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Real-time method for NO(2) flow measurements.

R C Darrah1, M L Andrews, A Garscadden

  • 1Universal Energy Systems, Dayton, Ohio 45432Southeastern Center for Electrical Engineering Education, Auburn, Alabama 36830Air Force Aero Propulsion Lab., Wright-Patterson AFB, Dayton, Ohio 45432.

The Review of Scientific Instruments
|July 1, 1978
PubMed
Summary
This summary is machine-generated.

This study presents a method for real-time nitrogen dioxide (NO2) flow measurement using a variable area flow meter. The technique avoids calibration and achieves a measurement error below 7%.

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Area of Science:

  • Chemical Engineering
  • Fluid Dynamics
  • Analytical Chemistry

Background:

  • Accurate measurement of gas flows is critical in various chemical processes.
  • Traditional flow meters often require specific calibration for different gases.
  • Nitrogen dioxide (NO2) and its equilibrium with dinitrogen tetroxide (N2O4) present unique challenges for flow measurement due to their properties.

Purpose of the Study:

  • To develop a method for real-time NO2 flow measurement without prior experimental calibration.
  • To present the parameters and calculations for determining the viscosity and density of N2O4/2NO2 gas mixtures.
  • To assess the error limits associated with the proposed flow measurement technique.

Main Methods:

  • Utilized a tapered, variable area flow meter equipped with a diameter ratio scale.
  • Calculated key fluid properties including viscosity and density for the N2O4/2NO2 gas.
  • Analyzed error sources, including parameter uncertainties and controlled flow conditions.

Main Results:

  • Real-time NO2 flow measurements were achieved without requiring flow meter calibration.
  • The study details the necessary calculations for gas viscosity and density.
  • The overall measurement error, excluding scale reading error, was determined to be less than 7%.

Conclusions:

  • The developed method provides a reliable approach for NO2 flow measurement.
  • The technique is advantageous as it bypasses the need for gas-specific calibration.
  • The low error margin demonstrates the practical applicability of this method in relevant scientific and industrial settings.