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| Exploration of experimental method for measuring gaseous viscosity using acoustic method |
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Abstract In response to the problem that traditional viscosity measurement methods cannot meet the requirements of high-precision and thermodynamic equilibrium gas-phase viscosity measurement, it is proposed to use acoustic methods to measure gas-phase viscosity. Acoustic method obtains gas-phase viscosity by generating resonance within the resonant chamber and analyzing the mechanism of acoustic energy dissipation. By utilizing a specially designed dual chamber structure, the proportion of viscous dissipation in acoustic energy dissipation was greatly increased, allowing viscosity to be obtained from the frequency response of the resonant chamber. The basic principles and viscosity correction methods of acoustic method for measuring gas-phase viscosity were preliminarily explored. The dissipation of acoustic energy is mainly caused by the viscous boundary layer, thermal boundary layer, and cavity volume effect. The inverse quality factor method can be used to correct the gas-phase viscosity for thermal boundary layer and cavity volume effect, obtaining more accurate gas-phase viscosity. On this basis, a complete gas-phase viscosity measurement experimental system was established, which includes a dual resonant chamber experimental body, a resonance frequency measurement system, a temperature measurement and control system, and a pressure measurement and gas distribution system, laying an experimental foundation for high-precision measurement of gas-phase viscosity in the future.
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Received: 29 October 2024
Published: 03 April 2025
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2025, Vol. 46 
