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相关概念视频

Steady Flow of a Fluid Stream01:27

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

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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 purely axial,...
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Steady, Laminar Flow Between Parallel Plates01:17

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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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Conservation of Mass in Finite Cotrol Volume01:16

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The principle of conservation of mass is a fundamental law in fluid mechanics and is applied using the continuity equation. We apply the concept to a finite control volume to derive the continuity equation.
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Conservation of Mass in Fixed, Nondeforming Control Volume01:07

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The principle of conservation of mass is fundamental in fluid dynamics and is crucial for analyzing flow within fixed control volumes, such as pipes or ducts. This principle states that the total mass within a control volume remains constant unless altered by the inflow or outflow of mass through the control surfaces. This results in a vital relationship for steady, incompressible flow where the mass entering a system equals the mass leaving it.
In the case of a sewer pipe, which can be modeled...
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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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Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels
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没有固体壁的液体流量和控制

Peter Dunne1,2, Takuji Adachi1,3, Arvind Arun Dev2

  • 1Université de Strasbourg, CNRS, ISIS, Strasbourg, France.

Nature
|May 8, 2020
PubMed
概括
此摘要是机器生成的。

研究人员开发了新的液体在液体中的流体通道,避免固体墙壁的自我愈合,非堵塞系统. 这种磁场稳定的方法可以轻轻地有效地运输像全人血液这样的微妙液体,

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科学领域:

  • 微流体学
  • 流体动力学
  • 材料科学

背景情况:

  • 微型流体电路面临着固体通道壁的挑战,包括流速限制和污染.
  • 现有的减轻墙壁相互作用的方法 (例如涂层,电湿) 有局限性.
  • 液滴微流体和流避免固体壁,但需要连续流动液体.

研究的目的:

  • 开发一种新的流体通道系统,
  • 创建自我愈合,不堵塞,和防污染的微流体通道.
  • 为了证明精确的流量控制和温和的液体运输,特别是在微妙的生物样本.

主要方法:

  • 水性液体通道被一个不可混合的磁性液体所包围.
  • 一个四极磁场稳定了液体中的液体接口,创造了流体通道.
  • 使用外部永久磁铁进行磁静电,控制液体流动而无需物理接触.

主要成果:

  • 液体中的液体道具有自我愈合,不堵塞和抗污染的特性.
  • 磁静电允许有效的门,分裂,合并和液体.
  • 与周周抽血相比,全人血液的运输显示出血液溶解的数量有所减少.

结论:

  • 这种液体在液体中的方法为传统的微流体道提供了更好的替代方案,特别是对于微妙的液体.
  • 该系统可以在微小尺度上实现精确的流量控制和轻松的运输,而无需高压.
  • 潜在的应用包括先进的微流体电路和改善生物流体的处理.