The Experts below are selected from a list of 1557 Experts worldwide ranked by ideXlab platform
Mark O. Mclinden - One of the best experts on this subject based on the ideXlab platform.
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development of a new Densimeter for the combined investigation of dew point densities and sorption phenomena of fluid mixtures
Measurement Science and Technology, 2017Co-Authors: Katharina Moritz, Mark O. Mclinden, Reiner Kleinrahm, Markus RichterAbstract:For the determination of dew-point densities and pressures of fluid mixtures, a new Densimeter has been developed. The new apparatus is based on the well-established two-sinker density measurement principle with the additional capability of quantifying sorption effects. In the vicinity of the dew line, such effects cause a change in composition of the gas mixture under study, which can significantly distort accurate density measurements. The new experimental technique enables the accurate measurement of dew-point densities and pressures and the quantification of sorption effects at the same time.
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application of a two sinker Densimeter for phase equilibrium measurements a new technique for the detection of dew points and measurements on the methane propane system
The Journal of Chemical Thermodynamics, 2016Co-Authors: Mark O. Mclinden, Markus RichterAbstract:Abstract We explore a novel method for determining the dew-point density and dew-point pressure of fluid mixtures and compare it to traditional methods. The (p, ρ, T, x) behavior of three (methane + propane) mixtures was investigated with a two-sinker magnetic suspension Densimeter over the temperature range of (248.15–293.15) K; the measurements extended from low pressures into the two-phase region. The compositions of the gravimetrically prepared mixtures were (0.74977, 0.50688, and 0.26579) mole fraction methane. We analyzed isothermal data by: (1) a “traditional” analysis of the intersection of a virial fit of the (p vs. ρ) data in the single-phase region with a linear fit of the data in the two-phase region; and (2) an analysis of the adsorbed mass on the sinker surfaces. We compared these to a traditional isochoric experiment. We conclude that the “adsorbed mass” analysis of an isothermal experiment provides an accurate determination of the dew-point temperature, pressure, and density. However, a two-sinker Densimeter is required.
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thermodynamic properties of 1 1 1 2 2 4 5 5 5 nonafluoro 4 trifluoromethyl 3 pentanone vapor pressure p ρ t behavior and speed of sound measurements and an equation of state
Journal of Chemical & Engineering Data, 2015Co-Authors: Mark O. Mclinden, Richard A Perkins, Eric W Lemmon, Tara J FortinAbstract:We report comprehensive thermodynamic property measurements of 1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-pentanone. The (p, ρ, T) behavior was measured from T = (225 to 470) K with pressures up to 36 MPa with a two-sinker Densimeter. These measurements include compressed-liquid states and states in the extended critical region. The vapor-phase speed of sound was measured from T = (325 to 500) K with pressures up to 1.7 MPa with a spherical acoustic resonator. The vapor pressure was measured in the spherical resonator from T = (325 to 440) K with a static technique. The density and speed of sound of the liquid was measured from T = (278 to 308) K at atmospheric pressure (p = 83 kPa) in a benchtop instrument employing a vibrating-U-tube Densimeter and a time-of-flight speed-of-sound technique. These data, together with selected data from the fluid manufacturer, have been used to develop an equation of state explicit in the Helmholtz energy covering the fluid region. The equation of state represents...
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thermodynamic properties of 2 3 3 3 tetrafluoroprop 1 ene r1234yf vapor pressure and p ρ t measurements and an equation of state
Journal of Chemical & Engineering Data, 2011Co-Authors: Markus Richter, Mark O. Mclinden, Eric W LemmonAbstract:The p–ρ–T behavior of 2,3,3,3-tetrafluoroprop-1-ene (R1234yf) was measured from T = (232 to 400) K with pressures up to 10 MPa using a two-sinker Densimeter. The measurements extend from low-density vapor to compressed-liquid states, and include the extended critical region. Vapor pressures from T = (250 to 366) K were also measured. The expanded (k = 2) uncertainty in density is (56·10–6·ρ + 0.0014 kg·m–3) at near-ambient conditions, increasing to (99·10–6·ρ + 0.0014 kg·m–3) at T = 400 K and p = 10 MPa. The maximum uncertainties in temperature and pressure are 0.004 K and (51·10–6·p + 2.0 kPa), respectively. The analysis for density accounts for the force transmission error in the magnetic suspension coupling of the Densimeter and includes corrections for vertical density gradients in the measuring cell. These data, together with other data from the literature, have been used to develop an equation of state explicit in the Helmholtz energy covering the fluid region from T = (220 to 410) K with pressures ...
