Victor Yesavage - Academia.edu (original) (raw)

Papers by Victor Yesavage

Research paper thumbnail of Compilation of parameters for a polar fluid Soave-Redlich-Kwong equation of state

Industrial & Engineering Chemistry Process Design and Development, 1986

Recently, a four-parameter extension of the Soave-Rediich-Kwong equation of state was proposed fo... more Recently, a four-parameter extension of the Soave-Rediich-Kwong equation of state was proposed for modeling polar fluids. Use of this equation requires two additional empirical correlating parameters in addition to the critical temperature and pressure. This paper presents a discussion of correlating techniques and a compilation of these two parameters for 286 organic and inorganic systems obtained by fitting vapor pressure data. Resuits of this study indicate that when the parameters that are presented are used, the modification of the Soave equation can be used to reliably calculate vapor pressures of nonpolar, polar, and even associating fluids, such as water and alcohols.

Research paper thumbnail of Enthalpy data for a mixture containing 28 mole percent propane in methane

Research paper thumbnail of The measurement and prediction of the enthalpy of fluid mixtures under pressure

Research paper thumbnail of Lakatos bibliography

Research paper thumbnail of An automated flow calorimeter for the determination of liquid and vapor isobaric heat capacities: Test results for water and n‐pentane

Review of Scientific Instruments, 1992

An automated flow calorimeter has been developed for the measurement of highly accurate isobaric ... more An automated flow calorimeter has been developed for the measurement of highly accurate isobaric heat capacities and enthalpies of fluids at elevated temperatures and pressures. The instrument was successfully tested over the range 300–600 K and 0–12 MPa and is readily extensible to 700 K and 30 MPa. The flow calorimeter relied on an adiabatic design with a two-chambered cell design incorporating several concentric shells of active and passive shields designed to minimize heat losses, facilitate easy component replacement, and eliminate any external temperature regulation baths. A pair of miniature standard platinum resistance thermometers were built to determine the differential calorimeter temperatures. A precision metering pump eliminated the need for direct mass flow-rate determinations while a complete automation system supplied all of the required data acquisition, monitoring, and control (except for pressure) resources necessary to operate the calorimeter and make measurements from a single personal computer. Measurements of isobaric heat capacities were performed on water (liq.) and n-pentane (liq. and vap.) to test the new calorimeter. These experiments compared well with the published values, indicating an overall measurement precision of 0.1% and uncertainty in the range of 0.2%–0.3%. The total calorimeter heat leak was small affecting the experimental uncertainty as much as the combined mass flow-rate and calorimeter temperature difference errors.

Research paper thumbnail of A New Fluorimetric Method of Plasma Cortisol Assay with a Study of Pituitary—Adrenal Function Using Metyrapone (Su. 4885)

Journal of Endocrinology, 1963

SUMMARY To assay falling cortisol levels in the plasma during intravenous metyrapone infusion, a ... more SUMMARY To assay falling cortisol levels in the plasma during intravenous metyrapone infusion, a new spectrophoto-fluorimetric method has been devised. The advantages of this method are its ability to estimate low concentrations of cortisol, its precision, the small volumes of plasma required (1·0 ml.) and the rapidity with which results may be obtained (3–4 hr.). The metyrapone test has been applied to discover its value as a clinical test of pituitary—adrenal function following steroid therapy, before subjecting patients to the stress of surgery. Tests were made on seven normal subjects, and fourteen patients with ulcerative colitis of whom eight had received steroids previously. Three patients in the steroid-treated group and one who had not received steroids previously failed to show a normal response. When subjected to operation, all four showed the usual elevation of plasma cortisol during operative stress. None of those having a normal response to the metyrapone test failed t...

Research paper thumbnail of Development of a perturbed hard sphere equation of state for non-polar and for polar/associating fluids

Fluid Phase Equilibria, 1989

ABSTRACT A perturbed hard sphere equation of state was developed for both non-polar and polar ass... more ABSTRACT A perturbed hard sphere equation of state was developed for both non-polar and polar associating fluids. First, a hard sphere equation of state, based on the Carnahan-Starling equation, with an empirical mean field attractive term was developed for non-polar fluids. The volume dependency of the attractive term was determined in order to reasonably describe volumetric properties of hydrocarbons. Hard sphere based equations of state have an almost temperature independent α(T) for spherically symmetric fluids compared to cubic equations. Thus, the α(T) expression used was the product of a term representing the slight temperature dependency for spherical fluids and a term, a function of the acentric factor, representing effects of shape for non-polar fluids. For polar fluids, a third polar factor was added to α(T) that used an effective acentric factor and a polar parameter.

