in the horizontal straight channel. The experimental results show that the integrity is significantly influenced by the flow rates and density difference. The water (W) phase is observed to be peeled off from the surface of the particles (polystyrene (PS) shells), mainly caused by the slip velocity of the W phase and the density mismatching among three phases. During the peeling off process, a relative motion between the solid (S) and W phases initially occurs, causing a decrease of the distance (δ) between them, and then, the PS shell is driven to pass through the W/O interface under the action of drag force and net gravity. It is also found that increasing flow rates of both phases contributes to obtaining integrated compound droplets. A boundary that separates the integrated from damaged compound droplets also exits when the fluid properties are fixed. Above the line of the boundary, compound droplets with integrity are prepared. Moreover, the absolute optimum density matching between the S and W phases is less than 0.003 g/cm3, while that between the W and oil (O) phases is less than 0.005 g/cm3. View Full-Text
Keywords: S/W/O compound droplets; horizontal T-junction device; transport process; slip velocity; density matching S/W/O compound droplets; horizontal T-junction device; transport process; slip velocity; density matching
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Pan, D.; Liu, M.; Chen, Q.; Huang, W.; Li, B. Effects of Flow Rates and Density Matching on the Integrity of Solid Particles Coated by Water Phase Compound Droplets during the Transport Process. Coatings 2018, 8, 191.

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