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using ab initio data to accurately determine the fourth density virial coefficient of helium
The Journal of Chemical Thermodynamics, 2010Co-Authors: Michael R Moldover, Mark O. MclindenAbstract:Abstract We combine accurate ab initio calculations of the second and third density virial coefficients, B(T) and C(T), of 4He with measurements of its (p–ρ–T) behavior to determine the fourth density virial coefficient D(T). The measurements were made with a two-sinker, magnetic-suspension Densimeter at pressures up to 38 MPa. The measurements on isotherms from T = 223 K to T = 323 K were previously published; new measurements from T = 323 K to T = 500 K are presented here. On each isotherm, a regression of the virial expansion was constrained to the ab initio values of B(T) and C(T); the regression determined D(T) as well as two apparatus-dependent parameters that compensated for systematic errors in the measurements. The percentage uncertainties of D(T) ranged from 2.6% at T = 223 K to 9.5% at T = 400 K to 24.7% at T = 500 K, where these uncertainties are expanded uncertainties with coverage factor of k = 2 corresponding to a 95% confidence interval. These uncertainties are 1/6th of the uncertainty obtained without the ab initio values of B(T) and C(T). The apparatus-dependent parameters can be used to calibrate the Densimeter, and this will reduce the uncertainty of other measurements made with this two-sinker Densimeter. The new values of D(T) will find applications in accurate gas metrology, such as a primary pressure standard based on the refractive index of helium.
Ivan Cibulka - One of the best experts on this subject based on the ideXlab platform.
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partial molar volumes and partial molar isentropic compressions of four poly ethylene glycols at infinite dilution in water at temperatures t 278 to 343 k and atmospheric pressure
Journal of Chemical & Engineering Data, 2016Co-Authors: Ivan CibulkaAbstract:Density and speed of sound data for dilute aqueous solutions of four poly(ethylene glycol) oligomers were measured using the Anton Paar DSA 5000 vibrating-tube Densimeter and sound analyzer in the temperature range from (278.15 to 343.15) K and at atmospheric pressure. Standard molar volumes and standard molar isentropic compressions were evaluated from the measured data. Present data were compared with values available for linear aliphatic polyethers and alkane-α,ω-diols and structure–property relationships were analyzed.
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partial molar volumes and partial molar isentropic compressions of three polyhydric alcohols derived from propane at infinite dilution in water at temperatures t 278 to 318 k and atmospheric pressure
Journal of Chemical & Engineering Data, 2012Co-Authors: Tomas Katriňak, Lubomir Hnědkovský, Ivan CibulkaAbstract:Density and speed of sound data for dilute aqueous solutions of three polyhydric alcohols derived from propane (propane-1,2-diol, propane-1,3-diol, propane-1,2,3-triol) were obtained using the Anton Paar DSA 5000 vibrating-tube Densimeter and sound analyzer in the temperature range from (278.15 to 318.15) K and at atmospheric pressure. Partial molar volumes at infinite dilution (standard molar volumes) and partial molar isentropic compressions at infinite dilution (standard molar isentropic compressions) were calculated from the measured data.
