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相关概念视频

Free Jet01:14

Free Jet

121
Free jets describe the flow of liquid exiting a reservoir through an opening into the atmosphere without resistance. The velocity (v) of the liquid jet is derived using Bernoulli's principle and expressed as:
121
Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

145
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...
145
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

130
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.
130
Bernoulli's Equation for Flow Normal to a Streamline01:16

Bernoulli's Equation for Flow Normal to a Streamline

551
Bernoulli's equation for flow normal to a streamline explains how pressure varies across curved streamlines due to the outward centrifugal forces induced by the fluid's curvature. The pressure is higher on the inner side of the curve, near the center of curvature, and decreases outward to balance these centrifugal forces.
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines.
551
Bernoulli's Equation for Flow Along a Streamline01:30

Bernoulli's Equation for Flow Along a Streamline

640
Bernoulli's equation relates the energy conservation in a fluid moving along a streamline. The equation applies to incompressible and inviscid fluids under steady flow. For such a flow, Newton's second law is applied to a small fluid element, which experiences forces due to pressure differences, gravity, and velocity variations. The force balance leads to the following form of Bernoulli's equation:
640
Laminar Flow01:27

Laminar Flow

600
Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
600

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相关实验视频

Updated: Jun 3, 2025

Microfluidic Chips Controlled with Elastomeric Microvalve Arrays
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控制在角落周围的流量偏移角度,使用微喷射阵列.

Yuto Nakadori1, Satoshi Yuura1, Takahiro Kagawa1

  • 1Department of Advanced Science and Technology, Toyota Technological Institute, 2-12-1 Hisakata, Tempaku-Ku, Nagoya, Aichi, 468-8511, Japan.

Scientific reports
|January 6, 2025
PubMed
概括

一种新的微喷射阵列技术积极控制在角落周围的空气流. 这种方法通过操纵旋动力学来精确调整流量偏移,为空气动力学行为提供精确的控制.

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科学领域:

  • 流体动力学 流体动力学
  • 空气动力学 在空气动力学.
  • 流量控制器的流量控制器

背景情况:

  • 控制角落周围的空气流在各种工程应用中至关重要.
  • 传统的方法往往缺乏精度和效率.

研究的目的:

  • 使用微喷射阵列引入一种新的活跃流量控制技术.
  • 为了确定影响在角落周围的流量偏移角度的关键参数.

主要方法:

  • 使用微喷射阵列从向下游的阶段注入喷射器.
  • 采用粒子图像速度计 (PIV) 来测量流速.
  • 引入了一个动量系数来减少数据.

主要成果:

  • 微喷射注射产生了一个,将流向下拉.
  • 随着供应压力 (喷气马赫数) 的增加,流量偏斜角度会增加.
  • 在动量系数和流线斜率之间发现了线性关系.

结论:

  • 微喷射阵列可以有效地主动控制流量偏移.
  • 动量系数参数允许精确的,独立于速度的流量偏移控制.
  • 这种技术为角落流量提供了精确的空气动力学控制.