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Vladimir G. Baidakov - One of the best experts on this subject based on the ideXlab platform.
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Capillary Constant and surface tension of propane (R-290) with small additives of hydrogen
Fuel, 2021Co-Authors: Valentina N. Andbaeva, Vladimir G. BaidakovAbstract:Abstract A differential variant of the Capillary rise method was used to measure the Capillary Constant and to determine the surface tension of a propane (R-290) + hydrogen system. The measurements were carried out for 13 isotherms in the temperature range 95–355 K at pressures from the saturated vapor pressure of pure propane up to 4 MPa. Equations are proposed that describe the concentration and pressure dependences of the Capillary Constant and surface tension. It is shown that an increase in the concentration of hydrogen in the solution leads to a decrease both of the Capillary Constant and the surface tension.
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Capillary Constant and surface tension of liquefied gases saturated with helium
Fluid Phase Equilibria, 2019Co-Authors: Vladimir G. BaidakovAbstract:Abstract The effect of helium on the Capillary Constant and surface tension of liquefied gases is examined. Experimental data are analyzed in the framework of the finite thickness layer method. It is noted that owing to its low solubility and considerable surface activity, helium, depending on the kind of solvent and state parameters, may act as a surface-active and an inactive substance. The possibility to use the concept of thermodynamic similarity in describing the properties of the liquid–gas interface in solutions is discussed.
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Capillary Constant and surface tension of methane/hydrogen mixtures
Fuel, 2017Co-Authors: Vladimir G. Baidakov, Aleksey M. Kaverin, Ksenia A. GrishinaAbstract:Abstract Methane/hydrogen mixtures are a promising kind of fuel for automobile, water and railway transport, supersonic aircraft, and rocket engineering. We have used the differential Capillary method to measure the Capillary Constant a 2 and calculate the surface tension σ in the temperature range from 95 to 176 K and the pressure range from that of the saturated vapors of pure methane to 4 MPa. Equations have been derived which describe the temperature, baric and concentration dependences of a 2 and σ . The adsorption has been determined. The results of measurements are discussed in the framework of thermodynamic models of the theory of surface phenomena.
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Capillary Constant and surface tension of ethane with small additions of hydrogen
Fuel, 2017Co-Authors: Vladimir G. Baidakov, Ksenia A. Grishina, Maria N. KhotienkovaAbstract:Abstract One of the ways of increasing the ecological and economic performance of internal combustion engines is the addition of small amounts of hydrogen to hydrocarbon fuel. We used the differential Capillary method to measure the Capillary Constant a 2 and to determine the surface tension σ of ethane/hydrogen mixtures. Experiments were conducted in the temperature range from 93.15 to 283.15 K at pressures from that of the phase equilibrium of pure ethane to 4 MPa. The values of a 2 and σ as functions of the temperature, pressure and concentration of hydrogen are described by analytical dependences. The effect of the nature of the substance being dissolved and the nonideality of the forming mixture on the value of its surface tension has been examined.
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Surface tension of methane–nitrogen solutions: 2. Description in the framework of the van der Waals gradient theory
Fluid Phase Equilibria, 2016Co-Authors: Vladimir G. Baidakov, Maria N. KhotienkovaAbstract:Abstract Surface tension, adsorption, partial profiles of density, the position of dividing surfaces in the interfacial layer and the Tolman length of methane–nitrogen solutions have been calculated in the context of the van der Waals gradient theory (GT). Equations of state have been built up for pure methane and nitrogen, which describe stable, metastable and unstable regions and parameters of liquid-gas phase equilibrium. A one-liquid model of a solution has been used for determining the density of the Helmholtz free energy of a homogeneous system. The influence parameters of methane and nitrogen have been calculated from data on their surface tension. It has been found that in a first approximation they are independent of temperature. The problem of determination of the mixture cross influence parameter is discussed. The results of calculations of surface tension are compared with experimental data [V.G. Baidakov, M.N. Khotienkova, V.N. Andbaeva, A.M. Kaverin. Capillary Constant and surface tension of methane–nitrogen solutions: 1. Experiment. Fluid Phase Equilib. 301 (2011) 67–72].
