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  • high pressure  (12)
  • thermal conductivity  (9)
  • compressibility  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Solid-liquid phase equilibria of (α-methylnaphthalene + β-methylnaphthalene) and (chlorobenzene + bromobenzene) systems under high Pressures (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 671-680 
    Details
    ISSN: 1572-9567
    Keywords: bromobenzene ; chlorobenzene ; high pressure ; α-methylnaphthalene ; β-methylnaphthalene ; solid-liquid phase equilibrium ; solid solution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid-liquid phase equilibria of the (α-methylnaphthalene + β-methylnaphthalene) and the (chlorobenzene + bromobenzene) systems have been investigated at temperatures from 278 to 343 K and pressures up to 500 MPa using a high-pressure optical vessel. The uncertainties of the measurements of temperature, pressure, and composition were within ±0.1 K, ±0.5 MPa, and ±0.001 mole fraction, respectively. In both systems, the freezing and melting pressures at a constant composition increase almost linearly with increasing temperatures. In the former system, where the two components can form a solid solution with one another to a limit extent, the eutectic point shifts to a higher temperature and to a α-methylnaphthalene-rich composition with increasing pressures. In the latter system, where the two components are completely soluble in each other in the solid phase, the freezing points of all mixtures lie between those of the pure components at each pressure. It is found that the coexistence curves obtained can be expressed by a quadratic equation in pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500787
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of pressure on the solid-liquid phase equilibria of binary organic systems (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 27-34 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; mixtures ; organic liquid ; phase equilibrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid-liquid phase equilibria of the binary mixtures of the organic liquids have been investigated at temperatures from 278 to 343 K and pressures up to 500 MPa using a high-pressure optical vessel. The systems investigated are as follows: (1) simple eutectic systems-benzene + cyclohexane system and benzene + 2-methyl-2-propanol system; (2) eutectic systems with formation of intermolecular compounds — carbon tetrachloride + p-xylene system and carbon tetrachloride + benzene system; (3) partial solid solution system-α-methylnaphthalene + β-methylnaphthalene system; and (4) complete solid solution system-chlorobenzene + bromobenzene system. The uncertainties of the measurements of temperature, pressure and composition are within ±0.1 K, ± 0.5 MPa, and ±0.001 mole fraction, respectively. The freezing and melting temperatures at a constant composition increase monotonously with pressure. The eutectic mixture becomes richer in the component whose temperature coefficient of the freezing pressure is larger and the eutectic temperature rises monotonously with increasing pressure in the eutectic systems. The pressure-temperature-composition relation of the solid-liquid phase equilibria can be expressed satisfactorily by an equation newly proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500705
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  • 3
    Electronic Resource
    Electronic Resource
    Density and viscosity of linear perfluoropolyethers under high pressures (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 857-870 
    Details
    ISSN: 1572-9567
    Keywords: compressibility ; density ; fluorocarbon oil ; free-volume equation ; high pressure ; perfluoropolyether ; specific volume ; Tait equation ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New experimental data on the density and viscosity of linear, unbranched perfluoropolyethers are presented at temperatures from 273 to 333 K and pressures up to 180 MPa. The measurements were carried out by a high-pressure burrette apparatus and a falling-cylinder viscometer. The uncertainties of the measurements are estimated to be less than 0.09% for the specific volume and 2.5% for the viscosity. The P-V data at each temperature are correlated satisfactorily by the Tait equation. The viscosity data are also analyzed and correlated with pressure or molar volume by several empirical and theoretical equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00514481
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal conductivity of gaseous HFC-134a, HFC-143a, HCFC-141b, and HCFC-142b (1991)
    Springer
    International journal of thermophysics 12 (1991), S. 949-963 
    Details
    ISSN: 1572-9567
