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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

Published on: March 12, 2019

Uniform supersonic flow sampling for detection by chirped-pulse rotational spectroscopy.

Ranil M Gurusinghe¹, Nureshan Dias¹, Ritter Krueger¹

¹Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA.

The Journal of Chemical Physics

|January 9, 2022

Summary

This study introduces a new setup combining airfoil sampling with chirped-pulse microwave (CP-MW) detection for uniform supersonic flows. This method enables microsecond-timescale measurements of low-temperature reaction kinetics.

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Area of Science:

Chemical Physics
Spectroscopy
Physical Chemistry

Background:

Chirped-pulse Fourier transform microwave (CP-FTMW) spectroscopy is a versatile detection technique.
Previous coupling with supersonic flows (CPUF) faced limitations in sensitivity at high densities.
Uniform supersonic flows are crucial for accurate low-temperature kinetics studies.

Purpose of the Study:

To develop a new setup combining airfoil sampling with CP-FTMW detection for uniform supersonic flows.
To enable sensitive, high-resolution kinetic measurements at low temperatures.
To validate the performance of the new setup for chemical kinetics.

Main Methods:

Integration of an airfoil-shaped sampling device with a chirped-pulse millimeter-wave (mmW) detector.
Utilizing UV photodissociation of probe molecules (pyridine, vinyl cyanide) to diagnose flow uniformity.
Performing kinetics measurements of the CN + C2H6 reaction at 50 K.

Main Results:

Demonstrated density and temperature variations in airfoil-sampled flows using rotational spectroscopy.
UV photodissociation proved effective for diagnosing flow uniformity.
Successful kinetics measurements of the CN + C2H6 reaction, detecting HCN product.

Conclusions:

Airfoil sampling combined with CP-FTMW spectroscopy enables microsecond-timescale measurements of low-temperature reaction kinetics.
The technique allows for highly specific simultaneous detection of reactants and products.
This advancement is critical for precise low-temperature chemical kinetics studies.