Maria N. Khotienkova - One of the best experts on this subject based on the ideXlab platform.
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Capillary Constant and surface tension of ethane with small additions of hydrogen
Fuel, 2017Co-Authors: Vladimir G. Baidakov, Ksenia A. Grishina, Maria N. KhotienkovaAbstract:Abstract One of the ways of increasing the ecological and economic performance of internal combustion engines is the addition of small amounts of hydrogen to hydrocarbon fuel. We used the differential Capillary method to measure the Capillary Constant a 2 and to determine the surface tension σ of ethane/hydrogen mixtures. Experiments were conducted in the temperature range from 93.15 to 283.15 K at pressures from that of the phase equilibrium of pure ethane to 4 MPa. The values of a 2 and σ as functions of the temperature, pressure and concentration of hydrogen are described by analytical dependences. The effect of the nature of the substance being dissolved and the nonideality of the forming mixture on the value of its surface tension has been examined.
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surface tension of methane nitrogen solutions 2 description in the framework of the van der waals gradient theory
Fluid Phase Equilibria, 2016Co-Authors: V G Baidakov, Maria N. KhotienkovaAbstract:Abstract Surface tension, adsorption, partial profiles of density, the position of dividing surfaces in the interfacial layer and the Tolman length of methane–nitrogen solutions have been calculated in the context of the van der Waals gradient theory (GT). Equations of state have been built up for pure methane and nitrogen, which describe stable, metastable and unstable regions and parameters of liquid-gas phase equilibrium. A one-liquid model of a solution has been used for determining the density of the Helmholtz free energy of a homogeneous system. The influence parameters of methane and nitrogen have been calculated from data on their surface tension. It has been found that in a first approximation they are independent of temperature. The problem of determination of the mixture cross influence parameter is discussed. The results of calculations of surface tension are compared with experimental data [V.G. Baidakov, M.N. Khotienkova, V.N. Andbaeva, A.M. Kaverin. Capillary Constant and surface tension of methane–nitrogen solutions: 1. Experiment. Fluid Phase Equilib. 301 (2011) 67–72].
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Surface tension of methane–nitrogen solutions: 2. Description in the framework of the van der Waals gradient theory
Fluid Phase Equilibria, 2016Co-Authors: Vladimir G. Baidakov, Maria N. KhotienkovaAbstract:Abstract Surface tension, adsorption, partial profiles of density, the position of dividing surfaces in the interfacial layer and the Tolman length of methane–nitrogen solutions have been calculated in the context of the van der Waals gradient theory (GT). Equations of state have been built up for pure methane and nitrogen, which describe stable, metastable and unstable regions and parameters of liquid-gas phase equilibrium. A one-liquid model of a solution has been used for determining the density of the Helmholtz free energy of a homogeneous system. The influence parameters of methane and nitrogen have been calculated from data on their surface tension. It has been found that in a first approximation they are independent of temperature. The problem of determination of the mixture cross influence parameter is discussed. The results of calculations of surface tension are compared with experimental data [V.G. Baidakov, M.N. Khotienkova, V.N. Andbaeva, A.M. Kaverin. Capillary Constant and surface tension of methane–nitrogen solutions: 1. Experiment. Fluid Phase Equilib. 301 (2011) 67–72].
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Surface tension of an ethane–nitrogen solution. 1: Experiment and thermodynamic analysis of the results
Fluid Phase Equilibria, 2012Co-Authors: Vladimir G. Baidakov, Aleksey M. Kaverin, Maria N. Khotienkova, Valentina N. AndbaevaAbstract:Abstract The differential variation of the method of Capillary rise has been employed to measure the Capillary Constant and calculate the surface tension of ethane–nitrogen solutions. Experiments have been conducted in the temperature range from 93.15 K to 283.15 K at pressures up to 4 MPa. The (p, T)-projection of the line of three-phase liquid–liquid–vapor equilibrium and the surface tension at a liquid–vapor interface close to this line have been determined. Equations are developed which describe the dependence of the Capillary Constant and the surface tension on the temperature, pressure, and composition of the liquid phase. Experimental data on the surface tension are analyzed in the framework of thermodynamic models.
