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相关概念视频

Shearing Strain01:20

Shearing Strain

175
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between...
175
Problem Solving on Stress and Strain01:22

Problem Solving on Stress and Strain

655
Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
655
Types of Fluids01:27

Types of Fluids

98
Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and...
98
Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

135
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...
135

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Macro-Rheology Characterization of Gill Raker Mucus in the Silver Carp, Hypophthalmichthys molitrix
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在剪切下激发粒状介质中的风病学制度.

Olfa D'Angelo1,2,3, Matthias Sperl3,4, W Till Kranz3,4

  • 1Université de Toulouse, Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Toulouse, France.

Physical review letters
|April 25, 2025
PubMed
概括
此摘要是机器生成的。

激动的粒状介质表现出复杂的流动行为. 这项研究将使用两个无维数,Péclet数 (Pe) 和剪切与流化功率比率 (Π) 的这些行为统一到一个理论框架中.

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科学领域:

  • 物理 物理学 物理
  • 类风病学 类风病学 类风病学
  • 颗粒力学 颗粒力学

背景情况:

  • 颗粒状介质表现出复杂的质学,包括牛顿式,产应力和剪切加厚行为.
  • 现有的理论框架难以涵盖激动颗粒材料的多样流动模式.
  • 了解颗粒性风病学对于各种科学和工业应用至关重要.

研究的目的:

  • 开发一个统一的理论框架激动颗粒介质.
  • 确定控制颗粒性风病学的关键无维参数.
  • 提出一个包含所有观察到的流动行为的构成关系.

主要方法:

  • 在剪切速率的五个数量级上对空气流化玻璃颗粒的试验测量.
  • 流化诱导的振动与布朗运动的比较.
  • 使用无维数的数量分析风湿学数据.

主要成果:

  • 所有激动颗粒介质的风学模式都可以用Péclet数 (Pe) 和剪切与流化功率比率 (Π) 来划分.
  • 提出了一种新的构成关系,从数量和质量上捕捉所有流动行为.
  • 该框架成功地统一了牛顿式,产应力和剪切加厚制度.

结论:

  • 一个基于Pe和 Π的统一框架有效地描述了激动颗粒介质的体质.
  • 拟议的构成关系为颗粒流提供了一个全面的模型.
  • 这项工作推进了对复杂颗粒物质行为的理论理解.