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微棒在切削流中滚动和排序,这种流动是由杆壁相互作用引起的

Martin Wittmann¹, Igor M Kulić², Antonio Stocco²

¹Physical Chemistry, TU Dresden, Zellescher Weg 19, 01069 Dresden, Germany.

|October 31, 2024

概括

我们研究了棒状微粒如何在表面附近移动,发现它们可以横向移动以剪切流并垂直对齐. 这项研究对于理解软物质和粒子动态是至关重要的.

科学领域:

软物质物理学软物质物理学
接口科学接口科学
微粒子动力学微粒子动力学

背景情况:

在接口附近的粒子动态对于生物膜形成和药物输送等现象至关重要.
外界场 (剪切,电,重力) 显著影响微粒子运动.
了解微棒在表面附近的行为对于控制界面过程至关重要.

研究的目的:

为了研究在固体墙壁附近的杆状微粒的转换和旋转动力学.
分析剪流对微棒运动的影响.
为了阐明水力动力学,表面力和布朗运动的相互作用.

主要方法:

结合实验调查与理论建模.
观察到微棒在存在或不存在剪流时的行为.
分析了在固体界面附近的粒子轨迹和方向.

主要成果:

微棒表现出非微不足道的动态,包括与剪切流动方向直角的运动.
粒子显示优先排序,使它们的长轴垂直于流量.
水力动力相互作用,表面力和布朗运动共同决定粒子的行为.

结论:

该研究揭示了微棒在接口上的复杂行为,受多种物理力的影响.
这些发现为控制软物质系统中的粒子方向和运动提供了洞察力.
这项工作有助于对界面微粒子动态的基本理解.

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Thin-Walled Hollow Shafts

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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...