SPEED OF SOUND MEASURMENTS IN GASEOUS BINARYMIXTURES OF CARBON DIOXIDE + ISOBUTANE
The speed of sound was measured in binary mixtures of CO2 and isobutane with CO2 mole fractions of x1=0.53147 and x1=0.73597 along three isotherms from 310 to 330 K and pressures up to 1 MPa by means of a cylindrical resonator whose length and radius were calibrated with argon. The pure longitudinal frequency modes (200), (300) and (400) were used to calculate the speed of sound. The thermal and viscosity boundary disturbances were considered and corrected in the frequency measurements. The experimental uncertainties in the temperature, pressure, mole fraction and speed of sound for the binary mixture were estimated to be not greater than ±5 mK, ±200 Pa, ±0.0001 and 0.01％, respectively. The ideal gas specific heats and the acoustic virial coefficients were then deduced from the speed of sound data. The second density virial coefficients, B(T), were obtained from the acoustic data and square-well intermolecular model.
carbon dioxide isobutane speed of sound cylindrical resonator virial coefficient
Qiang Liu Xiaojuan Feng Mengxia Zhou Yuanyuan Duan
Key Laboratory of Thermal Science and Power Engineering of Ministry of Education Tsinghua University, Beijing 100084, P.R. China
国际会议
The Ninth Asian Thermophysical Properties Conference(第九届亚洲热物理性能会议 ATPC 2010)
北京
英文
954-961
2010-10-19（万方平台首次上网日期，不代表论文的发表时间）