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相关概念视频

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

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Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular...
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Free Jet01:14

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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:
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Laminar Flow: Problem Solving01:24

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Laminar flow occurs when a fluid moves smoothly in parallel layers with minimal mixing and turbulence. In fluid mechanics, ensuring laminar flow within a pipe is essential for precise control of flow characteristics, especially in engineering applications. The key factor in determining whether flow remains laminar is the Reynolds number, a dimensionless quantity that depends on the fluid's velocity, density, viscosity, and the pipe's diameter. A Reynolds number of 2100 or lower...
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Pipe Flowrate Measurement: Problem Solving01:28

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A spray tank system is engineered to uniformly distribute a pest-control liquid across plants by using a pressurized mechanism. The tank, pressurized to 150 kPa, holds the pesticide at a height of 0.80 meters. Liquid flows from the tank through a 1.9 meter pipe with a diameter of 0.015 meters, angled at 0.698 radians, ultimately reaching a 0.007 meter nozzle that sprays the pesticide. Accurate calculation of the system's flow rate is crucial to ensure uniform application, and this is...
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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:
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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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相关实验视频

Updated: Jul 12, 2025

Visualization of High Speed Liquid Jet Impaction on a Moving Surface
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最小数量滑喷气噪声:被动控制

Xiaodong Hu1,2, Junhao Yu1,2, Yuanlong Li1,2

  • 1College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China.

Micromachines
|October 28, 2023
PubMed
概括

微槽喷嘴通过破坏结构,在最小滑量 (MQL) 中显著减少喷气噪声. 这项创新通过降低整体声压水平,提高了操作人员的健康和安全.

关键词:
喷气式飞机噪音喷气式飞机噪音微沟的微沟是一个微沟.最少的滑量是最少的滑量.被动控制是一种被动的控制.

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科学领域:

  • 声学 声学 声学 声学
  • 流体动力学 流体动力学
  • 机械工程 机械工程

背景情况:

  • 在最小滑量 (MQL) 中的喷气噪声对操作员的健康和福祉构成重大风险.
  • 现有的MQL喷嘴缺乏有效的降噪机制,需要创新的解决方案.
  • 生物微槽为空气动力学降噪提供了一个潜在的模型.

研究的目的:

  • 研究一种由生物结构启发的新型微槽喷嘴的降噪机制.
  • 以数值分析原始和微槽喷嘴的流场和声学特征.
  • 为了确定微槽尺寸 (长度,宽度,深度) 对喷气式噪声降低的影响.

主要方法:

  • 使用数值模拟来建模流场和声学特征.
  • 计算流体动力学 (CFD) 和声学分析在标准喷嘴和微槽喷嘴上进行.
  • 为了实验验证,进行了总体声压水平 (OASPL) 测试.

主要成果:

  • 喷气噪声源于大规模的环结构和相关的压力波动.
  • 微槽的宽度 (W) 和深度 (δ) 与降低噪音有积极的相关性,而长度 (L) 增加了噪音.
  • 实现了6.66dB的最大降噪,主要受微槽深度 (δ) 的影响.

结论:

  • 微槽增强喷嘴内空气流的混合,促进旋分解成更小的尺度.
  • 微槽喷嘴有效降低中高频的声压水平 (SPL).
  • 这种生物灵感设计为缓解MQL系统中喷气式噪声提供了一个有希望的策略.