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相关概念视频

Couette Flow01:22

Couette Flow

206
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
206
Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

147
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...
147
Coulometry: Overview01:00

Coulometry: Overview

1.0K
Coulometry is one of the rapid, most accurate, and precise analytical techniques that determine the quantity of an analyte by measuring the electrical charge needed for its complete electrolysis without using any analytical standards. The total charge passed during electrolysis correlates with the analyte amount by Faraday's laws of electrolysis. For accurate coulometric measurements, a charge equal to Faraday's constant multiplied by the number of electrons involved in the relevant...
1.0K
Constant Pressure Calorimetry03:02

Constant Pressure Calorimetry

84.7K
Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
84.7K
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

132
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.
132
Poiseuille's Law and Reynolds Number01:10

Poiseuille's Law and Reynolds Number

6.3K
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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相关实验视频

Updated: Jun 5, 2025

Rapid Viscoelastic Characterization of Airway Mucus Using a Benchtop Rheometer
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Rapid Viscoelastic Characterization of Airway Mucus Using a Benchtop Rheometer

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一个低成本的,开源的圆柱形Couette风力计.

Makita Erni1, A John Hart2, David Trumper2

  • 1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA. merni@alum.mit.edu.

Scientific reports
|December 5, 2024
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种低成本的开源风力计 (OSR),使用3D打印进行可访问的流体流量分析. 该设备准确地测量粘度和复杂的流体行为,为教育和研究民主化了类风学测试.

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科学领域:

  • 材料科学与工程 材料科学与工程
  • 流体动力学 流体动力学
  • 仪器化 仪器化 仪器化

背景情况:

  • 风病学,研究流体流动,对于各种应用至关重要,但往往需要昂贵,复杂的设备.
  • 由于成本,尺寸和基础设施需求,许多人无法获得传统的风湿计.
  • 简单的粘度测量无法捕捉到许多现实世界流体的复杂行为.

研究的目的:

  • 引入一个低成本的,开源的风湿计 (OSR) 可访问的风湿测量.
  • 为了证明OSR在测量牛顿和复杂流体属性的能力.
  • 为了提供一个平台,以进一步创新在负担得起的类风湿学.

主要方法:

  • 使用3D打印部件和现成组件构建了一个开源风湿计 (OSR),材料成本低于200美元.
  • 采用了应变控制的剪流方法,其中微型步进电机在液体样本中旋转一个工具.
  • 使用负载电池测量反应扭矩,以计算粘度和其他神经学参数.

主要成果:

  • 在测量牛顿流体 (0.1-10 Pa.s) 与基准值相比时,OSR的误差低于23%.
  • 复杂液体 (微凝,泡,生物聚合物溶液) 的流量曲线在类似的误差范围内成功测量.
  • 证明过渡性测量,包括对生物聚合物溶液的应力放松,提取非线性缓冲函数.

结论:

  • OSR提供了一种具有成本效益的替代方案 (商业设备价格的1/25).
  • 该开源平台可用于教育和研究目的的广泛采用和定制.
  • OSR成功地弥合了先进流体表征的可访问性差距.