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Related Concept Videos

Pipe Flowrate Measurement01:28

Pipe Flowrate Measurement

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.
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Note: Ultrasonic liquid flow meter for small pipes.

Yang Yu1, Guanghua Zong

  • 1Robotics Institute, Beihang University, Beijing 100191, China.

The Review of Scientific Instruments
|March 3, 2012
PubMed
Summary
This summary is machine-generated.

This study presents an ultrasonic flow meter for small pipes, overcoming challenges with clamp-on meters. A novel design using a 45° tee achieves high accuracy for precise flow measurement.

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Area of Science:

  • Fluid mechanics
  • Measurement science and technology

Background:

  • Clamp-on ultrasonic flow meters struggle with small metal pipes (<10 mm) due to crosstalk and short acoustic paths.
  • Axial inline flow meters offer an alternative but require precise transducer port positioning.

Purpose of the Study:

  • To develop and validate an accurate ultrasonic flow meter for small diameter pipes.
  • To investigate the impact of pipe connecting tee geometry on flow meter performance.

Main Methods:

  • Computational Fluid Dynamics (CFD) was used to compare three pipe connecting tee designs.
  • A prototype ultrasonic flow meter incorporating a 45° tee was constructed and experimentally tested.
  • Flow meter performance was evaluated through zero flow tests and calibration.

Main Results:

  • CFD analysis indicated a 45° tee provides a more uniform velocity distribution in the measurement section.
  • The prototype flow meter exhibited minimal zero flow shift (max 0.002 m/s over 24 h).
  • Post-calibration, the flow meter achieved an inaccuracy below 0.1% of reading across a range of 15-150 g/s.

Conclusions:

  • The developed axial inline ultrasonic flow meter with a 45° tee design effectively addresses challenges in small pipe flow measurement.
  • The optimized design demonstrates high accuracy and stability, suitable for precise flow rate determination.