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相关概念视频

General Characteristics of Pipe Flow II01:24

General Characteristics of Pipe Flow II

1.1K
When fluid enters a pipe, it first passes through the entrance region, where the velocity profile adjusts due to viscous effects. In this region, a boundary layer forms along the pipe walls and grows until it fully occupies the pipe's cross-section. Once the boundary layer merges, the flow becomes fully developed, with a steady velocity profile that remains consistent along the pipe's length.
The distance to reach a fully developed flow is called the entrance length and depends on the...
1.1K
Boundary Layer Characteristics01:18

Boundary Layer Characteristics

63
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...
63
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

160
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.
160
Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

179
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
179
Steady Flow of a Fluid Stream01:27

Steady Flow of a Fluid Stream

275
Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
275
Couette Flow01:22

Couette Flow

237
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...
237

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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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在差距扩张驱动的界面流中稳定过渡.

Dongqi Li1,2,3, Zhibing Yang1,2, Amir A Pahlavan4

  • 1State Key Laboratory of Water Resources Engineering and Management, <a href="https://ror.org/033vjfk17">Wuhan University</a>, Wuhan 430072, People's Republic of China.

Physical review letters
|August 2, 2024
PubMed
概括

我们研究了升起的Hele-Shaw细胞中的流体动力学,发现了界面不稳定性的新标准. 我们的结果揭示了层次流体结构,改善了对模式演变的预测.

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Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
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相关实验视频

Last Updated: Jun 18, 2025

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
06:26

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

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Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
11:51

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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
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科学领域:

  • 流体动力学 流体动力学
  • 接口现象 接口现象
  • 模式形成的形成模式.

背景情况:

  • 黑勒-肖细胞对于研究流体动力学至关重要.
  • 接口不稳定性控制流体系统中的模式形成.
  • 线性稳定性理论往往预测不稳定性开始太严格.

研究的目的:

  • 在升起的Hele-Shaw细胞中调查接口不稳定性.
  • 描述从稳定的流体模式转变为不稳定的流体模式.
  • 制定一个更准确的不稳定性开始的标准.

主要方法:

  • 对Hele-Shaw细胞动态的实验研究.
  • 使用线性稳定性理论进行理论分析.
  • 开发和验证一个新的基于扰动幅度的标准.

主要成果:

  • 在理论和实验之间发现不一致的不稳定性开始.
  • 建议的扰动幅度标准与实验有很好的一致性.
  • 观察到指纹模式演变为等级结构的演变.

结论:

  • 扰动增速标准对于Hele-Shaw界面不稳定性是不够的.
  • 一个基于扰动幅度的新标准准确地预测了不稳定的开始.
  • 为了预测手指模式的演变,我们得出了一个理论方程.