Speed of Sound and Ideal-Gas Heat Capacity at Constant Pressure for HFC-125  

作　　者：张昌 段远源 王鑫 朱明善 

出　　处：《Tsinghua Science and Technology》2001年第5期479-483,共5页清华大学学报（自然科学版（英文版）

基　　金：Supported by the National Natural Science Foundation of China( No. 5 990 60 0 6)

摘　　要：The gaseous speed of sound, the ideal gas heat capacity at constant pressure, and the second Virial coefficient were determined for pentafluoroethane (HFC 125). A total of 49 data points of speed of sound for gaseous HFC 125 were measured for temperatures from 273 to 313 K and pressures from 32 to 479 kPa with a cylindrical, variable path acoustic interferometer. The ideal gas heat capacity at constant pressure and the second acoustic Virial coefficient were determined over the temperature range from the speed of sound measurements and were correlated as functions of temperature. An analytical expression for the second Virial coefficient derived using the square well intermolecular potential model was compared with the data.The gaseous speed of sound, the ideal gas heat capacity at constant pressure, and the second Virial coefficient were determined for pentafluoroethane (HFC 125). A total of 49 data points of speed of sound for gaseous HFC 125 were measured for temperatures from 273 to 313 K and pressures from 32 to 479 kPa with a cylindrical, variable path acoustic interferometer. The ideal gas heat capacity at constant pressure and the second acoustic Virial coefficient were determined over the temperature range from the speed of sound measurements and were correlated as functions of temperature. An analytical expression for the second Virial coefficient derived using the square well intermolecular potential model was compared with the data.

关 键 词：pentafluoroethane   (HFC  125) speed of sound ideal  gas heat capacity at constant pressure second Virial coefficient 

分 类 号：TK121[动力工程及工程热物理—工程热物理]