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相关概念视频

Free Jet01:14

Free Jet

150
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:
150
Buoyancy and Stability for Submerged and Floating Bodies01:11

Buoyancy and Stability for Submerged and Floating Bodies

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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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Turbulent Flow: Problem Solving01:09

Turbulent Flow: Problem Solving

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Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures...
114
Bernoulli's Equation for Flow Along a Streamline01:30

Bernoulli's Equation for Flow Along a Streamline

957
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:
957
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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Bernoulli's Equation for Flow Normal to a Streamline01:16

Bernoulli's Equation for Flow Normal to a Streamline

848
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.
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相关实验视频

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Visualization of High Speed Liquid Jet Impaction on a Moving Surface
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预测浮力喷气机的特性:一种机器学习方法.

Hossein Hassanzadeh1, Saptarshi Joshi1, Seyed Mohammad Taghavi1

  • 1Department of Chemical Engineering, Université Laval, Québec, QC, G1V 0A6, Canada.

Chemical product and process modeling
|May 20, 2024
PubMed
概括

我们使用机器学习来预测浮力混合喷气的特征,发现随机森林算法最准确地预测了层状长度和传播角度.

科学领域:

  • 流体动力学 流体动力学
  • 机器学习应用程序 机器学习应用程序

背景情况:

  • 积极浮动的混合喷气在各种工业和环境过程中至关重要.
  • 精确预测喷气体特性,如层状长度和扩散角度,对于建模和控制至关重要.

研究的目的:

  • 采用监督机器学习技术来预测可混合喷气的关键特性.
  • 将不同机器学习算法的性能与经验相关性进行比较.

主要方法:

  • 高速成像和平面激光诱导的光被用于数据采集.
  • 使用监督机器学习算法,包括线性回归,支持向量回归,随机森林,K-最近邻居和人工神经网络.
  • 模型性能使用标准指标进行评估.

主要成果:

  • 与其他测试模型相比,随机森林算法在预测喷气特性方面表现优越.
  • 随机森林模型显著优于最近的经验相关性,特别是在预测层状长度方面.
  • 通过广泛的雷诺兹和阿基米德数来实现准确的预测.

结论:

  • 监督机器学习,特别是随机森林算法,提供了一个非常准确的方法来预测可混合喷气体的特性.
  • 这种方法比传统的经验相关性提供了显著的改进,特别是在层状长度预测方面.
关键词:
浮力喷气式飞机的飞行器流体力学的流体力学层状的长度是层状的长度机器学习是机器学习.扩展角度的角度扩展角度.

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  • 这些发现对增强浮力喷气现象的建模和控制有意义.