Research paper thumbnail of An approach for extending van der waals equations of state for polar, hydrogen bonding fluids applied to the soave equation of state

Fluid Phase Equilibria, 1986

Abstract A method is developed for extending van der Waals type equations of state to highly pola... more Abstract A method is developed for extending van der Waals type equations of state to highly polar, hydrogen bonding fluids. The method uses the acentric factor of the hydrocarbon homolog as the shape parameter and an empirical polar parameter incorporated into a closed form, temperature dependent polar correction term. When the method is applied to the Soave equation of state, a three-parameter equation of state results which reduces to the Soave equation for non-polar fluids, yet fits vapor pressures for polar fluids much better than the original equation. Furthermore, unlike other extensions applicable to polar fluids, the polar parameters obtained do seem to be related to the expected strength of polar interactions for different classes of compounds.

Research paper thumbnail of Comparison of cubic- and hard-sphere-based equations of state for associating fluid mixtures

Industrial Engineering Chemistry Research, 1990

Recently obtained enthalpy and phase behavior data a t elevated pressures and temperatures for bo... more Recently obtained enthalpy and phase behavior data a t elevated pressures and temperatures for both pure fluids and binary and ternary mixtures of m-cresol, quinoline, and tetralin, combined with phase behavior data for mixtures of methanol, n-pentane, and acetone, were used to compare variations of perturbed hard sphere (PHS) equations of state for mixtures with a typical cubic equation of state, a modified Soave-Redlich-Kwong (SRK) equation, for estimating properties of these highly nonideal systems. By fitting pure fluid vapor pressures, attractive terms, a ( T ) , were determined for the PHS equations of state, which are much more consistent with the original temperature-independent attractive parameters as suggested by van der Waals. Experimentally determined binary interaction parameters resulted in comparable phase behavior fits and predictions for both equations. However, the PHS equations of state yielded much more accurate predictions of ternary enthalpy differences than the SRK equation of state.

Research paper thumbnail of Enthalpy increments of ?xCH3(CH2)3CH3+ (1 −x)CH3OH? and of ?0.3334CH3(CH2)3CH3+ 0.3333CH3OH + 0.3333(CH3)2CO? between the temperatures 291 K and 610 K at pressures to 10 MPa

Research paper thumbnail of Enthalpy of (quinoline + 1,2,3,4-tetrahydronaphthalene) between 291 and 655 K at pressures to 10342 kPa

The Journal of Chemical Thermodynamics, Mar 1, 1988

Research paper thumbnail of Enthalpy measurements on distillate cuts of syncrudes produced from the Solvent Refined Coal processes

Industrial & Engineering Chemistry Process Design and Development, 1984

Research paper thumbnail of Enthalpies of Fluids at Elevated Pressures and Low Temperatures

Industrial & Engineering Chemistry, 1967

Research paper thumbnail of Thermal properties of propane

Page 1. LITERATURE DATA The experimental technique developed to calculate viscos-ities of ternary... more Page 1. LITERATURE DATA The experimental technique developed to calculate viscos-ities of ternary mixtures was used to check the only other available data on ternary systems. Ruby and Kawai (13) measured viscosities ...

Research paper thumbnail of A boil-off calorimeter for the measurement of the enthalpy of coal-derived liquids

Industrial & Engineering Chemistry Process Design and Development, 1984

Research paper thumbnail of Enthalpy measurements on distillates produced from a Utah coal by the Char-Oil-Energy-Development process and from a Kentucky bituminous coal by the Synthoil process

Industrial & Engineering Chemistry Process Design and Development, 1984

Research paper thumbnail of Enthalpy of (m-cresol + 1,2,3,4-tetrahydronaphthalene) between 291 and 655 K at pressures to 10342 kPa

The Journal of Chemical Thermodynamics, 1988

Enthalpy measurements were made on six mixtures (m-cresol + tetralin) along isobars from 207 to 1... more Enthalpy measurements were made on six mixtures (m-cresol + tetralin) along isobars from 207 to 10342 kPa, in the temperature range 291 to 655 K, using a reference-fluid boil-off calorimeter. For {xm-CH,C,H,OH+(l -x)&H,,}, measurements were made at x = 0.1667, 0.3333, 0.5000, 0.6667, 0.7500, and 0.8333. In addition to the direct calorimetric results, equations for the liquid and vapor enthalpies as well as ideal-gas enthalpies are reported.