    Keywords: coaxial-cylinder method ; fluorocarbons ; halogenated ethane ; R134a ; R143a ; R141b ; R142b ; refrigerants ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivity of new environmentally acceptable fluorocarbons HFC-134a (CH2FCF3), HFC-143a (CH3CF3), HCFC-141b (CH3CCl2F), and HCFC-142b (CH3CCl2F) in the gaseous phase has been measured in the temperature range 293–353 K at pressures up to 4 MPa. The thermal conductivity has been measured with a coaxial-cylinder cell on a relative basis. The apparatus was calibrated with He, Ne, Ar, Kr, N2, CH4, and SF6 as reference fluids. The uncertainty of the experimental data obtained is estimated to be within 2% except for the uncertainty associated with the reference thermal-conductivity values. The excess thermal conductivity has been correlated satisfactorily as a function of density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503512
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal conductivity of fourteen liquids in the temperature range 298–373 K (1982)
    Springer
    International journal of thermophysics 3 (1982), S. 101-116 
    Details
    ISSN: 1572-9567
    Keywords: aromatic hydrocarbons ; cyclohexane ; n-alkanes ; phenyl halides ; thermal conductivity ; toluene ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New experimental data on the thermal conductivity of 14 organic liquids at atmospheric pressure are presented in the temperature range from 25 to 100°C. The liquids measured are five n-alkanes (C6, C7, C8, C10, C12), cyclohexane, six aromatic hydrocarbons (benzene, ethylbenzene, o-, m-, p-xylenes, isopropylbenzene) and two phenyl halides (chloro-, bromobenzenes). The measurements were performed by a transient hot-wire method on a relative basis. The thermal conductivity of toluene, which was selected as a reference liquid, was determined on an absolute basis with another transient apparatus. The precision of the present experimental results is within ±1.2%. The uncertainty of the thermal conductivity values is estimated to be within ±2%; this includes the uncertainty of the values of toluene as the reference liquid. The experimental results for each liquid are represented satisfactorily by a linear equation in temperature. At a reduced temperature T/T c=0.5, thermal conductivity has a simple relation with the molar density for each homologous series of liquids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503634
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  • 6
    Electronic Resource
    Electronic Resource
    Solid-liquid phase equilibria of benzene + cyclohexane system under high pressures (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 415-424 
    Details
    ISSN: 1572-9567
    Keywords: benzene ; cyclohexane ; eutectic point ; high pressure ; solid-liquid phase equilibrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid-liquid phase equilibria of the benzene + cyclohexane system have been investigated experimentally at temperatures from 278 to 323 K and pressures up to 500 MPa using a newly designed optical vessel. The uncertainties of the measurements of temperature, pressure, and composition are within ±0.1 K, ±0.5 MPa, and ±0.001 mole fraction, respectively. The solid-liquid equilibrium pressure at a constant composition increases almost linearly with increasin temperature. The eutectic point shifts to a higher temperature and to a benzenerich composition with increasing pressure. This trend is found to agree with the direction predicted by the van Laar equation. The solid-liquid coexistence curves can be expressed by the Wilson equation with a mean deviation of 0.007 and a maximum deviation of 0.029 in mole fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567102
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  • 7
    Electronic Resource
    Electronic Resource
    Solid-liquid phase equilibria of benzene + 2-methyl-2-propanol system under high pressures (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 61-71 
    Details
    ISSN: 1572-9567
    Keywords: benzene ; high pressure ; 2-methyl-2-propanol ; solid-liquid phase equilibrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid-liquid phase equilibria of the benzene + 2-methyl-2-propanol system have been investigated at temperatures from 278 to 323 K and pressures up to 300 MPa using a high-pressure optical vessel. The uncertainties of the measurements of temperature, pressure and composition are within ±0.1 K, ±0.5 MPa, and ±0.001 mole fraction, respectively. The freezing pressure at a constant composition increases monotonously with pressure. The eutectic point shifts to a higher temperature and benzene-rich composition with increasing pressure. In order to describe the pressure-temperature-composition relation of high-pressure solid-liquid phase equilibria, a new simple equation has been proposed as follows: $$In x_i (P,T) = - \frac{1}{{RT}}\{ C(T)[P - B(T)] + D(T)[P^2 - B(T)^2 ]\} $$ where B, C, and D are the temperature-dependent coefficients and are expressed by the polynomials of reciprocal of temperature. It is found that the solid-liquid coexistence curves of both eutectic systems and solid-solution systems can be correlated satisfactorily by this equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00504000
