Ultrasonic Velocity in Carbon Dioxide and Ethylene in the Critical Region

1940 ◽  
Vol 8 (7) ◽  
pp. 537-542 ◽  
Author(s):  
Carl M. Herget
Keyword(s):  
Carbon Dioxide ◽  
Ultrasonic Velocity ◽  
Critical Region

Ultrasonic velocity in liquid carbon dioxide

Physica ◽  
1973 ◽  
Vol 63 (1) ◽  
pp. 154-162 ◽  
Author(s):  
W. Pecceu ◽  
W. Van Dael
Keyword(s):  
Carbon Dioxide ◽  
Ultrasonic Velocity ◽  
Liquid Carbon ◽  
Liquid Carbon Dioxide

Computation of Thermodynamic Properties of Carbon Dioxide in the Range 0–750 Deg C

1970 ◽  
Vol 92 (3) ◽  
pp. 301-309 ◽  
Author(s):  
G. Angelino ◽  
E. Macchi
Keyword(s):  
Carbon Dioxide ◽  
Thermal Properties ◽  
High Temperature ◽  
Thermodynamic Properties ◽  
Thermodynamic Functions ◽  
Critical Region ◽  
Density Measurement ◽  
Working Fluid ◽  
Power Cycles ◽  
Wide Range

The computation of power cycles employing carbon dioxide as working fluid and extending down to the critical region requires the knowledge of the thermodynamic properties of CO2 within a wide range of pressures and temperatures. Available data are recognized to be insufficient or insufficiently accurate chiefly in the vicinity of the critical dome. Newly published density and specific heat measurements are employed to compute thermodynamic functions at temperatures between 0 and 50 deg C, where the need of better data is more urgent. Methods for the computation of thermal properties from density measurement in the low and in the high temperature range are presented and discussed. Results are reported of the computation of entropy and enthalpy of CO2 in the range 150–750 deg C and 40–600 atm. The probable precision of the tables is inferred from an error analysis based on the generation, by means of a computer program of a set of pseudoexperimental points which, treated as actual measurements, yield useful information about the accuracy of the calculation procedure.

Equations of state and thermodynamic properties of carbon dioxide and argon in the critical region

1991 ◽  
Vol 61 (1) ◽  
pp. 902-908 ◽  
Author(s):  
Kh. S. Abdulkadirova ◽  
S. B. Kiselev ◽  
I. G. Kostyukova ◽  
L. V. Fedyunina
Keyword(s):  
Carbon Dioxide ◽  
Thermodynamic Properties ◽  
Critical Region ◽  
Equations Of State

THE VISCOSITY OF CARBON DIOXIDE IN THE CRITICAL REGION

1940 ◽  
Vol 18b (10) ◽  
pp. 322-332 ◽  
Author(s):  
S. N. Naldrett ◽  
O. Maass
Keyword(s):  
Carbon Dioxide ◽  
Critical Temperature ◽  
Lower Limit ◽  
Critical Region ◽  
Liquid State ◽  
Condensation Temperature ◽  
Constant Density ◽  
Time Lags ◽  
Great Precision ◽  
Temperature Time

Measurements of the viscosity of carbon dioxide in the critical region have been made with great precision by means of an oscillating disc viscosimeter. The variation of viscosity with temperature at constant density has been determined for 14 different densities. Isothermals have been evaluated from a plot of the isochores. One isothermal was determined directly and is in agreement with those determined indirectly.The form of the viscosity-temperature isochores is not the same as that found by Mason and Maass (12) for ethylene, in that there is no minimum at the critical temperature nor even up to 7 °C. above. For the region just above the condensation temperature, the viscosity is more dependent on density than on temperature; the isochores are almost flat and are well separated. However, the isothermals are spread between an upper and a lower limit of density, showing that viscosity is not entirely independent of temperature. Time lags were observed in the present investigation in the opposite direction to those observed by Geddes and Maass (9); this would appear to decrease the strength of their claims that the time lags that they observed are due to the formation of a structure in the liquid state.

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