Research paper thumbnail of Enthalpy of 1-methylnaphthalene between 291 and 669 K at pressures to 3240 kPa

The Journal of Chemical Thermodynamics, 1989

Experimental enthalpy measurements were made on I-methylnaphthalene along four isobars from 207 t... more Experimental enthalpy measurements were made on I-methylnaphthalene along four isobars from 207 to 3240 kPa and in the temperature range 291 to 669 K, using a reference-fluid boil-off calorimeter. In addition to the direct calorimetric results, equations for the liquid and vapor enthalpies as well as estimated values of vapor pressures, ideal-gas enthalpies, and enthalpies of vaporization are also reported.

Research paper thumbnail of Enthalpy increments of {xCH3(CH2)3CH3+ (1 −x)CH3OH} and of {0.3334CH3(CH2)3CH3+ 0.3333CH3OH + 0.3333(CH3)2CO} between the temperatures 291 K and 610 K at pressures to 10 MPa

The Journal of Chemical Thermodynamics, 1995

Research paper thumbnail of Enthalpy of quinoline between 291 and 655 K at pressures to 10342 kPa

The Journal of Chemical Thermodynamics, 1988

Experimental enthalpy measurements were made on quinoline along seven isobars from 207 to 10342 k... more Experimental enthalpy measurements were made on quinoline along seven isobars from 207 to 10342 kPa, in the temperature range 291 to 655 K, using a reference-fluid boil-off calorimeter. In addition to the direct calorimetry results, equations for the liquid and vapor enthalpies as well as estimated values of vapor pressures, ideal-gas enthalpies. and enthalpies of vaporization are also reported.

Research paper thumbnail of Compilation of parameters for a polar fluid Soave-Redlich-Kwong equation of state

Industrial & Engineering Chemistry Process Design and Development, 1986

Recently, a four-parameter extension of the Soave-Rediich-Kwong equation of state was proposed fo... more Recently, a four-parameter extension of the Soave-Rediich-Kwong equation of state was proposed for modeling polar fluids. Use of this equation requires two additional empirical correlating parameters in addition to the critical temperature and pressure. This paper presents a discussion of correlating techniques and a compilation of these two parameters for 286 organic and inorganic systems obtained by fitting vapor pressure data. Resuits of this study indicate that when the parameters that are presented are used, the modification of the Soave equation can be used to reliably calculate vapor pressures of nonpolar, polar, and even associating fluids, such as water and alcohols.

Research paper thumbnail of Enthalpy data for a mixture containing 28 mole percent propane in methane

Research paper thumbnail of The measurement and prediction of the enthalpy of fluid mixtures under pressure

Research paper thumbnail of Lakatos bibliography

Research paper thumbnail of An automated flow calorimeter for the determination of liquid and vapor isobaric heat capacities: Test results for water and n‐pentane

Review of Scientific Instruments, 1992

An automated flow calorimeter has been developed for the measurement of highly accurate isobaric ... more An automated flow calorimeter has been developed for the measurement of highly accurate isobaric heat capacities and enthalpies of fluids at elevated temperatures and pressures. The instrument was successfully tested over the range 300–600 K and 0–12 MPa and is readily extensible to 700 K and 30 MPa. The flow calorimeter relied on an adiabatic design with a two-chambered cell design incorporating several concentric shells of active and passive shields designed to minimize heat losses, facilitate easy component replacement, and eliminate any external temperature regulation baths. A pair of miniature standard platinum resistance thermometers were built to determine the differential calorimeter temperatures. A precision metering pump eliminated the need for direct mass flow-rate determinations while a complete automation system supplied all of the required data acquisition, monitoring, and control (except for pressure) resources necessary to operate the calorimeter and make measurements from a single personal computer. Measurements of isobaric heat capacities were performed on water (liq.) and n-pentane (liq. and vap.) to test the new calorimeter. These experiments compared well with the published values, indicating an overall measurement precision of 0.1% and uncertainty in the range of 0.2%–0.3%. The total calorimeter heat leak was small affecting the experimental uncertainty as much as the combined mass flow-rate and calorimeter temperature difference errors.

