通过无序的介质分散运行和的微游泳者
1Department of Mechanical and Aerospace Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA.
Physical review. E
|January 20, 2024
概括
在多孔介质中的微游泳器由于碰撞而表现出减少的扩散性. 它们的运输的特点是普遍的障碍功能,取决于障碍物密度和粒子Péclet数.
科学领域:
- 复杂流体的物理 复杂流体的物理
- 微生物运输现象 微生物运输现象
- 无序系统的统计力学.
背景情况:
- 微生物和自行粒子对人类健康和微生物生态学至关重要.
- 在自由空间中,微游泳者表现出随机步行,由自我推进和定向动力学来支配.
- 多孔介质阻碍粒子运动,降低有效的空间扩散性.
研究的目的:
- 分析微游泳器在二维多孔隙介质中的运输特性.
- 为了研究障碍物碰撞对粒子扩散性的影响.
- 开发一个模型,描述微游泳者在无序媒体中的行为.
主要方法:
- 在2D介质中模拟非相互作用的点粒子,以跑动动态.
- 模拟硬球碰撞,使用圆形障碍物和表面滑动.
- 对稀释介质的分析导出和对更密集介质的随机模拟.
主要成果:
- 与自由空间相比,多孔介质中的颗粒扩散性减少.
- 一个普遍的无维障碍函数,f{\displaystyle f} ,描述了扩散度的变化.
- 障碍函数取决于障碍面积分数 (φ) 和Péclet数 (Pe).
结论:
- 这项研究为了解在多孔环境中微型游泳物运输提供了一个框架.
- 衍生的障碍函数提供了对微观结构影响的粒子动态的见解.
- 该模型可适应三维分散分析.
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