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相关概念视频

Irrotational Flow01:28

Irrotational Flow

553
Irrotational flow is characterized by fluid motion where particles do not rotate around their axes, resulting in zero vorticity. For a flow to be irrotational, the curl of the velocity field must be zero. This imposes specific conditions on velocity gradients. For instance, to maintain zero rotation about the z-axis, the gradient condition:
553
Turbulent Flow01:24

Turbulent Flow

277
Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent...
277
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

330
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.
330
Boundary Layer Characteristics01:18

Boundary Layer Characteristics

216
When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
216
Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

392
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...
392
Couette Flow01:22

Couette Flow

439
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
439

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相关实验视频

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Magnetically Induced Rotating Rayleigh-Taylor Instability
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在双层颗粒流中雷利-泰勒不稳定性.

Umberto D'Ortona1, Denis Martinand1, Nathalie Thomas2

  • 1M2P2, Aix Marseille University, CNRS, Centrale Méditérannée, Marseille, France.

Physical review. E
|August 19, 2025
PubMed
概括

这项研究揭示了不同密度的颗粒材料如何表现出雷利-泰勒式的不稳定性,形成有组织的带和卷. 颗粒大小分离和沉积影响了界面上的混合动力学.

科学领域:

  • 物理 物理学 物理
  • 地质物理学 地质物理学
  • 材料科学 材料科学 材料科学

背景情况:

  • 颗粒状材料在引力作用下表现出复杂的行为.
  • 雷利-泰勒不稳定性 (RTI) 是流体动力学中已知的现象.
  • 了解细粒度的RTI对于地球物理流和工业过程至关重要.

研究的目的:

  • 为了研究二层颗粒系统中的雷利-泰勒类不稳定性.
  • 将数值模拟与实验结果进行比较.
  • 分析颗粒性质和流动动力学在颗粒型RTI中的作用.

主要方法:

  • 使用离散元素方法 (DEM) 与倾斜引力进行数值模拟.
  • 实验设置涉及一个带有封闭门的倾斜通道.
  • 分析粒子运动,羽毛形成和带组织.

主要成果:

  • 颗粒状RTI的迅速发作,表面出现光粒子的羽毛.
  • 由于流动和剪切,羽毛组织成密集和轻颗粒的交替带.
  • 密集的颗粒分离到表面,维持纵向的卷.
  • 颗粒型RTI表现出类似于流体RTI的特征,包括波长和生长率的依赖性.

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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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相关实验视频

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Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
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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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结论:

  • 颗粒型RTI与流体RTI有相似之处,但通过沉积和尺寸分离而改变.
  • 沉积促进了扩散,而尺寸分离则起到了反扩散的作用.
  • 这些相互竞争的过程控制了颗粒层之间的界面上的混合区.