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相关概念视频

Laminar and Turbulent Flow01:07

Laminar and Turbulent Flow

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Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
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Turbulent Flow01:24

Turbulent Flow

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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...
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Navier–Stokes Equations01:28

Navier–Stokes Equations

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For incompressible Newtonian fluids, where density remains constant, stresses show a linear relationship with the deformation rate, defined by normal and shear stresses. Normal stresses depend on the pressure exerted on the fluid and the rate of deformation in specific directions, which determines how fluid flows under varying pressures. Shear stresses, on the other hand, act tangentially across fluid layers. They explain how adjacent fluid layers slide relative to one another, connecting...
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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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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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Irrotational Flow01:28

Irrotational Flow

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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:
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相关实验视频

Updated: Sep 17, 2025

Forming, Confining, and Observing Microtubule-Based Active Nematics
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Forming, Confining, and Observing Microtubule-Based Active Nematics

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在主动阴性学中非线性自发流动不稳定性.

Ido Lavi1,2, Ricard Alert3,4,5, Jean-François Joanny6,7

  • 1Universitat de Barcelona, Departament de Física de la Matèria Condensada, Martí i Franquès 1, 08028 Barcelona, Spain and UBICS (University of Barcelona Institute of Complex Systems), Martí i Franquès 1, 08028 Barcelona, Spain.

Physical review letters
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概括
此摘要是机器生成的。

即使是稳定的活体导体也可以通过非线性不稳定性过渡到自发流. 这种不连续的过渡,静止状态和流动状态并存,预测用于各种系统,包括收缩杆.

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科学领域:

  • 软物质物理学 软物质物理学
  • 非线性动力学是一种非线性动力学.
  • 活动物质 活动物质

背景情况:

  • 活跃的体通常表现出自发的流动,由于从均状态的线性不稳定性.
  • 了解活性物质的转变对于预测流等复杂行为至关重要.

研究的目的:

  • 为了研究能导致自发流动的活体体质中的非线性不稳定性.
  • 探索静止和流动状态在活跃的阴性系统中的共存.
  • 用不同的参数来描述从连续转变为不连续转变的转变.

主要方法:

  • 弱非线性分析用于研究分叉.
  • 数字模拟用于追踪条纹图案的分叉图.
  • 分析流量调整参数对系统稳定性的影响.

主要成果:

  • 一个线性稳定的均状态可以经历非线性不稳定,导致不连续的过渡到自发流.
  • 叉分支从超临界 (连续) 变为次临界 (不连续),流量调整参数发生变化.
  • 在这些系统中,静止状态和流动状态的共存是可能的.

结论:

  • 不连续的自发流过渡预测了广泛的活跃阴性参数.
  • 这些发现与活跃的阴性流相关,并且适用于像收缩棒这样的系统.
  • 这些预测为使用细胞层或细胞骨悬浮物的实验研究提供了可测试的假设.