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Laminar and Turbulent Flow01:07

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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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统一的框架激光诱导的微频道内的短暂泡动态.

Nagaraj Nagalingam1, Vikram Korede1, Daniel Irimia1

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概括

我们使用激光诱导的化气泡研究了狭窄空间中的振荡流. 道几何学决定了流量特征,我们观察到低雷诺兹数模式中的意想不到的流量扭曲.

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科学领域:

  • 流体动力学 流体动力学
  • 微流体学 微流体学
  • 声波化声学化

背景情况:

  • 狭小空间中的振荡流对于生理学理解和微型设备设计至关重要.
  • 激光诱导的化气泡提供了一种产生受控振荡流的方法.

研究的目的:

  • 为了研究激光能量,泡动力学和流动特征之间的关系.
  • 为了确定道几何学对振荡流量参数的影响.
  • 为了识别和描述低雷诺兹数的流动不稳定性.

主要方法:

  • 对振荡流的理论分析和实验研究.
  • 使用激光诱导的空心气泡来产生流体运动.
  • 使用各种通道几何形状 (形状,尺寸,长度) 来研究几何效应.
  • 使用雷诺兹和沃默斯利数和对流时间尺度分析流动行为.

主要成果:

  • 气泡的大小和寿命与所提供的激光能量直接相关.
  • 特性流速,时间和能量尺度完全取决于通道几何.
  • 观察到由于减速过程中边界层分离而导致的瞬时流动扭曲,这与低雷诺兹数流动的预期相反.
  • 在两个阶段出现扭曲的层状状态的特征:不稳定性的出现和增长.

结论:

  • 道几何是狭小空间中振荡流动特征的主要决定因素.
  • 流动不稳定性甚至可以发生在低雷诺兹数振荡流中.
  • 这些发现为设计利用化产生的脉动流的微系统提供了洞察力.