{"title":"Trapping micro-swimmers over a cavity in an inertial micro-channel","authors":"","doi":"10.1016/j.ijmecsci.2024.109796","DOIUrl":null,"url":null,"abstract":"<div><div>Based on the lattice Boltzmann method and the squirmer self-propulsion model, this paper focuses on the motion characteristics of three types of swimmers (neutral swimmer, puller, pusher) over a cavity in an inertial micro-channel. The effects of fluid inertia (<em>Re<sub>f</sub></em>) and channel-cavity structural parameters (<em>L<sub>d</sub>, L<sub>w</sub></em>) on the capture and separation of micro-swimmers are analysed. The results indicate that there are five motion modes of swimmer under low Reynolds number. As fluid inertia increases, three new motion modes emerge. Neutral swimmer is captured at low <em>Re<sub>f</sub></em>, while the puller and pusher are captured at high <em>Re<sub>f</sub></em>. Under a suitable cavity aspect ratio, the puller also exhibits an additional new trapping mode known as the circle loop trapping. Moreover, the pusher with large activity will behave differently at various Reynolds numbers. Ultimately, through data and theoretical analysis, theoretical formulas are developed to reflect the effect of cavity size and Reynolds number on the capture and separation performance through the phase diagram. By integrating the examination of diverse trapping behaviours of microwimmers within complex microchannel structures, this study significantly enhances our understanding of the complex motion of microwimmers in intricate flow environments, and facilitates the manipulation and control of manmade microwimmers.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":null,"pages":null},"PeriodicalIF":7.1000,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Mechanical Sciences","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0020740324008373","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Based on the lattice Boltzmann method and the squirmer self-propulsion model, this paper focuses on the motion characteristics of three types of swimmers (neutral swimmer, puller, pusher) over a cavity in an inertial micro-channel. The effects of fluid inertia (Ref) and channel-cavity structural parameters (Ld, Lw) on the capture and separation of micro-swimmers are analysed. The results indicate that there are five motion modes of swimmer under low Reynolds number. As fluid inertia increases, three new motion modes emerge. Neutral swimmer is captured at low Ref, while the puller and pusher are captured at high Ref. Under a suitable cavity aspect ratio, the puller also exhibits an additional new trapping mode known as the circle loop trapping. Moreover, the pusher with large activity will behave differently at various Reynolds numbers. Ultimately, through data and theoretical analysis, theoretical formulas are developed to reflect the effect of cavity size and Reynolds number on the capture and separation performance through the phase diagram. By integrating the examination of diverse trapping behaviours of microwimmers within complex microchannel structures, this study significantly enhances our understanding of the complex motion of microwimmers in intricate flow environments, and facilitates the manipulation and control of manmade microwimmers.
期刊介绍:
The International Journal of Mechanical Sciences (IJMS) serves as a global platform for the publication and dissemination of original research that contributes to a deeper scientific understanding of the fundamental disciplines within mechanical, civil, and material engineering.
The primary focus of IJMS is to showcase innovative and ground-breaking work that utilizes analytical and computational modeling techniques, such as Finite Element Method (FEM), Boundary Element Method (BEM), and mesh-free methods, among others. These modeling methods are applied to diverse fields including rigid-body mechanics (e.g., dynamics, vibration, stability), structural mechanics, metal forming, advanced materials (e.g., metals, composites, cellular, smart) behavior and applications, impact mechanics, strain localization, and other nonlinear effects (e.g., large deflections, plasticity, fracture).
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