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Capillary Constant of a Xenon–Helium Solution
Journal of Chemical & Engineering Data, 2011Co-Authors: Vladimir G. Baidakov, Aleksey M. Kaverin, Valentina N. Andbaeva, Maria N. KhotienkovaAbstract:The differential Capillary method has been used to measure the Capillary Constant of a xenon–helium solution. Experiments have been conducted in the temperature range from (165 to 267) K at pressures up to 4 MPa. An equation approximating the baric dependence of the Capillary Constant has been suggested.
Aleksey M. Kaverin - One of the best experts on this subject based on the ideXlab platform.
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Capillary Constant and surface tension of methane hydrogen mixtures
Fuel, 2017Co-Authors: V G Baidakov, Aleksey M. Kaverin, Ksenia A. GrishinaAbstract:Abstract Methane/hydrogen mixtures are a promising kind of fuel for automobile, water and railway transport, supersonic aircraft, and rocket engineering. We have used the differential Capillary method to measure the Capillary Constant a 2 and calculate the surface tension σ in the temperature range from 95 to 176 K and the pressure range from that of the saturated vapors of pure methane to 4 MPa. Equations have been derived which describe the temperature, baric and concentration dependences of a 2 and σ . The adsorption has been determined. The results of measurements are discussed in the framework of thermodynamic models of the theory of surface phenomena.
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Capillary Constant and surface tension of methane/hydrogen mixtures
Fuel, 2017Co-Authors: Vladimir G. Baidakov, Aleksey M. Kaverin, Ksenia A. GrishinaAbstract:Abstract Methane/hydrogen mixtures are a promising kind of fuel for automobile, water and railway transport, supersonic aircraft, and rocket engineering. We have used the differential Capillary method to measure the Capillary Constant a 2 and calculate the surface tension σ in the temperature range from 95 to 176 K and the pressure range from that of the saturated vapors of pure methane to 4 MPa. Equations have been derived which describe the temperature, baric and concentration dependences of a 2 and σ . The adsorption has been determined. The results of measurements are discussed in the framework of thermodynamic models of the theory of surface phenomena.
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Capillary Constant and surface tension of dimethyl ether and n butane at temperatures from 214 k to those close to the critical point
Fluid Phase Equilibria, 2016Co-Authors: V G Baidakov, Ksenia A. Grishina, Aleksey M. KaverinAbstract:Abstract The Capillary Constant a2 has been measured by the differential Capillary-rise technique and the surface tension σ of dimethyl ether and n-butane has been determined with the use of data on the densities of saturated liquid and gas. The experiments with dimethyl ether were performed at temperatures from 214 K to 390 K, for n-butane – from 278.15 K to 423.04 K. Equations that approximate the temperature dependences of a2 and σ have been suggested.
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Surface tension of an ethane–nitrogen solution. 1: Experiment and thermodynamic analysis of the results
Fluid Phase Equilibria, 2012Co-Authors: Vladimir G. Baidakov, Aleksey M. Kaverin, Maria N. Khotienkova, Valentina N. AndbaevaAbstract:Abstract The differential variation of the method of Capillary rise has been employed to measure the Capillary Constant and calculate the surface tension of ethane–nitrogen solutions. Experiments have been conducted in the temperature range from 93.15 K to 283.15 K at pressures up to 4 MPa. The (p, T)-projection of the line of three-phase liquid–liquid–vapor equilibrium and the surface tension at a liquid–vapor interface close to this line have been determined. Equations are developed which describe the dependence of the Capillary Constant and the surface tension on the temperature, pressure, and composition of the liquid phase. Experimental data on the surface tension are analyzed in the framework of thermodynamic models.
