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Hydrodynamic characterization of continuous flow of Pickering droplets with solid nanoparticles in microchannel reactors

Hydrodynamic characterization of continuous flow of Pickering droplets with solid nanoparticles in microchannel reactors
Hydrodynamic characterization of continuous flow of Pickering droplets with solid nanoparticles in microchannel reactors

In this work, a method based on Pickering emulsion systems (PES) was proposed to manipulate multiphase processes containing solid particles in microchannels without adhesion and/or accumulation. The flow hydrodynamics of PES in a microchannel were systematically characterized. For comparison, a suspension system (SS, ethyl acetate with suspended SiO2 nanoparticles-water) and a viscous fluid system (VFS, ethyl acetate with methyl-silicone oil–water) were examined. It was found liquid–liquid two-phase characteristics of PES, SS and VFS around T-junction within the main microchannel depended on surface hydrophobicity of stabilizing SiO2 nanoparticles, amount of SiO2 particles added, viscosity and flow rate. Four flow patterns were observed under these operating conditions for PES and VFS, where superficial velocity was the key factor affecting the flow patterns transition. Finally, a scaling law of the droplet size was established as a function of Qd/Qc, μdc and Ca.

Hydrodynamics, Microchannel reactors, Pickering emulsion, Slug flow, Solid particles
0009-2509
Sun, Wenxing
0349c9bd-2368-4dab-8f07-3b4724bb9627
Zhang, Xunli
d7cf1181-3276-4da1-9150-e212b333abb1
Yao, Chaoqun
cc3a5762-0118-421f-90d0-f09185ca3ded
Wang, Qingqiang
5f80e94c-3f20-4923-9f5b-aa532056083f
Jin, Nan
fc249849-9c44-4662-9f87-6e69ccc80d3d
Lv, Hongying
b7050417-1907-4cb0-a116-525102f3e4ae
Zhao, Yuchao
f9e14ac5-b0ba-49b8-8e63-72c1d5d3755d
Sun, Wenxing
0349c9bd-2368-4dab-8f07-3b4724bb9627
Zhang, Xunli
d7cf1181-3276-4da1-9150-e212b333abb1
Yao, Chaoqun
cc3a5762-0118-421f-90d0-f09185ca3ded
Wang, Qingqiang
5f80e94c-3f20-4923-9f5b-aa532056083f
Jin, Nan
fc249849-9c44-4662-9f87-6e69ccc80d3d
Lv, Hongying
b7050417-1907-4cb0-a116-525102f3e4ae
Zhao, Yuchao
f9e14ac5-b0ba-49b8-8e63-72c1d5d3755d

Sun, Wenxing, Zhang, Xunli, Yao, Chaoqun, Wang, Qingqiang, Jin, Nan, Lv, Hongying and Zhao, Yuchao (2021) Hydrodynamic characterization of continuous flow of Pickering droplets with solid nanoparticles in microchannel reactors. Chemical Engineering Science, 245, [116838]. (doi:10.1016/j.ces.2021.116838).

Record type: Article

Abstract

In this work, a method based on Pickering emulsion systems (PES) was proposed to manipulate multiphase processes containing solid particles in microchannels without adhesion and/or accumulation. The flow hydrodynamics of PES in a microchannel were systematically characterized. For comparison, a suspension system (SS, ethyl acetate with suspended SiO2 nanoparticles-water) and a viscous fluid system (VFS, ethyl acetate with methyl-silicone oil–water) were examined. It was found liquid–liquid two-phase characteristics of PES, SS and VFS around T-junction within the main microchannel depended on surface hydrophobicity of stabilizing SiO2 nanoparticles, amount of SiO2 particles added, viscosity and flow rate. Four flow patterns were observed under these operating conditions for PES and VFS, where superficial velocity was the key factor affecting the flow patterns transition. Finally, a scaling law of the droplet size was established as a function of Qd/Qc, μdc and Ca.

Text
CES-D-21-00138_R2 - Accepted Manuscript
Restricted to Repository staff only until 11 June 2022.
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More information

Accepted/In Press date: 1 June 2021
e-pub ahead of print date: 11 June 2021
Published date: 14 December 2021
Additional Information: Funding Information: We gratefully acknowledge the financial supports from National Natural Science Foundation of China (Nos. 21978250, 21808194), Natural Science Foundation of Shandong Province (ZR2017BB058) and Key Technology Research and Development Program of Shandong (2019JZZY010410). Publisher Copyright: © 2021 Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
Keywords: Hydrodynamics, Microchannel reactors, Pickering emulsion, Slug flow, Solid particles

Identifiers

Local EPrints ID: 450058
URI: http://eprints.soton.ac.uk/id/eprint/450058
ISSN: 0009-2509
PURE UUID: d96d067c-19ee-401e-8114-4739d23463a8
ORCID for Xunli Zhang: ORCID iD orcid.org/0000-0002-4375-1571

Catalogue record

Date deposited: 07 Jul 2021 16:31
Last modified: 26 Nov 2021 02:52

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Contributors

Author: Wenxing Sun
Author: Xunli Zhang ORCID iD
Author: Chaoqun Yao
Author: Qingqiang Wang
Author: Nan Jin
Author: Hongying Lv
Author: Yuchao Zhao

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