M B Ewing et al 1986 Metrologia 22 93 doi:10.1088/0026-1394/22/2/004
M B Ewing1, M L McGlashan1 and J P M Trusler1,2
Show affiliationsThe theory of the thermal boundary layer at the walls of a spherical acoustic resonator is discussed in detail. For gases at low pressures, the temperature-jump effect is found to make a significant contribution to the resonance frequencies of the radial modes but not to their acoustic losses. Experimental results are reported for argon at 273.16 K and pressures between 15 and 248 kPa, and compared with the theory. These were obtained using the four radial modes with lowest frequency of a spherical resonator with a radius of 60 mm. The thermal accommodation coefficient between argon and the aluminium wall of the resonator was found to be (0.84 ± 0.05). The results suggest that a determination of the gas constant with a fractional imprecision of 1 × 10-5 or better should be possible using a spherical acoustic resonator.
Issue 2 (1986)
Received 11 July 1985
M B Ewing et al 1986 Metrologia 22 93
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