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partial molar volumes of selected aliphatic alcohols at infinite dilution in water at temperatures t 278 to 573 k and pressures up to 30 mpa
Journal of Chemical & Engineering Data, 2011Co-Authors: Lukas Simurka, Ivan Cibulka, Lubomir HnědkovskýAbstract:Density data for dilute aqueous solutions of four aliphatic alcohols (2,2-dimethylpropane-1-ol, 2-methylpropane-1,3-diol, 2,2-bis(hydroxymethyl)propane-1-ol, 2,2-bis(hydroxymethyl)butane-1-ol) and one ether alcohol (3,3,7,7-tetrakis(hydroxymethyl)-5-oxanonane) were obtained using both the Anton Paar DSA 5000 vibrating-tube Densimeter and the laboratory-made flow Densimeter. They are presented together with partial molar volumes at infinite dilution (standard molar volumes) calculated from the measured data. The measurements were performed at temperatures T = (278 to 573) K and at pressures up to p = 30 MPa. Trends in homologous series are discussed, and the group additivity scheme proposed recently is applied to the solutes investigated.
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an automated vibrating tube Densimeter for measurements of small density differences in dilute aqueous solutions
International Journal of Thermophysics, 2004Co-Authors: Lubomir Hnědkovský, Ivan CibulkaAbstract:The core of the automated apparatus is a high-temperature high-pressure Densimeter with a metal vibrating tube designed for accurate flow measurements of densities of liquids in the temperature range from 298 to 573 K and at pressures from 0.1 MPa up to 30 MPa. The Densimeter is being employed for a study of dilute solutions of aqueous solutions of organic substances where the density difference {solution–water} is a primary experimental quantity. Consequently, partial molar volumes of solutes at infinite dilution in water are evaluated from the measured data. Two sampling sections are connected in series in the filling line of the Densimeter. One of them is employed for manual filling of the measured sample into a sampling loop using a syringe. The other section allows fully automated measurement of up to 12 samples in one run. The recorded data are evaluated after the automated run is completed.
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a new design of a vibrating tube Densimeter and partial molar volumes of phenol aq at temperatures from 298 k to 573 k
The Journal of Chemical Thermodynamics, 1997Co-Authors: Vladimir Hynek, Lubomir Hnědkovský, Ivan CibulkaAbstract:A new flow vibrating-tube Densimeter with a photoelectric pick-up system and a new concept of an electromagnetic drive system is described. The apparatus is designed for measurements in the temperature and pressure ranges from 298 K to 573 K and up to 35 MPa, respectively. The density data for dilute aqueous solutions of phenol obtained in the temperature range from 298.15 K to 573.15 K and partial molar volumes of phenol calculated from measured data are presented.
Egon Hassel - One of the best experts on this subject based on the ideXlab platform.
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experimental study of the density and viscosity of 1 ethyl 3 methylimidazolium ethyl sulfate
The Journal of Chemical Thermodynamics, 2012Co-Authors: Hannes Schmidt, Martin Stephan, Javid Safarov, Jurgen Nocke, Ilmutdin M. Abdulagatov, Egon HasselAbstract:Abstract Density and viscosity of 1-ethyl-3-methylimidazolium ethyl sulfate [EMIM][EtSO 4 ] have been measured over the temperature range from (283.15 to 413.15) K and at pressures up to 140 MPa and in the temperature range from (283.15 to 373.15) K at 0.1 MPa, respectively. The expanded uncertainty of the density, pressure, temperature, and viscosity measurements at the 95% confidence level with a coverage factor of k = 2 is estimated to be (0.01 to 0.08)%, 0.1%, 15 mK, and 0.35%, respectively. The measurements were carried out with an Anton–Paar DMA HPM vibration-tube Densimeter and a fully automated SVM 3000 Anton–Paar rotational Stabinger viscometer. The vibration-tube Densimeter was calibrated using various reference fluids, double-distilled water, methanol, toluene, and aqueous NaCl solutions. An empiric equation of state for [EMIM][EtSO 4 ] has been developed using the measured ( p , ρ , T ) data. This equation was used to calculate the various thermodynamic properties of the IL and for compare with measured properties (speed of sound and enthalpy). Theoretically based Arrhenius–Andrade and Vogel–Tamman–Fulcher type equations were use to describe of the temperature dependence of measured viscosities for [EMIM][EtSO 4 ]. All measured properties were detailed compared with the reported data by other author.
