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相关概念视频

Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Colloids and Suspensions01:17

Colloids and Suspensions

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Relation Between the Distributed Load and Shear01:23

Relation Between the Distributed Load and Shear

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Understanding the relationship between the distributed load and shear force in structural analysis is crucial for analyzing beams subjected to various loading conditions. Consider the case of a beam experiencing a distributed load, two concentrated loads, and a couple moment.
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Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

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Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
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Dry Friction01:30

Dry Friction

362
Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
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Viscosity01:17

Viscosity

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When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...
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相关实验视频

Updated: Jun 20, 2025

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
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在干燥的颗粒状剪切流中,两个大颗粒之间的相互作用.

Nathalie Fraysse1, Umberto D'Ortona2, Nathalie Thomas3

  • 1Université Côte d'Azur, CNRS, <a href="https://ror.org/042cesy50">Institut de Physique de Nice</a> (INPHYNI), Nice, France.

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概括

颗粒流中的两个大型入侵者表现出吸引力或排斥力相互作用,它们的相对位置由流动力学决定. 它们的距离在单个曲线上相对应,受粒子大小,流深和倾斜性质的影响.

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Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography
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科学领域:

  • 颗粒状材料的物理学 颗粒状材料的物理学
  • 粒子流的流体动力学 粒子流的流体动力学
  • 复杂的系统相互作用.

背景情况:

  • 在颗粒流中,了解粒子相互作用至关重要.
  • 大颗粒在颗粒状介质中的行为是复杂的.
  • 之前的研究往往简化了粒子相互作用或流动条件.

研究的目的:

  • 为了研究两个大球形粒子 (入侵者) 之间的相互作用动态,在一个干燥的颗粒状流下坡道.
  • 确定影响入侵者交互模式的关键参数 (吸引力与排斥性).
  • 为了建立入侵者间距和流动特征之间的关系.

主要方法:

  • 在受控颗粒流中对入侵者的行为进行实验调查.
  • 数字模拟来补充实验发现和探索参数空间.
  • 参数的系统变化:入侵者尺寸比,流动厚度,斜坡/粗度和密度.

主要成果:

  • 侵入者始终与颗粒流的方向保持一致.
  • 观察到吸引力和排斥力相互作用模式之间的明显过渡.
  • 侵入者分离距离 (纵向和垂直) 紧密相关,形成主曲线.
  • 唤醒和剪切效应被确定为入侵者定位的主要驱动因素.

结论:

  • 侵入者在颗粒状流中的相对位置是可预测的,并由流动诱导的力控制.
  • 这些力量的调节是由于入侵者的重量,浮力和接近边界而发生的.
  • 这些发现提供了对倾斜颗粒流中的多粒子动态的基本理解.