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Related Experiment Video

Updated: Jan 15, 2026

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Published on: August 1, 2017

Optical Temperature Measurement in Unsteady Plasma Free Jet.

Tobias Hermann¹, Eric Won Keun Chang¹

¹Oxford Thermofluids Institute, University of Oxford, Southwell Building, Osney Mead, Oxford OX2 0ES, UK.

Measurement Science & Technology

|October 13, 2025

Summary

This summary is machine-generated.

High-speed imaging reveals turbulent fluctuations in an Argon plasma free jet. Unsteady flow analysis accurately models temperature and jet width, unlike steady-state models which overestimate key parameters.

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Area of Science:

Plasma Physics
Fluid Dynamics
Optical Diagnostics

Background:

Argon plasma free jets are crucial in various industrial and research applications.
Understanding their turbulent behavior and thermal properties is essential for process optimization.
Previous studies often simplified flow dynamics, potentially leading to inaccuracies.

Purpose of the Study:

To investigate the behavior of an Argon plasma free jet using advanced imaging techniques.
To quantify the impact of turbulent fluctuations on plasma temperature and jet width.
To compare the accuracy of steady and unsteady flow models in describing the jet's characteristics.

Main Methods:

High-speed imaging at 16kHz with spectrally narrow bandpass filtering.
Absolute radiance calibration for quantitative image analysis.
Application of local thermodynamic equilibrium and self-similar profile assumptions.
Development and comparison of steady and unsteady flow models.

Main Results:

The Argon plasma free jet exhibits turbulent free shear flow behavior with axisymmetric shape.
Fluctuations increase in strength and size downstream, impacting measurements.
Steady flow models overestimate temperature (32%), jet width (18%), and power (41%) in high-fluctuation regions.
Unsteady analysis yields lower temperatures and jet widths, conserving momentum and energy.

Conclusions:

Unsteady flow analysis is critical for accurately characterizing turbulent plasma jets.
Steady-state assumptions lead to significant overestimations in key plasma parameters.
Accurate modeling of fluctuations is vital for reliable plasma jet diagnostics and applications.