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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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The Side-Release Method Measures the High-Pressure Sound Velocity of Iron Using Line-Spatially Resolved DISAR.

Long Chen1, Cangli Liu1, Longhuang Tang1

  • 1National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China.

Micromachines
|September 28, 2024
PubMed
Summary

Researchers measured iron

Keywords:
laser velocimetryshock loadingsound velocitysurface structure

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Area of Science:

  • Shock wave physics
  • Geophysics
  • Solid state physics
  • Crystallography

Background:

  • Measuring high-pressure sound velocity is crucial for understanding material behavior under extreme conditions.
  • Existing methods for ultra-high pressure sound velocity measurements in metals are complex and limited, especially for simulating Earth's core conditions.
  • Current techniques struggle to achieve the high temperatures and pressures found in the Earth's inner core.

Purpose of the Study:

  • To develop and demonstrate a novel method for measuring the sound velocity of iron at ultra-high pressures and temperatures.
  • To overcome the limitations of current techniques in simulating extreme terrestrial environments.
  • To provide a feasible route for high spatiotemporal resolution velocity measurements.

Main Methods:

  • Utilized a two-stage light gas cannon experimental platform to achieve high-pressure conditions (78 GPa).
  • Employed the side-side sparse wave method coupled with a high-spatially resolved optical group and fiber bundle.
  • Developed and implemented a multiplexed all-fiber laser interferometry velocity measurement system (DISAR) with spatial resolution better than 20 μm.

Main Results:

  • Successfully measured the sound velocity of iron under high temperature and high-pressure (78 GPa) conditions.
  • Achieved high spatiotemporal resolution in velocity measurements, exceeding previous limitations.
  • Demonstrated the effectiveness of the DISAR system in extreme environments.

Conclusions:

  • The developed method provides a viable approach for measuring iron's sound velocity at extreme pressures and temperatures.
  • This technique advances the study of shock wave physics and materials science under deep-Earth conditions.
  • The high spatiotemporal resolution velocity measurement system offers a new tool for dynamic material characterization.