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experimental study of the density and viscosity of 1 ethyl 3 methylimidazolium ethyl sulfate
The Journal of Chemical Thermodynamics, 2012Co-Authors: Hannes Schmidt, Martin Stephan, Javid Safarov, Jurgen Nocke, Ilmutdin M. Abdulagatov, Egon HasselAbstract:Abstract Density and viscosity of 1-ethyl-3-methylimidazolium ethyl sulfate [EMIM][EtSO 4 ] have been measured over the temperature range from (283.15 to 413.15) K and at pressures up to 140 MPa and in the temperature range from (283.15 to 373.15) K at 0.1 MPa, respectively. The expanded uncertainty of the density, pressure, temperature, and viscosity measurements at the 95% confidence level with a coverage factor of k = 2 is estimated to be (0.01 to 0.08)%, 0.1%, 15 mK, and 0.35%, respectively. The measurements were carried out with an Anton–Paar DMA HPM vibration-tube Densimeter and a fully automated SVM 3000 Anton–Paar rotational Stabinger viscometer. The vibration-tube Densimeter was calibrated using various reference fluids, double-distilled water, methanol, toluene, and aqueous NaCl solutions. An empiric equation of state for [EMIM][EtSO 4 ] has been developed using the measured ( p , ρ , T ) data. This equation was used to calculate the various thermodynamic properties of the IL and for compare with measured properties (speed of sound and enthalpy). Theoretically based Arrhenius–Andrade and Vogel–Tamman–Fulcher type equations were use to describe of the temperature dependence of measured viscosities for [EMIM][EtSO 4 ]. All measured properties were detailed compared with the reported data by other author.
Javid Safarov - One of the best experts on this subject based on the ideXlab platform.
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experimental study of the density and viscosity of 1 ethyl 3 methylimidazolium ethyl sulfate
The Journal of Chemical Thermodynamics, 2012Co-Authors: Hannes Schmidt, Martin Stephan, Javid Safarov, Jurgen Nocke, Ilmutdin M. Abdulagatov, Egon HasselAbstract:Abstract Density and viscosity of 1-ethyl-3-methylimidazolium ethyl sulfate [EMIM][EtSO 4 ] have been measured over the temperature range from (283.15 to 413.15) K and at pressures up to 140 MPa and in the temperature range from (283.15 to 373.15) K at 0.1 MPa, respectively. The expanded uncertainty of the density, pressure, temperature, and viscosity measurements at the 95% confidence level with a coverage factor of k = 2 is estimated to be (0.01 to 0.08)%, 0.1%, 15 mK, and 0.35%, respectively. The measurements were carried out with an Anton–Paar DMA HPM vibration-tube Densimeter and a fully automated SVM 3000 Anton–Paar rotational Stabinger viscometer. The vibration-tube Densimeter was calibrated using various reference fluids, double-distilled water, methanol, toluene, and aqueous NaCl solutions. An empiric equation of state for [EMIM][EtSO 4 ] has been developed using the measured ( p , ρ , T ) data. This equation was used to calculate the various thermodynamic properties of the IL and for compare with measured properties (speed of sound and enthalpy). Theoretically based Arrhenius–Andrade and Vogel–Tamman–Fulcher type equations were use to describe of the temperature dependence of measured viscosities for [EMIM][EtSO 4 ]. All measured properties were detailed compared with the reported data by other author.
