Determination of the second virial coefficient for working fluid using a cylindrical resonator

The acoustic resonance frequencies were measured for argon from 270 to 333.15 K and pressures up to 1000 kPa using a cylindrical resonator.The perturbations in frequency measurements from thermal and viscous boundary layers,the fill duct and shell motions were corrected.The second acoustic virial coefficients were obtained by fitting the measured acoustic data.The results agree well with the experimental results by using spherical resonators.The second virial coefficients were determined by fitting the second acoustic virial coefficient and the square-well intermolecular model.The deviation of this work from the calculated value using the equation of state developed by Tegeler et al.is lower than 0.4 cm3·mol-1.The results show that the second virial coefficient can be determined using cylindrical resonators with low uncertainties.