scholarly journals Velocity of sound in liquid argon at high pressures and temperatures

1968 ◽  
Vol 46 (8) ◽  
pp. 1175-1180 ◽  
Author(s):  
D. H. Bowman ◽  
C. C. Lim ◽  
R. A. Aziz
Keyword(s):  
Specific Heat ◽  
High Pressures ◽  
Constant Pressure ◽  
Liquid Argon ◽  
Velocity Versus ◽  
Velocity Of Sound ◽  
Temperature Analysis ◽  
Density Data ◽  
Specific Heat Ratio ◽  
High Pressures And Temperatures

Measurements were made of the velocity of sound in liquid argon in the temperature range 86–146 °K and at pressures up to 65 atm. The velocity versus pressure isotherms are steeper and more curved at the higher temperatures. At any one pressure, the velocity is a smoothly decreasing function of temperature. Analysis of the results using existing density data showed that the specific heat ratio, γ, decreases with pressure and increases with temperature in this range. The coefficient in Rao's relation was found to increase with temperature at constant pressure, while that in the relation due to Carnevale and Litovitz exhibited no definite trend with temperature or pressure.

Clement-Desormes Measurements in Low-Pressure Superheated Steam

1972 ◽  
Vol 94 (3) ◽  
pp. 956-958
Author(s):  
J. H. Potter
Keyword(s):  
Specific Heat ◽  
Superheated Steam ◽  
Low Pressure ◽  
Velocity Of Sound ◽  
Free Expansion ◽  
Specific Heat Ratio

The specific heat ratio γ, was measured in low-pressure superheated steam, using a modified form of the free expansion experiment performed originally by Clement and Desormes. Values for γ are compared to those obtained from velocity of sound experiments, and to those calculated from the equations used in the ASME Steam Tables of 1967.

FIRST SOUND IN LIQUID HELIUM AT HIGH PRESSURES

1953 ◽  
Vol 31 (7) ◽  
pp. 1156-1164 ◽  
Author(s):  
K. R. Atkins ◽  
R. A. Stasior
Keyword(s):  
Specific Heat ◽  
Liquid Helium ◽  
Carrier Frequency ◽  
High Pressures ◽  
Constant Pressure ◽  
Constant Density ◽  
Pulse Technique ◽  
Temperature Range ◽  
Specific Heats ◽  
First Sound

The velocity of ordinary sound in liquid helium has been measured in the temperature range from 1.2 °K. to 4.2 °K. at pressures up to 69 atm. A pulse technique was used with a carrier frequency of 12 Mc.p.s. Curves are given for the variation of velocity with temperature at constant pressure and also at constant density. There is no detectable discontinuity along the λ-curve. The results are used to discuss the ratio of the specific heats, the coefficient of expansion below 0.6 °K., and the specific heat above 3 °K.

Evaluation of a Steam Jet Refrigerator with the Varying Specific Heat Ratio

2013 ◽  
Vol 385-386 ◽  
pp. 220-224
Author(s):  
Wen Bin Cui ◽  
Feng Min Su ◽  
Hai Jun Li
Keyword(s):  
Specific Heat ◽  
Constant Pressure ◽  
Refrigeration System ◽  
Analysis Model ◽  
Working Process ◽  
Specific Heat Ratio ◽  
Simulation Results ◽  
Working Performance

To predict the working performance of the jet refrigeration system more precisely, including the condensing temperature and coefficients of performance, this paper presents a 1-D analysis model with the varying specific heat ratio. During the evaluation, the working process of the constant pressure ejector is divided into three sections with different specific heat ratios. By comparing the results from Eames experiment, the simulation results indicate that this model is more reasonable, and the error of the simulation is within 20%, which is significantly smaller than the error of Eames model at 40%.

Wide-range equations of state for organic liquids

2007 ◽  
Vol 5 ◽  
pp. 113-120 ◽  
Author(s):  
R.Kh. Bolotnova
Keyword(s):  
High Pressures ◽  
Equations Of State ◽  
Organic Liquids ◽  
Liquid Phases ◽  
Wide Range ◽  
High Pressures And Temperatures

The method of construction the wide-range equations of state for organic liquids, describing the gas and liquid phases including dissociation and ionization which occurs during an intense collapse of steam bubbles and accompanied by ultra-high pressures and temperatures, is proposed.

A Rational Equation of State for Water and Water Vapor in the Critical Region

1964 ◽  
Vol 86 (3) ◽  
pp. 320-326 ◽  
Author(s):  
E. S. Nowak
Keyword(s):  
Water Vapor ◽  
Equation Of State ◽  
Thermodynamic Properties ◽  
Specific Heat ◽  
Critical Point ◽  
Critical Region ◽  
Constant Pressure ◽  
Parametric Equation ◽  
Enthalpy And Entropy ◽  
Specific Volumes

A parametric equation of state was derived for water and water vapor in the critical region from experimental P-V-T data. It is valid in that part of the critical region encompassed by pressures from 3000 to 4000 psia, specific volumes from 0.0400 to 0.1100 ft3/lb, and temperatures from 698 to 752 deg F. The equation of state satisfies all of the known conditions at the critical point. It also satisfies the conditions along certain of the boundaries which probably separate “supercritical liquid” from “supercritical vapor.” The equation of state, though quite simple in form, is probably superior to any equation heretofore derived for water and water vapor in the critical region. Specifically, the deviations between the measured and computed values of pressure in the large majority of the cases were within three parts in one thousand. This coincides approximately with the overall uncertainty in P-V-T measurements. In view of these factors, the author recommends that the equation be used to derive values for such thermodynamic properties as specific heat at constant pressure, enthalpy, and entropy in the critical region.

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