Isobaric thermal expansion and isothermal compressibility of ethylbenzene + n-hexane, and + n-octane at 25 and 45�C

1989 ◽  
Vol 18 (2) ◽  
pp. 143-150 ◽  
Author(s):  
A. D. Matilla ◽  
E. Aicart ◽  
M. D�az Pe�a ◽  
G. Tardajos
Keyword(s):  
Thermal Expansion ◽  
Isothermal Compressibility ◽  
Isobaric Thermal Expansion

The Prediction of Volumes, Compressibilities and Thermal Expansion Coefficients of Hydrocarbon Mixtures

1968 ◽  
Vol 8 (02) ◽  
pp. 95-106
Author(s):  
Surjit M. Avasthi ◽  
Harvey T. Kennedy
Keyword(s):  
Thermal Expansion ◽  
Isothermal Compressibility ◽  
Absolute Deviation ◽  
Hydrocarbon Mixtures ◽  
Reservoir Performance ◽  
Thermal Expansion Coefficients ◽  
Isobaric Thermal Expansion ◽  
Volume Curve ◽  
Fluid Properties ◽  
Molal Volumes

Abstract An equation developed for gaseous hydrocarbon mixtures predicts molal volumes with an average absolute deviation of 0.73 percent when applied to 264 natural gas and condensate systems including 2,043 PVT points. Another equation developed for liquid hydrocarbon mixtures predicts molal volumes with an average absolute deviation of 1.12 percent when applied to 346 crude oil systems including 1,759 PVT points. Both equations require composition of the mixture to be expressed as mole fraction of methane through heptanes-plus, hydrogen sulfide, nitrogen and carbon dioxide, together with the characteristics of the heptanes-plus fraction in addition to the temperature and pressure. The equations cover wide ranges of the variables involved, and their accuracy is considerably better Than that of other available methods. The equations were differentiated to allow calculation of the coefficients of isothermal compressibility and isobaric thermal expansion. (In this paper the coefficient of isothermal compressibility and the coefficient of isobaric thermal expansion will be expressed as compressibility and thermal expansion coefficient, respectively.) Equations to calculate these quantities are presented. Introduction Calculations of reservoir performance for petroleum reservoirs require accurate knowledge of the volumetric behavior of hydrocarbon mixtures, both liquid and gaseous. Compressibilities are required in transient fluid flow problems, and thermal expansion coefficients are important in thermal methods of production. An accurate laboratory investigation of the PVT behavior of each reservoir fluid encountered would be costly and time consuming. For this reason various correlations for predicting fluid properties have been developed and recorded and recent literature. Correlations have been presented in the form of graphs, tables and equations. Since an increasing number of studies are being conducted with the aid of electronic computers, recent efforts have been directed toward development of correlations suitable for computer programming. Application of computers permits the use of more complex correlations which otherwise are not feasible. Moreover, methods for predicting reservoir performance, particularly those based on the compositional material balance, depend upon the capability of accurately expressing the molal volumes and other fluid properties as functions of pressure, temperature and composition. The coefficient of isothermal compressibility c is defined by(1) and can be computed from the slope of isothermal specific volume curve for each pressure. The compressibility is a point function and has the dimension of reciprocal pressure. The coefficient of isobaric thermal expansion beta is defined as(2) It is a point function and has the dimension of reciprocal temperature. The thermal expansion coefficient can be obtained from the slope of an isobaric specific volume curve for any temperature. SPEJ P. 95ˆ

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 Isobaric Thermal Expansion and Isothermal Compression of Powdered NiFe Based Alloys Studied by In-Situ EDXRD

2014 ◽  
Vol 126 (1) ◽  
pp. 128-129
Author(s):  
D. Olekšáková ◽  
J. Füzer ◽  
P. Kollár ◽  
J. Bednarčík ◽  
C. Lathe
Keyword(s):  
Thermal Expansion ◽  
Isothermal Compression ◽  
Isobaric Thermal Expansion

scholarly journals Analysis of the Raman Frequency Shifts for the Lattice Modes and Vibrons Related to the Thermodynamic Quantities in the η Phase of Solid Nitrogen

2013 ◽  
Vol 32 (4) ◽  
pp. 383-389 ◽  
Author(s):  
Hamit Yurtseven ◽  
Özge Akay
Keyword(s):  
Thermal Expansion ◽  
Specific Heat ◽  
Isothermal Compressibility ◽  
Raman Frequency ◽  
Thermodynamic Quantities ◽  
Frequency Shifts ◽  
Solid Nitrogen ◽  
Lattice Modes

AbstractThe thermodynamic quantities of the isothermal compressibility, thermal expansion and the specific heat are calculated here as a function of pressure by using the observed Raman frequencies of the lattice modes and vibrons in the η phase of solid nitrogen. The Pippard relations and their spectroscopic modifications are constructed, and the slope dP/dT is deduced from the Raman frequency shifts in this phase of N2. It is shown that the thermodynamic quantities can be predicted from the Raman frequency shifts, in particular, in the η phase of solid nitrogen.

Thermal Expansion and Isothermal Compressibility of TlGaTe2

2004 ◽  
Vol 40 (9) ◽  
pp. 924-925 ◽  
Author(s):  
E. M. Godzhaev ◽  
D. M. Kafarova
Keyword(s):  
Thermal Expansion ◽  
Isothermal Compressibility
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