A new probe technique is introduced for the measurement of concentration in binary gas flows. The new technique is demonstrated through application of the probe in a Mach 4 nonreacting jet of hydrogen injected into a nominally quiescent air environment. Previous concentration probe devices have mostly used hot wires or hot films within an aspirating probe tip. However, the new technique relies on Pitot pressure and stagnation point transient thin film heat flux probe measurements. The transient thin film heat flux probes are operated at a number of different temperatures and thereby provide stagnation temperature and heat transfer coefficient measurements with an uncertainty of around ±5 K and ±4% respectively. When the heat transfer coefficient measurements are combined with the Pitot pressure measurements, it is demonstrated that the concentration of hydrogen within the mixing jet can be deduced. The estimated uncertainty of the reported concentration measurements is approximately ±5% on a mass fraction basis.
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July 2003
Technical Papers
Concentration Probe Measurements in a Mach 4 Nonreacting Hydrogen Jet
D. R. Buttsworth,
D. R. Buttsworth
Faculty of Engineering and Surveying, University of Southern Queensland, Toowoomba, QLD 4350, Australia
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T. V. Jones
T. V. Jones
Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, UK
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D. R. Buttsworth
Faculty of Engineering and Surveying, University of Southern Queensland, Toowoomba, QLD 4350, Australia
T. V. Jones
Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, UK
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division July 5, 2001; revised manuscript received Mar. 10, 2003. Associate Editors: K. Zaman and J. Katz.
J. Fluids Eng. Jul 2003, 125(4): 628-635 (8 pages)
Published Online: August 27, 2003
Article history
Received:
July 5, 2001
Revised:
March 10, 2003
Online:
August 27, 2003
Citation
Buttsworth, D. R., and Jones, T. V. (August 27, 2003). "Concentration Probe Measurements in a Mach 4 Nonreacting Hydrogen Jet ." ASME. J. Fluids Eng. July 2003; 125(4): 628–635. https://doi.org/10.1115/1.1595671
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