一个被动液滴在一个活跃微通道中的自发运动
Adriano Tiribocchi1, Mihir Durve2, Marco Lauricella1
1Istituto per le Applicazioni del Calcolo CNR, via dei Taurini 19, 00185 Rome, Italy. adriano.tiribocchi@cnr.it.
Soft matter
|August 21, 2023
概括
微通道中的活性凝层驱动着被动滴滴运动. 对称的活性凝设计将滴滴变形最小化,与混合设计不同,可以控制微流体设备.
科学领域:
- 软物质物理学 软物质物理学
- 微流体学 微流体学
- 活动物质 活动物质
背景情况:
- 微流体设备对于各种应用至关重要,但控制它们内的被动滴滴动态仍然具有挑战性.
- 活性凝由细胞骨纤维和分子电机等材料组成,表现出自我推进,并可以产生自发的流动.
- 了解有限几何形状中的活性凝和被动物体之间的相互作用是开发新型微流体系统的关键.
研究的目的:
- 为了数值地研究被动液滴的动态,被限制在被活性凝层覆盖的微通道中.
- 探索活性凝层的不同配置 (单层与双层) 如何影响滴滴运动和形态.
- 检查活性凝定条件对产生的流量场和滴滴行为的影响.
主要方法:
- 使用数值模拟来研究活跃的凝涂层微通道内的被动滴滴的流体动力学.
- 为了分析系统的行为,进行了2D和选定的3D模拟.
- 该研究的重点是分析各种活性凝配置下的速度场和滴滴形状.
主要成果:
- 活性凝层产生自发的流动,诱导被动滴滴的直线运动.
- 混合设计 (在一面墙上安装活性凝) 导致圆形滴滴形状,这是由于一个不对称的速度场.
- 两个墙壁上的活性凝产生了一个对称的速度场,显著减少滴滴的形态变形.
- 活性凝在墙壁上的固条件可以控制自发流的结构.
结论:
- 微通道壁上的活性凝涂层可以有效地驱动被动滴滴运动并控制它们的形状.
- 与混合设计相比,对称的活性凝配置在减轻滴水变形方面优越.
- 这些发现为设计利用活性凝的集体性质的先进微流体装置提供了基础.
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