Isothermal compressibility and internal pressure of 1-butanol + 1,3-butanediol at the temperature 298.15 K determined by an acoustic method

2008 ◽  
Vol 154 (1) ◽  
pp. 295-299 ◽  
Author(s):  
E. Zorebski
Keyword(s):  
Internal Pressure ◽  
Isothermal Compressibility ◽  
Acoustic Method

scholarly journals Thermodynamic properties of standard seawater

2009 ◽  
Vol 6 (1) ◽  
pp. 689-722 ◽  
Author(s):  
J. Safarov ◽  
F. Millero ◽  
R. Feistel ◽  
A. Heintz ◽  
E. Hassel
Keyword(s):  
Equation Of State ◽  
Thermodynamic Properties ◽  
Internal Pressure ◽  
Isothermal Compressibility ◽  
Pressure Coefficient ◽  
Standard Uncertainty ◽  
Volumetric Properties ◽  
Distilled Water ◽  
Thermal Pressure ◽  
Higher Temperature

Abstract. (p, ρ, T) data of standard seawater with practical salinity S≈35 (corresponding to an absolute salinity SA≈35.16504 g/kg) measured at T=(273.14 to 468.06) K and pressures up to p=140 MPa are reported with an estimated experimental relative combined standard uncertainty of 0.006% in density. The measurements were made with a newly constructed vibration-tube densimeter. The system was calibrated using double-distilled water, methanol and aqueous NaCl solutions. An empirical correlation for the density of standard seawater has been developed as a function of pressure and temperature. This equation of state was used to calculate other volumetric properties such as isothermal compressibility, isobaric thermal expansibility, differences in isobaric and isochoric heat capacities, thermal pressure coefficient, internal pressure and secant bulk modulus. The results can be used to extend the present equation of state of seawater to higher temperature as a function of pressure.

Thermodynamic properties of 1,1,1,2-tetrafluoroethane + polyether mixtures up to 60 MPa

2004 ◽  
Vol 82 (8) ◽  
pp. 1271-1279 ◽  
Author(s):  
M JP Comuñas ◽  
C Boned ◽  
A Baylaucq ◽  
E R López ◽  
J Fernández
Keyword(s):  
Thermal Expansion ◽  
Thermodynamic Properties ◽  
Internal Pressure ◽  
Thermal Expansion Coefficient ◽  
Dimethyl Ether ◽  
Expansion Coefficient ◽  
Isothermal Compressibility ◽  
Isobaric Thermal Expansion ◽  
Hfc 134A ◽  
Isobaric Thermal Expansion Coefficient

In this work we report several derived thermodynamic properties, the isothermal compressibility (κT), the isobaric thermal expansion coefficient (αp), and the internal pressure (π), and their excess functions (κTE, αpE, and πE) for the refrigerant + lubricant mixtures HFC-134a + triethylene glycol dimethyl ether and HFC-134a + tetraethylene glycol dimethyl ether. These properties have been determined in wide temperature (293.15–373.15 K) and pressure (10–60 MPa) ranges in an effort to better understand the behaviour of these kinds of mixtures and their thermophysical properties as functions of temperature, pressure, and composition. The analysis of the thermodynamic excess properties (negative values for κTE and αpE, positive values for πE) for both systems shows a high degree of interaction between the refrigerant and the synthetic lubricant molecules. Key words: HFC-134a, high pressure, internal pressure, isobaric thermal expansion coefficient, isothermal compressibility, polyglycol ethers, refrigerant–lubricant mixtures.

scholarly journals DETERMINATION OF THE NONLINEAR PARAMETER AND INTERNAL PRESSURE IN A LIQUID BY THE ACOUSTIC METHOD

2021 ◽  
Vol 1 (63) ◽  
pp. 88-94
Author(s):  
Jr. Dudzinskii ◽  
◽  
N. Titova ◽  
N. Manicheva ◽  
A. Zakharova ◽  
...  
Keyword(s):  
Internal Pressure ◽  
Medical Devices ◽  
Harmonic Wave ◽  
Wave Interaction ◽  
Acoustic Method ◽  
Finite Amplitude ◽  
Nonlinear Parameter ◽  
Resonance Frequencies ◽  
Intermolecular Distances

An acoustic method is proposed for assessing the molecular properties of a liquid, determining the nonlinear parameter of liquids from the ratio of the first and second harmonics when the acoustic wave changes, and using this parameter to measure the internal pressure. In addition, the proposed method measures intermolecular distances for the studied liquids. In organ fluids, the effects of sound scattering and wave interaction are enhanced. In body fluids, at the molecular level, there is a small amount of microscopic bubbles. This leads to the appearance of the phenomenon of cavitation. These phenomena can be harmful, but not always. There are devices for biological and pharmaceutical technologies, medical devices that successfully use these effects. The paper presents a functional diagram of the experiment, identifies the oscillograms of acoustic signals of finite amplitude at different distances from the emitter. The same devices based on quartz plates 25 mm in diameter with a resonance frequency of 3 MHz were used as the emitter and receiver. This difference of approximately three times the resonance frequencies of the sensors and the acoustic signal ensures the linearity of the amplitude-frequency response of both sensors. Nonlinear acoustic methods are a global trend in biomedical research, as they open up new opportunities and prospects in the development of medical devices. The appearance of higher harmonics in the curvature of the initial harmonic wave of finite amplitude can be used for express analysis of the physical properties of pure liquids and especially aqueous solutions of organic substances. This method of experimental determination of the nonlinear parameter and internal pressure in a liquid is more convenient than the static one, since it does not require the use of high excess static pressures. The proposed acoustic method gives less error than the dynamic one. The accuracy of such a determination can be sufficient to judge the change in the intermolecular interaction in liquids.

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