Results 91 to 100 of about 837 (112)
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A small-volume PVTX system for broadband spectroscopic calibration of downhole optical sensors
Review of Scientific Instruments, 2017An instrument is presented that is capable of measuring the optical spectrum (long-wave ultraviolet through short-wave mid-infrared) of fluids under a range of temperature and pressure conditions from ambient pressure up to 138 MPa (20 000 psi) and 422 K (300 °F) using ∼5 ml of fluid. Temperature, pressure, and density are measured in situ in real-time,
Christopher Michael, Jones +7 more
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Modeling the PVTx Behavior of the N-Methylpyrrolidinone/Water Mixed Solvent
Industrial & Engineering Chemistry Research, 2004An experimental setup for the measurement of densities for the compressed liquid phase of the N-methylpyrrolidinone/water binary solvent from 278.15 to 358.15 K over the full composition range and for pressures up to 60 MPa is reported. Experimental measurements were performed with a recently developed high-pressure vibrating-tube densitometer; the ...
Begoña García +4 more
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PVTx properties in the gas phase for binary R-125/143a system
Fluid Phase Equilibria, 1998Abstract The mixture of pentafluoroethane (R-125) and 1,1,1-trifluoroethane (R-143a) is a promising alternative for the conventional refrigerant R-502. In this paper, we present 220 PVTx property measurements of this binary system along four isopleths in the gas phase which were performed by an established Burnett apparatus.
Heng-Liang Zhang +3 more
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PVTx measurements for N2O+CH3F, N2O+CH2F2, and N2O+CHF3 binary systems
Fluid Phase Equilibria, 2005Abstract Isochoric PVTx measurements have been performed for the binary system of nitrous oxide + CH 3 F (R41), +CH 2 F 2 (R32), and +CHF 3 (R23) using a new experimental set-up. The experiments covered both the two-phase region and the superheated vapor region and were performed within the temperature range 214–358 K and within a pressure range ...
G. Di Nicola +3 more
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Gaseous pVTx measurements for (HFC134a + HC290) by a compact single-sinker densimeter
The Journal of Chemical Thermodynamics, 2015Abstract Comprehensive gaseous pVTx measurements for {1,1,1,2-tetrafluoroethane (HFC134a) + propane (HC290)} were carried out by a compact single-sinker densimeter, based on the Archimedes’ buoyancy principle, at temperatures from (258 to 294) K, pressures up to 0.86 MPa, and mole fractions of HFC134a from (0.2391 to 0.7989).
Haiyang Zhang +5 more
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PVTx Properties of Gaseous Mixtures of Difluoromethane and 1,1,1,2,3,3,3-Heptafluoropropane
Journal of Chemical & Engineering Data, 2007Mixtures of difluoromethane (HFC-32) and 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) are promising alternative refrigerants; however, there is currently no available published experimental PVTx data. The gaseous PVTx properties of HFC-32 (1) + HFC-227ea (2) mixtures were measured using the Burnett-isochoric method with 251 data sets obtained for ...
Xiao-Juan Feng, Yuan-Yuan Duan, Wei Dong
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PVTx Measurements for a H2O + Methanol Mixture in the Subcritical and Supercritical Regions
International Journal of Thermophysics, 2004PVTx relationships for a H2O + CH3OH mixture (0.36 mole fraction of methanol) were measured in a range of temperatures from 373 to 673 K and pressures between 0.042 and 90.9 MPa. The density ranged from 37.76 to 559.03 kg · m−3. Measurements were made with a constant-volume piezometer surrounded by a precision thermostat.
A. R. Bazaev +5 more
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PVTx‐Properties and virial coefficients of the water‐n‐hexane system
Berichte der Bunsengesellschaft für physikalische Chemie, 1994AbstractPVTx‐data for the water‐n‐hexane system are reported in this paper. The data cover a temperature range from 523 to 623 K and pressure range from 2 to 16 MPa at different concentrations. The low pressure compressibility measurements were used to determine second and third virial coefficients for the water‐n‐hexane system.
I. M. Abdulagatov +2 more
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PVTx measurements for H2O+D2O mixtures in the near-critical and supercritical regions
The Journal of Supercritical Fluids, 2003Abstract The PVTx relationships of H 2 O+D 2 O mixtures were measured in the near-critical and supercritical regions. Measurements were made using a constant-volume piezometer immersed in a precision thermostat. The volume of the piezometer V PT was corrected for both temperature and pressure expansions.
Akhmed R Bazaev +4 more
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Measurements of gas phase PVTx properties for the ternary HFC-161/125/32 system
Fluid Phase Equilibria, 2006Abstract As one of the promising alternative refrigerants to replace HCFC-22, the gas phase PVTx properties of the ternary mixture HFC-161/125/32 have been studied. A total of 140 gas phase PVTx properties for the ternary system was obtained at nine different compositions by using the isochoric method.
Qi Chen, Rong-Hua Hong, Guang-Ming Chen
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