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experimental study of the density and viscosity of 1 ethyl 3 methylimidazolium ethyl sulfate
The Journal of Chemical Thermodynamics, 2012Co-Authors: Hannes Schmidt, Martin Stephan, Javid Safarov, Jurgen Nocke, Ilmutdin M. Abdulagatov, Egon HasselAbstract:Abstract Density and viscosity of 1-ethyl-3-methylimidazolium ethyl sulfate [EMIM][EtSO 4 ] have been measured over the temperature range from (283.15 to 413.15) K and at pressures up to 140 MPa and in the temperature range from (283.15 to 373.15) K at 0.1 MPa, respectively. The expanded uncertainty of the density, pressure, temperature, and viscosity measurements at the 95% confidence level with a coverage factor of k = 2 is estimated to be (0.01 to 0.08)%, 0.1%, 15 mK, and 0.35%, respectively. The measurements were carried out with an Anton–Paar DMA HPM vibration-tube Densimeter and a fully automated SVM 3000 Anton–Paar rotational Stabinger viscometer. The vibration-tube Densimeter was calibrated using various reference fluids, double-distilled water, methanol, toluene, and aqueous NaCl solutions. An empiric equation of state for [EMIM][EtSO 4 ] has been developed using the measured ( p , ρ , T ) data. This equation was used to calculate the various thermodynamic properties of the IL and for compare with measured properties (speed of sound and enthalpy). Theoretically based Arrhenius–Andrade and Vogel–Tamman–Fulcher type equations were use to describe of the temperature dependence of measured viscosities for [EMIM][EtSO 4 ]. All measured properties were detailed compared with the reported data by other author.
Ilmutdin M. Abdulagatov - One of the best experts on this subject based on the ideXlab platform.
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MODERNISED DESIGN OF A HYDROSTATIC Densimeter FOR MEASURING DENSITY OF HIGHLY VISCOUS OILS
'FSB Educational Establishment of Higher Education Daghestan State Technical University', 2020Co-Authors: Dami I Sagdeev, Ilmutdin M. Abdulagatov, N. K. Nikulin, V. I. TyulkinAbstract:Objectives. The aim of this work is to modernise a VT-KHTI Densimeter operated by the method of hydrostatic weighing in order to study the density of highly viscous oils and oil products in the temperature range from 293 K to 473 K at atmospheric pressure.Method. Among the many methods for studying density, the following were used in the course of the study: the constant- and variable-volume piezometer method and the method of hydrostatic weighing.Results. The results of the densimetric study of highly viscous oils obtained from the Republic of Tatarstan in the temperature range from 293 K to 473 K at atmospheric pressure. The following grades are presented: Ashalchinskaya oil (super-viscous, SVO); Kuakbash oil (sulphur), Kichuy oil and Devon oil. Following an analysis and selection of methods for measuring density, a technique for error estimation and Densimeter calibration is presented. A calculated expression for the hydrostatic weighing method, derived from the modernised hydrostatic Densimeter design for measuring the density of highly viscous oils, is presented.Conclusion. The VT-KHTI Densimeter for vacuum working fluids has been modernised and calibrated for research work on measuring the dynamic viscosity coefficient of both Newtonian and non-Newtonian liquids
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density of working liquids for diffusion vacuum pumps
Journal of Chemical & Engineering Data, 2018Co-Authors: Dami I Sagdeev, Marina Fomina, Valeriy Alyaev, Rashid Zagitovich Musi, Ilmutdin M. AbdulagatovAbstract:The density of high viscosity working liquids (BM-1C, LEYBONOL LVO 500, and Alkaren-D24) for diffusion vacuum pumps have been measured over the temperature range from 273 to 473 K at atmospheric pressure. The measurements were made using a newly designed Densimeter based on hydrostatic weighing method. The combined expanded uncertainty of the density, atmospheric pressure, and temperature measurements at 0.95 confidence level with a coverage factor of k = 2 is estimated to be U(ρ) = 1.0 kg·m–3, Ur(P) = 0.01, and U(T) = 0.02 K, respectively. To confirm the reliability, accuracy, and correct operation of the Densimeter, the density of pure n-heptane, ethane-1,2-diol (MEG), and propane-1,2-diol (MPG) with well-established PVT properties (REFPROP/NIST/TDE) over the temperature range from 273 to 473 K at atmospheric pressure were measured using the new developed hydrostatic weighing Densimeter (HWD). Also, in order to additional validate the reliability of the measured density data all diffusion vacuum pump li...
