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Browsing by Author "Tufeu, R."

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  • Density of 1,1-dichloro-1-fluoroethane (HCFC 141b) as a function of temperature and pressure.
    Publication . Sousa, Ana T.; Fialho, Paulo; Nieto de Castro, Carlos A.; Tufeu, R.; Neindre, B. Le
    The density of HCFC 141b has been measured at several temperatures between 260 and 320 K, Mid pressures up to 20 MPa, with a mechanical oscillator densimeter. The densimeter was calibrated with 2,2,4-trimethylpentane, whose density was obtained from a correlating cyuation with 0.3% uncertainty. The density data obtained for HCFC 14H) hits a reproducibility of 0.05% and an uncertainty of 0.3%. The data obtained were fitted to a Tait-type equation which reproduced the experimental densities within 0.11 % and were compared with the data obtained in other works.
    1996-05Journal article Open access Show more
  • Density of HCFC 142b and of its mixture with HCFC 22
    Publication . Sousa, Ana T.; Fialho, Paulo; Nieto de Castro, Carlos A.; Tufeu, R.; Le Neindre, B.
    The density of the binary mixture 40/60 wt% of monochlorodifluoromethane (HCFC 22) and 1-chloro-1,1-difluoroethane (HCFC 142b) in the liquid phase, has been measured between 300 and 370 K and pressures up to 19 MPa, with an oscillating fork sendimeter, operating in a relative mode. Toluene and vacuum have been used as calibrating fluids. The accuracy of the data is 0.08 %. An equation for the dependence of density in temperature and pressure for HCFC 142b and for this mixture is also presented.
    1992-11-30Journal article Restricted access Show more
  • The thermal conductivity of 1-chloro-1,1-difluoroethane (HCFC-142b)
    Publication . Sousa, Ana T.; Fialho, Paulo; Nieto de Castro, Carlos A.; Tufeu, R.; Le Neindre, B.
    The thermal conductivity of 1-chloro-l,l-difluoroethane (HCFC-142b) has been measured in the temperature range 290 to 504 K and pressures up to 20 MPa with a concentric-cylinder apparatus operating in a steady-state mode. These temperature and pressure ranges cover all fluid states. The estimated accuracy of the method is about 2 %. The density dependence of the thermal conductivity has been studied in the liquid region.
    1992Journal article Restricted access Show more