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相关概念视频

Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

762
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.
762
Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

517
Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
517
Uniform Depth Channel Flow: Problem Solving01:18

Uniform Depth Channel Flow: Problem Solving

417
To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
417
Stream Function01:20

Stream Function

2.0K
In two-dimensional incompressible fluid flow, the continuity equation is essential for ensuring mass conservation, meaning that any change in fluid entering or exiting a region is balanced by a corresponding change elsewhere. For incompressible flow, where density remains constant, this requirement simplifies to the condition that the divergence of the velocity field must be zero. Mathematically, this is expressed as,
2.0K
Poiseuille's Law and Reynolds Number01:10

Poiseuille's Law and Reynolds Number

9.0K
Any fluid in a horizontal tube can flow due to pressure differences—fluid flows from high to low pressure. The flow rate (Q) is the ratio of pressure difference and resistance through a horizontal tube. The greater the pressure difference, the higher the flow rate. The flow resistance is expressed as:
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Couette Flow01:22

Couette Flow

876
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...
876

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The Diffusion of Passive Tracers in Laminar Shear Flow
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The Diffusion of Passive Tracers in Laminar Shear Flow

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在漏洞道中的流量中使用防散.

Yiming Gan1, Yisen Guo1, John H Thomas1

  • 1University of Rochester, Department of Mechanical Engineering, Rochester, New York 14627, USA.

Physical review letters
|November 30, 2025
PubMed
概括
此摘要是机器生成的。

研究人员发现了"反分散",一种现象,在这种现象中,透的通道壁巩固溶解物,从而导致负有效的轴向扩散性. 这与传统的泰勒分散形成鲜明对比,对药物输送和海水淡化有影响.

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科学领域:

  • 流体动力学 流体动力学
  • 运输现象是运输现象.
  • 化学工程是化学工程的组成部分.

背景情况:

  • 道中的溶液运输对于工业过程,生物力学和药物输送至关重要.
  • 泰勒分散,由于剪切和扩散而导致有效轴向扩散率的增加,是众所周知的现象.
  • 现有的模型没有考虑透通道壁对溶液运输的影响.

研究的目的:

  • 研究具有透气壁的通道中溶液凝固的现象.
  • 引入和定义"反分散"作为一个负有效的轴向扩散性.
  • 开发一个理论模型并提供反分散的数值验证.

主要方法:

  • 开发一个理论模型来描述具有透气壁的通道中溶解物体的运输.
  • 理论模型的数值验证.
  • 分析导致反分散的条件,包括无维透性和流速.

主要成果:

  • 在溶解物和移动溶解物前线中证明了抗分散作用.
  • 确定有利于反分散而不是分散的条件:高无维透性,中等无维流速和较不的度梯度.
  • 对反分散的负有效轴向扩散性特征的量化.

结论:

  • 抗分散是一种新的溶液凝固现象,发生在具有透气壁的通道中.
  • 这些发现为溶液运输机制提供了新的见解.
  • 潜在的应用包括对生物系统的更好理解和药物输送和海水淡化过程的增强设计.