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Spherical acoustic resonators for temperature and thermophysical property measurements



Michael R. Moldover, Martin Greenspan, Meyer Waxman


A theoretical and experimental study is reported of the advantages and limitations of using the acoustic radial resonances in a spherical cavity to obtain thermophysical property data in dilute gases. The velocity of sound in dilute gases (0.1-0.5 MPA) is now measured with an accuracy of 0.02% and a precision of 0.001%, and a significant increase in accuracy is anticipated. The measurements are at sufficiently low frequencies (3-15 kHz) to be of value in determining thermophysical properties in many polyatomic gases.
High Temperatures - High Pressures
Created November 1, 1979, Updated January 19, 2018