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相关概念视频

Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

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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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Design Example: Flow of Oil Through Circular Pipes01:25

Design Example: Flow of Oil Through Circular Pipes

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Understanding fluid flow behavior through pipes is critical in fluid mechanics, especially in applications like oil transportation through pipelines. Hagen-Poiseuille's law provides an exact solution derived from the Navier-Stokes equations for steady, incompressible, and laminar flow within a circular pipe. Hagen-Poiseuille's law helps determine the necessary pressure drop across a pipeline section by determining parameters like pipe length, radius, oil viscosity, and the desired volumetric...
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Single Pipe Systems01:24

Single Pipe Systems

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In pipe flow analysis, problems are typically categorized into three types — Type I, Type II, and Type III — based on the known parameters and the desired outcome. Each type of problem addresses specific engineering requirements using fluid properties, pipe characteristics, and operational conditions.
In a Type I problem, fluid properties (density and viscosity), pipe characteristics (including diameter, length, and surface roughness), and the flow rate or average velocity are...
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Pipe Flowrate Measurement01:28

Pipe Flowrate Measurement

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In pipe flow measurement, orifice, nozzle, and Venturi meters are commonly used to determine fluid flowrates by constricting the flow area, which increases fluid velocity and reduces pressure. This pressure difference, governed by Bernoulli's principle and adjusted for real-world conditions, is essential for calculating flowrate. Each meter type is suited to specific applications based on accuracy, efficiency, and compatibility with various flow conditions.
The orifice meter is a simple,...
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Pipe Flowrate Measurement: Problem Solving01:28

Pipe Flowrate Measurement: Problem Solving

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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 achieved...
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Poiseuille's Law and Reynolds Number01:10

Poiseuille's Law and Reynolds Number

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Any fluid in a horizontal tube can flow due to pressure differences—fluid flows from high to low pressure. The flow rate (Q) is the ratio of pressure difference and resistance through a horizontal tube. The greater the pressure difference, the higher the flow rate. The flow resistance is expressed as:
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Updated: Jan 12, 2026

In Vitro Model of Physiological and Pathological Blood Flow with Application to Investigations of Vascular Cell Remodeling
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预测和降低流量率脉动的策略,在一个旋转环静电与新管设计的旋转环静电.

Alexandros Anastasiadis1,2, Nikolaos Rogkas3, Achileas Tsoukalis4

  • 1Laboratory of Machine Design and Dynamics, National Technical University of Athens, Athens, Greece.

Medical & biological engineering & computing
|October 30, 2025
PubMed
概括

这项研究使用优化的几何形状和外修改,将周围静止流量脉冲降低了23%. 这些改进对于药物输注和心肺绕道等医疗应用至关重要,最大限度地减少液体应变和潜在的血液溶解.

关键词:
弹性管道 弹性管道流量 流量 流量 流量 流量环静脉是一个环静脉.脉动的流动是脉动的流动.模拟模拟是为了模拟.

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科学领域:

  • 生物医学工程 生物医学工程
  • 流体动力学 流体动力学
  • 医疗器械设计 医疗器械设计

背景情况:

  • 在医疗应用中 (例如心肺绕道,药物输注) 由于无接触液体处理和精确的流量控制,周围至关重要.
  • 环静脉中固有的流动脉冲可能会导致血液中血液溶解等不良影响.
  • 了解和减轻这些脉冲对于提高医疗流体输送系统的安全性和有效性至关重要.

研究的目的:

  • 研究围静中输出质量流量率脉冲的基本机制.
  • 探索和量化减少这些流动脉冲的策略.
  • 引入一个具有成本效益的方法来估计质量流速趋势.

主要方法:

  • 在现实的操作条件下使用优化的管体几何学进行了3D流体结构相互作用 (FSI) 模拟.
  • 监测了滚筒前后的压力变化,以与流速波动相关联.
  • 分析了几何参数 (滚筒直径,管度,曲率) 和外支对流动脉动的影响.

主要成果:

  • 确定了滚筒脱离过程中的压力变化与质量流速的短暂下降之间的直接相关性.
  • 优化滚筒直径减少了20%的流动脉冲;管壁硬度和曲率半径的影响最小.
  • 在出口附近移除外部体支,通过更顺的滚筒解锁,流量脉冲降低了高达23%.

结论:

  • 优化的几何设计和战略性外改造可以有效地减少周静止流动脉冲.
  • 这些发现为改善周围在关键医疗应用中的性能和可靠性提供了实际策略.
  • 一种经过验证的体积方法为估计质量流量率提供了一个可行的替代方案,补充了CFD分析.