Research paper thumbnail of A New Fluorimetric Method of Plasma Cortisol Assay with a Study of Pituitary—Adrenal Function Using Metyrapone (Su. 4885)

Journal of Endocrinology, 1963

SUMMARY To assay falling cortisol levels in the plasma during intravenous metyrapone infusion, a ... more SUMMARY To assay falling cortisol levels in the plasma during intravenous metyrapone infusion, a new spectrophoto-fluorimetric method has been devised. The advantages of this method are its ability to estimate low concentrations of cortisol, its precision, the small volumes of plasma required (1·0 ml.) and the rapidity with which results may be obtained (3–4 hr.). The metyrapone test has been applied to discover its value as a clinical test of pituitary—adrenal function following steroid therapy, before subjecting patients to the stress of surgery. Tests were made on seven normal subjects, and fourteen patients with ulcerative colitis of whom eight had received steroids previously. Three patients in the steroid-treated group and one who had not received steroids previously failed to show a normal response. When subjected to operation, all four showed the usual elevation of plasma cortisol during operative stress. None of those having a normal response to the metyrapone test failed t...

Research paper thumbnail of Development of a perturbed hard sphere equation of state for non-polar and for polar/associating fluids

Fluid Phase Equilibria, 1989

ABSTRACT A perturbed hard sphere equation of state was developed for both non-polar and polar ass... more ABSTRACT A perturbed hard sphere equation of state was developed for both non-polar and polar associating fluids. First, a hard sphere equation of state, based on the Carnahan-Starling equation, with an empirical mean field attractive term was developed for non-polar fluids. The volume dependency of the attractive term was determined in order to reasonably describe volumetric properties of hydrocarbons. Hard sphere based equations of state have an almost temperature independent α(T) for spherically symmetric fluids compared to cubic equations. Thus, the α(T) expression used was the product of a term representing the slight temperature dependency for spherical fluids and a term, a function of the acentric factor, representing effects of shape for non-polar fluids. For polar fluids, a third polar factor was added to α(T) that used an effective acentric factor and a polar parameter.

Research paper thumbnail of An approach for extending van der waals equations of state for polar, hydrogen bonding fluids applied to the soave equation of state

Fluid Phase Equilibria, 1986

Abstract A method is developed for extending van der Waals type equations of state to highly pola... more Abstract A method is developed for extending van der Waals type equations of state to highly polar, hydrogen bonding fluids. The method uses the acentric factor of the hydrocarbon homolog as the shape parameter and an empirical polar parameter incorporated into a closed form, temperature dependent polar correction term. When the method is applied to the Soave equation of state, a three-parameter equation of state results which reduces to the Soave equation for non-polar fluids, yet fits vapor pressures for polar fluids much better than the original equation. Furthermore, unlike other extensions applicable to polar fluids, the polar parameters obtained do seem to be related to the expected strength of polar interactions for different classes of compounds.

Research paper thumbnail of Comparison of cubic- and hard-sphere-based equations of state for associating fluid mixtures

Industrial Engineering Chemistry Research, 1990

Recently obtained enthalpy and phase behavior data a t elevated pressures and temperatures for bo... more Recently obtained enthalpy and phase behavior data a t elevated pressures and temperatures for both pure fluids and binary and ternary mixtures of m-cresol, quinoline, and tetralin, combined with phase behavior data for mixtures of methanol, n-pentane, and acetone, were used to compare variations of perturbed hard sphere (PHS) equations of state for mixtures with a typical cubic equation of state, a modified Soave-Redlich-Kwong (SRK) equation, for estimating properties of these highly nonideal systems. By fitting pure fluid vapor pressures, attractive terms, a ( T ) , were determined for the PHS equations of state, which are much more consistent with the original temperature-independent attractive parameters as suggested by van der Waals. Experimentally determined binary interaction parameters resulted in comparable phase behavior fits and predictions for both equations. However, the PHS equations of state yielded much more accurate predictions of ternary enthalpy differences than the SRK equation of state.

