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Related Concept Videos

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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...
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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
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A high-pressure bi-directional cycloid rotor flowmeter.

Shuo Liu1, Fan Ding2, Chuan Ding3

  • 1The State Key Lab of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China. liushuo@sina.com.

Sensors (Basel, Switzerland)
|September 9, 2014
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Summary

This study introduces a high-pressure rotary positive displacement meter (PD meter) with cycloid rotors. The innovative design achieves high accuracy (±0.5%) and low pressure loss for industrial flow measurement.

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Area of Science:

  • Mechanical Engineering
  • Fluid Dynamics
  • Industrial Automation

Background:

  • Accurate flow rate measurement is essential for industrial automation, particularly in custody transfer and hydraulic control.
  • Rotary positive displacement (PD) meters are recognized for their high accuracy in these applications.

Purpose of the Study:

  • To present a novel high-pressure rotary PD meter design utilizing internal cycloid rotors.
  • To evaluate the performance characteristics, including accuracy and pressure loss, of the developed cycloid rotor flowmeter.

Main Methods:

  • Design and fabrication of a prototype high-pressure rotary PD meter with equidistant curtate epicycloid internal rotors.
  • Experimental validation of the flowmeter's performance across a flow range of 1-100 L/min.
  • Analysis of the calculation method for determining the displacement of the cycloid rotor flowmeter.

Main Results:

  • The fabricated prototype demonstrated high accuracy with relative errors below ±0.5% within the tested flow range.
  • The flowmeter exhibited low pressure loss, approximately 3 bar at a flow rate of 100 L/min.
  • The design offers advantages such as a concise structure, low noise, and high accuracy.

Conclusions:

  • The developed high-pressure rotary PD meter with cycloid rotors is a viable solution for accurate industrial flow measurement.
  • The design's combination of high accuracy, low pressure loss, and structural simplicity makes it suitable for demanding applications.
  • Further research can explore optimization of the cycloid rotor geometry for enhanced performance across wider flow conditions.