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal conductivity of liquid halogenated ethanes under high pressures (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 465-479 
    Details
    ISSN: 1572-9567
    Keywords: fluorocarbon ; halogenated ethane ; liquid ; high pressure ; refrigerant ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New experimental data on the thermal conductivity of liquid halogenated ethanes, R112 (CCl2F-CCl2F), R113 (CCl2F-CClF2), R114 (CClF2-CClF2), R114B2 (CBrF2-CBrF2), and R123 (CHCl2-CF3), are presented in the temperature range from 283 to 348 K at pressures up to 200 MPa or the freezing pressures. The measurements were carried out by a transient hot-wire apparatus within an uncertainty of ±1.0%. The thermal conductivity data obtained have been analyzed by means of the corresponding-states principle and other empirical methods. It is found that the corresponding-states correlation λ=f(Tr, Pr) holds well for R112, R113, and R114. The thermal conductivity can also be correlated satisfactorily with temperature, pressure, and molar volume by a similar expression to the Tait equation and the dense hard-sphere model presented by Dymond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503147
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  • 9
    Electronic Resource
    Electronic Resource
    Viscosity of aqueous solutions of 1,2-ethanediol and 1,2-propanediol under high pressures (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 511-523 
    Details
    ISSN: 1572-9567
    Keywords: aqueous alcohol solution ; ethanediol ; ethylene glycol ; falling-cylinder viscometer ; free-volume theory ; high pressure ; pressure effect ; propanediol ; propylene glycol ; viscosity ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New experimental data on the viscosity of aqueous solutions of 1,2-ethanediol (ethylene glycol) and 1,2-propanediol (propylene glycol) are presented at 298 and 323 K under pressures up to 120 MPa. The measurements were performed by a falling-cylinder viscometer on a relative basis with an uncertainty of less than ±2%. The viscosity of these aqueous solutions at a constant temperature and pressure increases monotonously with increasing concentrations of diols (glycols) and is slightly lower than the mole fraction average value at each composition. The viscosity also increases almost linearly with pressure at a constant temperature and composition. The pressure coefficient of the viscosity, (∂η/∂P)T,x, increases with decreasing temperature and increasing concentrations of diols. The experimental results are correlated with pressure, density, and composition by several empirical equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503150
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  • 10
    Electronic Resource
    Electronic Resource
    Thermal conductivity of gaseous fluorocarbon refrigerants R 12, R 13, R 22, and R 23, under pressure (1981)
    Springer
    International journal of thermophysics 2 (1981), S. 249-268 
    Details
    ISSN: 1572-9567
    Keywords: chorotrifluoromethane (R 13) ; chlorodifluoromethane (R 22) ; dichlorodifluoromethane (R 12) ; fluorocarbon ; pressure effect on thermal conductivity ; thermal conductivity ; trifluoromethane (R 23)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivity of four gaseous fluorocarbon refrigerants has been measured by a vertical coaxial cylinder apparatus on a relative basis. The fluorocarbon refrigerants used and the ranges of temperature and pressure covered are as follows: R 12 (Dichlorodifluoromethane CCl2F2): 298.15–393.15 K, 0.1–4.28 MPa R 13 (Chlorotrifluoromethane CClF3): 283.15–373.15 K, 0.1–6.96 MPa R 22 (Chlorodifluoromethane CHClF2): 298.15–393.15 K, 0.1–5.76 MPa R 23 (Trifluoromethane CHF3): 283.15–373.15 K, 0.1–6.96 MPa The apparatus was calibrated using Ar, N2, and CO2 as the standard gases. The uncertainty of the experimental data is estimated to be within 2%, except in the critical region. The behavior of the thermal conductivity for these fluorocarbons is quite similar; thermal conductivity increases with increasing pressure. The temperature coefficient of thermal conductivity at constant pressure, (∂λ/∂T) p , is positive at low pressures and becomes negative at high pressures. Therefore, the thermal conductivity isotherms of each refrigerant intersect each other in a specific range of pressure. A steep enhancement of thermal conductivity is observed near the critical point. The experimental results are statistically analyzed and the thermal conductivities are expressed as functions of temperature and pressure and of temperature and density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00504188
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