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Capillary Constant of a Xenon–Helium Solution
Journal of Chemical & Engineering Data, 2011Co-Authors: Vladimir G. Baidakov, Aleksey M. Kaverin, Valentina N. Andbaeva, Maria N. KhotienkovaAbstract:The differential Capillary method has been used to measure the Capillary Constant of a xenon–helium solution. Experiments have been conducted in the temperature range from (165 to 267) K at pressures up to 4 MPa. An equation approximating the baric dependence of the Capillary Constant has been suggested.
Valentina N. Andbaeva - One of the best experts on this subject based on the ideXlab platform.
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Capillary Constant and surface tension of propane (R-290) with small additives of hydrogen
Fuel, 2021Co-Authors: Valentina N. Andbaeva, Vladimir G. BaidakovAbstract:Abstract A differential variant of the Capillary rise method was used to measure the Capillary Constant and to determine the surface tension of a propane (R-290) + hydrogen system. The measurements were carried out for 13 isotherms in the temperature range 95–355 K at pressures from the saturated vapor pressure of pure propane up to 4 MPa. Equations are proposed that describe the concentration and pressure dependences of the Capillary Constant and surface tension. It is shown that an increase in the concentration of hydrogen in the solution leads to a decrease both of the Capillary Constant and the surface tension.
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Surface tension of an ethane–nitrogen solution. 1: Experiment and thermodynamic analysis of the results
Fluid Phase Equilibria, 2012Co-Authors: Vladimir G. Baidakov, Aleksey M. Kaverin, Maria N. Khotienkova, Valentina N. AndbaevaAbstract:Abstract The differential variation of the method of Capillary rise has been employed to measure the Capillary Constant and calculate the surface tension of ethane–nitrogen solutions. Experiments have been conducted in the temperature range from 93.15 K to 283.15 K at pressures up to 4 MPa. The (p, T)-projection of the line of three-phase liquid–liquid–vapor equilibrium and the surface tension at a liquid–vapor interface close to this line have been determined. Equations are developed which describe the dependence of the Capillary Constant and the surface tension on the temperature, pressure, and composition of the liquid phase. Experimental data on the surface tension are analyzed in the framework of thermodynamic models.
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Capillary Constant of a Xenon–Helium Solution
Journal of Chemical & Engineering Data, 2011Co-Authors: Vladimir G. Baidakov, Aleksey M. Kaverin, Valentina N. Andbaeva, Maria N. KhotienkovaAbstract:The differential Capillary method has been used to measure the Capillary Constant of a xenon–helium solution. Experiments have been conducted in the temperature range from (165 to 267) K at pressures up to 4 MPa. An equation approximating the baric dependence of the Capillary Constant has been suggested.
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Capillary Constant of a xenon helium solution
Journal of Chemical & Engineering Data, 2011Co-Authors: Vladimir G. Baidakov, Aleksey M. Kaverin, Valentina N. Andbaeva, Maria N. KhotienkovaAbstract:The differential Capillary method has been used to measure the Capillary Constant of a xenon–helium solution. Experiments have been conducted in the temperature range from (165 to 267) K at pressures up to 4 MPa. An equation approximating the baric dependence of the Capillary Constant has been suggested.
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Capillary Constant and surface tension of methane-nitrogen solutions: 1. Experiment
Fluid Phase Equilibria, 2011Co-Authors: Vladimir G. Baidakov, Valentina N. Andbaeva, Maria N. Khotienkova, Aleksey M. KaverinAbstract:Abstract The differential version of the method of Capillary rise has been used to measure the Capillary Constant and calculate the surface tension of methane–nitrogen solutions. Experiments have been conducted in the temperature range from 95 to 170 K at pressures up to 4 MPa. Experimental data on surface tension have been compared with the results of calculations by thermodynamic models. Equations are given which describe the dependence of the Capillary Constant of a solution on its temperature and composition.