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experimental study of the density and viscosity of 1 ethyl 3 methylimidazolium ethyl sulfate
The Journal of Chemical Thermodynamics, 2012Co-Authors: Hannes Schmidt, Martin Stephan, Javid Safarov, Jurgen Nocke, Ilmutdin M. Abdulagatov, Egon HasselAbstract:Abstract Density and viscosity of 1-ethyl-3-methylimidazolium ethyl sulfate [EMIM][EtSO 4 ] have been measured over the temperature range from (283.15 to 413.15) K and at pressures up to 140 MPa and in the temperature range from (283.15 to 373.15) K at 0.1 MPa, respectively. The expanded uncertainty of the density, pressure, temperature, and viscosity measurements at the 95% confidence level with a coverage factor of k = 2 is estimated to be (0.01 to 0.08)%, 0.1%, 15 mK, and 0.35%, respectively. The measurements were carried out with an Anton–Paar DMA HPM vibration-tube Densimeter and a fully automated SVM 3000 Anton–Paar rotational Stabinger viscometer. The vibration-tube Densimeter was calibrated using various reference fluids, double-distilled water, methanol, toluene, and aqueous NaCl solutions. An empiric equation of state for [EMIM][EtSO 4 ] has been developed using the measured ( p , ρ , T ) data. This equation was used to calculate the various thermodynamic properties of the IL and for compare with measured properties (speed of sound and enthalpy). Theoretically based Arrhenius–Andrade and Vogel–Tamman–Fulcher type equations were use to describe of the temperature dependence of measured viscosities for [EMIM][EtSO 4 ]. All measured properties were detailed compared with the reported data by other author.
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experimental study of the density and viscosity of 1 ethyl 3 methylimidazolium ethyl sulfate
The Journal of Chemical Thermodynamics, 2012Co-Authors: Hannes Schmidt, Martin Stephan, Javid Safarov, Jurgen Nocke, Ilmutdin M. Abdulagatov, Egon HasselAbstract:Abstract Density and viscosity of 1-ethyl-3-methylimidazolium ethyl sulfate [EMIM][EtSO 4 ] have been measured over the temperature range from (283.15 to 413.15) K and at pressures up to 140 MPa and in the temperature range from (283.15 to 373.15) K at 0.1 MPa, respectively. The expanded uncertainty of the density, pressure, temperature, and viscosity measurements at the 95% confidence level with a coverage factor of k = 2 is estimated to be (0.01 to 0.08)%, 0.1%, 15 mK, and 0.35%, respectively. The measurements were carried out with an Anton–Paar DMA HPM vibration-tube Densimeter and a fully automated SVM 3000 Anton–Paar rotational Stabinger viscometer. The vibration-tube Densimeter was calibrated using various reference fluids, double-distilled water, methanol, toluene, and aqueous NaCl solutions. An empiric equation of state for [EMIM][EtSO 4 ] has been developed using the measured ( p , ρ , T ) data. This equation was used to calculate the various thermodynamic properties of the IL and for compare with measured properties (speed of sound and enthalpy). Theoretically based Arrhenius–Andrade and Vogel–Tamman–Fulcher type equations were use to describe of the temperature dependence of measured viscosities for [EMIM][EtSO 4 ]. All measured properties were detailed compared with the reported data by other author.
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Compressed liquid density measurements of dimethyl ether with a vibrating tube Densimeter
The Journal of Chemical Thermodynamics, 2011Co-Authors: Jiangtao Wu, Xianyang Meng, Ilmutdin M. AbdulagatovAbstract:Abstract A measurement system for compressed liquid densities over the temperature range of (293 to 373) K with pressures up to 70 MPa has been developed in this work. The core component of the system is a commercial vibrating tube Densimeter (DMA-HPM) and the system was calibrated by water and vacuum via the method of Lagourette et al. Compressed liquid densities of dimethyl ether have been measured along nine isotherms between (293.84 and 372.94) K up to 70 MPa with the Densimeter system as a function of temperature and pressure. The experimental data obtained in this work were correlated to the Tait equation with an average absolute percentage deviation of 0.014%. Also, the Tait equation was compared with the literature data.
