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Speed-of-sound measurement of R245fa in the gas phase by using a cylindrical acoustic resonator.
Number: pap. n. TP-081
Author(s) : KANO Y., KAYUKAWA Y.
Summary
Speed-of-Sound of R245fa (1,1,1,3,3-pentafluolopropane) in the gas phase were measured by using a cylindrical acoustic resonator. Two commercially available capacitive microphones, one is the transmitter and the other is the receiver, are coaxially put on the each side end-plate of the cylindrical resonator. The sample gas is filled in the resonator, then the transmitter microphone transmits audio frequency sound signal into the resonator. The sound wave propagating in the sample gas is detected by the receiver microphone and its amplifier and phase-shift are measured with a frequency response analyzer. The speed-of-sound data are obtained by measuring the acoustic resonance frequencies in the longitudinal modes. The dimensions of the cylindrical cavity, whose length and diameter of about 50 mm and 24 mm, respectively, were determined by measuring microwave resonance under vacuum. Correcting some frequency perturbations such as the thermal and viscous boundary layers vicinity on the cavity wall, the speed-of-sound are determined with a relative uncertainty less than 0.1 %. Based on the measured speed-of-sound data, the acoustic virial equation was formulated and the isobaric heat capacities in ideal gas state were determined.
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Details
- Original title: Speed-of-sound measurement of R245fa in the gas phase by using a cylindrical acoustic resonator.
- Record ID : 30008308
- Languages: English
- Source: 4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
- Publication date: 2013/06/17
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Indexing
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Themes:
Thermodynamic measurements;
HFCs - Keywords: R245fa; Gas; Measurement; Sound velocity; Acoustics
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