Lattice Boltzmann simulation of drop splitting in a fractal tree-like microchannel
文献类型：期刊论文
| 作者 | Zhang, Jingchang1,2; Shu, Shuli1; Guan, Xiaoping1; Yang, Ning1,2 |
| 刊名 | CHEMICAL ENGINEERING SCIENCE
 |
| 出版日期 | 2022-04-28 |
| 卷号 | 252页码:13 |
| 关键词 | Microchannel Faster emulsification Lattice Boltzmann method Immersed boundary method Phase-field model |
| ISSN号 | 0009-2509 |
| DOI | 10.1016/j.ces.2021.117277 |
| 英文摘要 | Fractal 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. |
| WOS关键词 | FLOWS ; DYNAMICS ; EMULSION ; FLUID ; MODEL |
| 资助项目 | National 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研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000779510100009 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Natural Science Foundation of China ; Newton Advanced Fellowships of Royal Society |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/52659]  |
| 专题 | 中国科学院过程工程研究所 |
| 通讯作者 | Yang, Ning |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：过程工程研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。