微游泳者的运动在微通道中的空腔上
Xiao Hu1, Weijin Chen1, Jianzhong Lin2
1Key Laboratory of Fluid Transmission Technology of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China.
Soft matter
|March 6, 2024
概括
这项研究使用格子博尔茨曼法和squirmer模型来分析道腔系统中的微游泳运动. 调查结果显示,不同的运动模式受到squirmer类型和雷诺兹数的影响,空腔深度对于微型游泳者分离至关重要.
科学领域:
- 流体动力学 流体动力学
- 微流体学 微流体学
- 计算物理学的计算物理.
背景情况:
- 微游泳者表现出由流体环境影响的复杂行为.
- 了解微游泳器动态对于在向药物输送和实验室芯片设备中的应用至关重要.
- 道腔系统为控制和操纵微型游泳器提供了潜力.
研究的目的:
- 在通道腔系统中研究微游泳者的运动,使用结合格子博尔兹曼法 (LBM) 和squirmer模型.
- 分析型因子 (β),游泳雷诺兹数 (Rep),腔体大小和初始条件对微型游泳者轨迹的影响.
- 探索不同类型的微型游泳器 (Puller,Pusher,Neutral) 的通道腔系统的分离和捕获能力.
主要方法:
- 使用格子博尔茨曼方法 (LBM) 进行流体模拟.
- 采用squirmer模型来表示微游泳者的推进和行为.
- 模拟了三种squirmer类型:拉人 (β > 0),推人 (β < 0) 和中性 (β = 0).
- 调查了各种参数,包括squirmer类型因子,游泳雷诺兹数,腔体尺寸和初始位置.
主要成果:
- 微游泳者运动被分为六种不同的模式,主要由游泳者类型因子 (β) 和游泳雷诺兹数 (Rep) 决定.
- 对于Puller和Pusher游泳者来说,增加Rep导致以恒定β的运动模式转换.
- 最佳的腔深被确定为有效捕捉和分离中性游泳者的关键.
- 这项研究首次探讨了微游泳者行为的复杂通道腔效应,突出了分离和捕获动态.
结论:
- 波动器特征 (β) 和流量条件 (Rep) 之间的相互作用决定了微型游泳器在通道腔系统中的运动模式.
- 道腔的几何形状,特别是腔深,是实现选择性微游泳者分离和捕获的关键因素.
- 这些发现为设计先进的微流体设备提供了宝贵的见解,以高效地操纵和分离微游泳器.
更多相关视频
11:14A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)–Cell Interaction and the Resultant Bioeffects at the Single-cell Level
Published on: January 10, 2017
11.7K
08:19Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
Published on: May 9, 2021
2.2K
相关概念视频
Aquaporins
Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
Buoyancy
When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy. The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the fluid?
To get...
To get...
Rise of Liquid in a Capillary Tube
When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
Buoyancy and Stability for Submerged and Floating Bodies
In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
Uniform Depth Channel Flow
Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
Hydraulic Jump
A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...