Research paper thumbnail of Enthalpy increments of ?xCH3(CH2)3CH3+ (1 −x)CH3OH? and of ?0.3334CH3(CH2)3CH3+ 0.3333CH3OH + 0.3333(CH3)2CO? between the temperatures 291 K and 610 K at pressures to 10 MPa

Research paper thumbnail of Enthalpy of (quinoline + 1,2,3,4-tetrahydronaphthalene) between 291 and 655 K at pressures to 10342 kPa

The Journal of Chemical Thermodynamics, Mar 1, 1988

Research paper thumbnail of Enthalpy measurements on distillate cuts of syncrudes produced from the Solvent Refined Coal processes

Industrial & Engineering Chemistry Process Design and Development, 1984

Research paper thumbnail of Enthalpies of Fluids at Elevated Pressures and Low Temperatures

Industrial & Engineering Chemistry, 1967

Research paper thumbnail of Thermal properties of propane

Page 1. LITERATURE DATA The experimental technique developed to calculate viscos-ities of ternary... more Page 1. LITERATURE DATA The experimental technique developed to calculate viscos-ities of ternary mixtures was used to check the only other available data on ternary systems. Ruby and Kawai (13) measured viscosities ...

Research paper thumbnail of A boil-off calorimeter for the measurement of the enthalpy of coal-derived liquids

Industrial & Engineering Chemistry Process Design and Development, 1984

Research paper thumbnail of Enthalpy measurements on distillates produced from a Utah coal by the Char-Oil-Energy-Development process and from a Kentucky bituminous coal by the Synthoil process

Industrial & Engineering Chemistry Process Design and Development, 1984

Research paper thumbnail of Enthalpy of (m-cresol + 1,2,3,4-tetrahydronaphthalene) between 291 and 655 K at pressures to 10342 kPa

The Journal of Chemical Thermodynamics, 1988

Enthalpy measurements were made on six mixtures (m-cresol + tetralin) along isobars from 207 to 1... more Enthalpy measurements were made on six mixtures (m-cresol + tetralin) along isobars from 207 to 10342 kPa, in the temperature range 291 to 655 K, using a reference-fluid boil-off calorimeter. For {xm-CH,C,H,OH+(l -x)&H,,}, measurements were made at x = 0.1667, 0.3333, 0.5000, 0.6667, 0.7500, and 0.8333. In addition to the direct calorimetric results, equations for the liquid and vapor enthalpies as well as ideal-gas enthalpies are reported.

Research paper thumbnail of Enthalpy of 1-methylnaphthalene between 291 and 669 K at pressures to 3240 kPa

The Journal of Chemical Thermodynamics, 1989

Experimental enthalpy measurements were made on I-methylnaphthalene along four isobars from 207 t... more Experimental enthalpy measurements were made on I-methylnaphthalene along four isobars from 207 to 3240 kPa and in the temperature range 291 to 669 K, using a reference-fluid boil-off calorimeter. In addition to the direct calorimetric results, equations for the liquid and vapor enthalpies as well as estimated values of vapor pressures, ideal-gas enthalpies, and enthalpies of vaporization are also reported.

Research paper thumbnail of Enthalpy increments of {xCH3(CH2)3CH3+ (1 −x)CH3OH} and of {0.3334CH3(CH2)3CH3+ 0.3333CH3OH + 0.3333(CH3)2CO} between the temperatures 291 K and 610 K at pressures to 10 MPa

The Journal of Chemical Thermodynamics, 1995

Research paper thumbnail of Enthalpy of quinoline between 291 and 655 K at pressures to 10342 kPa

The Journal of Chemical Thermodynamics, 1988

Experimental enthalpy measurements were made on quinoline along seven isobars from 207 to 10342 k... more Experimental enthalpy measurements were made on quinoline along seven isobars from 207 to 10342 kPa, in the temperature range 291 to 655 K, using a reference-fluid boil-off calorimeter. In addition to the direct calorimetry results, equations for the liquid and vapor enthalpies as well as estimated values of vapor pressures, ideal-gas enthalpies. and enthalpies of vaporization are also reported.