V G Baidakov - One of the best experts on this subject based on the ideXlab platform.
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Capillary Constant and surface tension of propane (R-290) with helium dissolved in it
International Journal of Refrigeration, 2019Co-Authors: V G Baidakov, M.n. KhotienkovaAbstract:Abstract The differential Capillary method is employed for the measurement of the Capillary Constant. Based on the knowledge of this parameter, the surface tension of propane (R-290) + helium is calculated. The measurements are performed in a temperature interval from 120 to 350 K at pressures in the range from the saturation pressure of pure propane up to 4 MPa. Equations are proposed for the dependence of the surface tension on temperature, pressure, and concentration. It is shown that in the considered range of values of the parameters small additions of helium into propane may lead both to a decrease and an increase of the surface tension of the solution.
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Capillary Constant and surface tension of methane hydrogen mixtures
Fuel, 2017Co-Authors: V G Baidakov, Aleksey M. Kaverin, Ksenia A. GrishinaAbstract:Abstract Methane/hydrogen mixtures are a promising kind of fuel for automobile, water and railway transport, supersonic aircraft, and rocket engineering. We have used the differential Capillary method to measure the Capillary Constant a 2 and calculate the surface tension σ in the temperature range from 95 to 176 K and the pressure range from that of the saturated vapors of pure methane to 4 MPa. Equations have been derived which describe the temperature, baric and concentration dependences of a 2 and σ . The adsorption has been determined. The results of measurements are discussed in the framework of thermodynamic models of the theory of surface phenomena.
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surface tension of methane nitrogen solutions 2 description in the framework of the van der waals gradient theory
Fluid Phase Equilibria, 2016Co-Authors: V G Baidakov, Maria N. KhotienkovaAbstract:Abstract Surface tension, adsorption, partial profiles of density, the position of dividing surfaces in the interfacial layer and the Tolman length of methane–nitrogen solutions have been calculated in the context of the van der Waals gradient theory (GT). Equations of state have been built up for pure methane and nitrogen, which describe stable, metastable and unstable regions and parameters of liquid-gas phase equilibrium. A one-liquid model of a solution has been used for determining the density of the Helmholtz free energy of a homogeneous system. The influence parameters of methane and nitrogen have been calculated from data on their surface tension. It has been found that in a first approximation they are independent of temperature. The problem of determination of the mixture cross influence parameter is discussed. The results of calculations of surface tension are compared with experimental data [V.G. Baidakov, M.N. Khotienkova, V.N. Andbaeva, A.M. Kaverin. Capillary Constant and surface tension of methane–nitrogen solutions: 1. Experiment. Fluid Phase Equilib. 301 (2011) 67–72].
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Capillary Constant and surface tension of dimethyl ether and n butane at temperatures from 214 k to those close to the critical point
Fluid Phase Equilibria, 2016Co-Authors: V G Baidakov, Ksenia A. Grishina, Aleksey M. KaverinAbstract:Abstract The Capillary Constant a2 has been measured by the differential Capillary-rise technique and the surface tension σ of dimethyl ether and n-butane has been determined with the use of data on the densities of saturated liquid and gas. The experiments with dimethyl ether were performed at temperatures from 214 K to 390 K, for n-butane – from 278.15 K to 423.04 K. Equations that approximate the temperature dependences of a2 and σ have been suggested.
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Surface tension of dimethyl ether in the temperature range 120–214 K
Russian Journal of Physical Chemistry A, 2015Co-Authors: V G Baidakov, A. M. Kaverin, K. A. GrishinaAbstract:The Capillary Constant a ^2 was measured by the differential Capillary method of surface tension measurement. The surface tension σ of dimethyl ether was calculated. The experiments were performed both above the triple point temperature ( T _ t = 131.66 K) and below it in the range in which the coexisting liquid and gas are metastable. Equations that approximate the temperature dependences of a ^2 and σ were suggested. The excess surface entropy and energy were determined. The surface entropy had a maximum at T ≈ 190 K.
