Interfacial Tension and Density of Water + Branched Hydrocarbon Binary Systems in the Range 303−343 K

2009 ◽  
Vol 48 (3) ◽  
pp. 1476-1483 ◽  
Author(s):  
Carlos Gilberto Aranda-Bravo ◽  
Ascención Romero-Martínez ◽  
Arturo Trejo ◽  
Jacinto Águila-Hernández
Keyword(s):  
Interfacial Tension ◽  
Binary Systems ◽  
Density Of Water

Interfacial Tension in Binary Systems Containing a Dense Gas

1994 ◽  
pp. 731-738
Author(s):  
S. Peter ◽  
A. Blaha-Schnabel ◽  
H. Schiemann ◽  
E. Weidner
Keyword(s):  
Interfacial Tension ◽  
Binary Systems ◽  
Dense Gas

Interfacial tension in binary systems containing a dense gas

1993 ◽  
Vol 6 (3) ◽  
pp. 181-189 ◽  
Author(s):  
Hartmut Schiemann ◽  
Eckhard Weidner ◽  
Siegfried Peter
Keyword(s):  
Interfacial Tension ◽  
Binary Systems ◽  
Dense Gas

Correlations of Equilibrium Interfacial Tension Based on Mutual Solubility/Density: Extension to n-Alkane–Water and n-Alkane–CO2 Binary/Ternary Systems and Comparisons With the Parachor Model

2019 ◽  
Vol 141 (12) ◽  
Author(s):  
Zehua Chen ◽  
Daoyong Yang
Keyword(s):  
Interfacial Tension ◽  
Binary Systems ◽  
Ternary Systems ◽  
Liquid System ◽  
Mutual Solubility ◽  
Density Difference ◽  
Petroleum Engineering ◽  
Liquid Density ◽  
Relative Deviation ◽  
Two Phases

In this study, new and pragmatic interfacial tension (IFT) correlations for n-alkane–water and n-alkane–CO2 systems are developed based on the mutual solubility of the corresponding binary systems and/or density in a pressure range of 0.1–140.0 MPa and temperature range of 283.2–473.2 K. In addition to being more accurate (i.e., the absolute average relative deviation (AARD) is 1.96% for alkane–water systems, while the AARDs for alkane–CO2 systems are 8.52% and 25.40% in the IFT range of >5.0 mN/m and 0.1–5.0 mN/m, respectively) than either the existing correlations or the parachor model (the AARDs for alkane–CO2 systems are 12.78% and 35.15% in the IFT range of >5.0 mN/m and 0.1–5.0 mN/m, respectively), such correlations can be applied to the corresponding ternary systems for an accurate IFT prediction without any mixing rule. Both a higher mutual solubility and a lower density difference between two phases involved can lead to a lower IFT, while pressure and temperature exert effects on IFT mainly through regulating the mutual solubility/density. Without taking effects of mutual solubility into account, the widely used parachor model in chemical and petroleum engineering fails to predict the IFT for CO2/methane–water pair and n-alkane–water pairs, though it yields a rough estimate for the CO2–water and methane–water pair below the CO2 and methane critical pressures of 7.38 and 4.59 MPa, respectively. However, the parachor model at least considers the effects of solubility in the alkane-rich phase to make it much accurate for n-alkane–CO2 systems. For n-alkane–CO2 pairs, the correlations developed in this work are found to be much less sensitive to the liquid density than the parachor model, being more convenient for practical use. In addition, all the IFTs for the CO2–water pair, methane–water pair, and alkane–CO2 pair can be regressed as a function of density difference of a gas–liquid system with a high accuracy at pressures lower than the critical pressures of either CO2 or methane.

Correlation of Surface and Interfacial Tension of Light Hydrocarbons in the Critical Region

1961 ◽  
Vol 1 (04) ◽  
pp. 259-263 ◽  
Author(s):  
E.W. Hough ◽  
G.L. Stegemeier
Keyword(s):  
Experimental Data ◽  
Surface Tension ◽  
Interfacial Tension ◽  
Critical Pressure ◽  
Binary Systems ◽  
Gas Oil ◽  
Light Hydrocarbons ◽  
Two Phase ◽  
Component Systems ◽  
Two Phases

Abstract Empirical equations for surface tension of propane and normal butane as functions of reduced temperature are obtained from experimental data. Another correlation relating surface tension to enthalpy of vaporization is given for these two compounds. In addition, new parachor numbers are calculated for the normal paraffin hydrocarbons. These numbers are utilized for the calculation of interfacial tension of two-component systems as functions of pressure and temperature, using a modified form of Weinaug-Katz equation. The experimental data for two binary systems are approximated by the correlation. From these results it is found that the inter facial tension in the high-pressure region remains extremely low at large pressure decrements below the critical pressure. Thus, it appears that condensate systems may have flow characteristics almost like single-phase conditions even though the pressure is within the two-phase region. Experimental data have shown that interfacial tension divided by density difference approaches zero as the critical pressure is approached. A calculation of wetting-phase saturations indicates that the saturation gradient at the two-phase contact becomes increasingly abrupt as the critical pressure is approached. Discussion Prediction of the surface and interfacial tension of the light hydrocarbons and of two-component hydrocarbon mixtures at various temperatures and pressures may be made if other physical properties are known. Extensive experimental work on single-component and binary systems is the basis for the correlations outlined in this paper. Interfacial tension is defined as the specific surface-free energy between two phases of unlike fractional composition, while surface tension is defined as the specific surface-free energy between two phases of the same fractional composition. The usual definitions relating interfacial tension to a liquid-liquid interface and surface tension to a gas-liquid interface are not clearly defined when the critical region is included, and there is no sharp distinction between a gas and a liquid phase. Interfacial tension is probably the most important single force that makes one-half to one-third of the total oil actually in place in a reservoir rock unrecoverable by conventional gas-drive or waterflood methods. A rough estimate of this figure for the United States is 100 billion bbl. Interfacial tension presently is used by petroleum engineers in the estimation of saturation gradients at the gas-oil contact and at the oil-water contact. The data in this paper should prove useful for estimates of reserves involving gas-oil contacts. Relative permeability undoubtedly is influenced by interfacial tension, for sufficiently small values. These data should be useful in determining how small the values are. In addition, these data should eventually add to our fundamental knowledge of surfaces. At the critical point, all surface excesses approach zero and the thickness becomes very large. SINGLE-COMPONENT SYSTEMS It has been observed that the following relationships are good approximations to the physical properties of propane and n-butane. For propane, For n-butane, Guggenheim's values for these constants, not specifically for hydrocarbons, are SPEJ P. 259^

Some Results of the Spectroscopic Study of Four Close Binary Systems of Early Spectral Types

1965 ◽  
Vol 5 ◽  
pp. 120-130
Author(s):  
T. S. Galkina
Keyword(s):  
Spectroscopic Study ◽  
Spectral Type ◽  
Spectroscopic Investigation ◽  
Binary Systems ◽  
Quantitative Information ◽  
Close Binary ◽  
Physical Parameters ◽  
Absorption And Emission ◽  
Close Binary Systems ◽  
Quantitative Estimates

It is necessary to have quantitative estimates of the intensity of lines (both absorption and emission) to obtain the physical parameters of the atmosphere of components.Some years ago at the Crimean observatory we began the spectroscopic investigation of close binary systems of the early spectral type with components WR, Of, O, B to try and obtain more quantitative information from the study of the spectra of the components.

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