CAS OpenIR
Lattice Boltzmann simulation of drop splitting in a fractal tree-like microchannel
Zhang, Jingchang1,2; Shu, Shuli1; Guan, Xiaoping1; Yang, Ning1,2
2022-04-28
Source PublicationCHEMICAL ENGINEERING SCIENCE
ISSN0009-2509
Volume252Pages:13
AbstractFractal tree-like microchannel is advantageous to faster emulsification and droplet production in microchannels. Although computer simulation is becoming a powerful tool for design and optimization, precise treatment of a large number of walls in fractal tree-like microchannel is troublesome. The numer-ical roughness caused by traditional bounce-back boundary condition may accumulate and generate large errors in flow pattern recognization. In this paper, an approach integrating Immersed Boundary Method (IBM), Phase-Field Model (PFM) and Lattice Boltzmann Method (LBM) is developed, aiming to accurately simulate droplet splitting in fractal tree-like microchannel system involving surfactants and wetting boundary walls. Then the operating conditions including capillary number, flow rate ratio and wetting boundary conditions were optimized. We found that the capillary number in 0.02 ti 0.05 and flow rate ratio in 1/3.6 - 1/9 can accelerate emulsification. Hydrophobic-lipophilic walls generate a slug-like water drop of bullet shape and thin oil film between the drop and walls, facilitating drop move-ment in microchannel. The effects of surfactant, Marangoni stress and interfacial tension force on droplet splitting were investigated. The contact walls at the corner and forks resist the surfactant migration, and therefore enrich surfactant at the upstream end of drop interface, leading to uneven distribution of inter-facial tension. The breaking interfaces and the interfaces contacting with wall or fork are subjected to opposite reaction of Marangoni stress and tend to be thinner and finally deform or break. (c) 2021 Elsevier Ltd. All rights reserved.
KeywordMicrochannel Faster emulsification Lattice Boltzmann method Immersed boundary method Phase-field model
DOI10.1016/j.ces.2021.117277
Language英语
WOS KeywordFLOWS ; DYNAMICS ; EMULSION ; FLUID ; MODEL
Funding ProjectNational Natural Science Foundation of China[21925805] ; National Natural Science Foundation of China[22178354] ; National Natural Science Foundation of China[22061130204] ; National Natural Science Foundation of China[91834303] ; Newton Advanced Fellowships of Royal Society[NAF\R1\201305]
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNational Natural Science Foundation of China ; Newton Advanced Fellowships of Royal Society
WOS IDWOS:000779510100009
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/52660
Collection中国科学院过程工程研究所
Corresponding AuthorYang, Ning
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, POB 353, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Jingchang,Shu, Shuli,Guan, Xiaoping,et al. Lattice Boltzmann simulation of drop splitting in a fractal tree-like microchannel[J]. CHEMICAL ENGINEERING SCIENCE,2022,252:13.
APA Zhang, Jingchang,Shu, Shuli,Guan, Xiaoping,&Yang, Ning.(2022).Lattice Boltzmann simulation of drop splitting in a fractal tree-like microchannel.CHEMICAL ENGINEERING SCIENCE,252,13.
MLA Zhang, Jingchang,et al."Lattice Boltzmann simulation of drop splitting in a fractal tree-like microchannel".CHEMICAL ENGINEERING SCIENCE 252(2022):13.
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