Abstract
A novel method of determining the local mole fraction in a binary mixture from the visualization of a shock reflection was developed and tested in a shock tube. Incident and reflected shock wave velocities extracted from high-speed shadowgraphy and surface pressure data obtained from piezoelectric pressure sensors were used in combination with classical shock theory to perform the measurements. The mole fraction was determined from the analysis of the mixture properties, including the specific heat capacity and molecular weight. The sensitivity of measurement uncertainty to the camera resolution and framing rate was analyzed. Based on shock tube tests of helium–nitrogen mixtures, the accuracy of the mole fraction measurement technique is 4%.
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The authors would like to acknowledge Defence Research and Development Canada (DRDC) for loaning the shock tube for these experiments.
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Edwards, J.L., Hinman, W.S. & Johansen, C.T. Extracting mole fraction measurements from the visualization of a shock reflection. J Vis 22, 35–49 (2019). https://doi.org/10.1007/s12650-018-0527-x
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DOI: https://doi.org/10.1007/s12650-018-0527-x