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An industrial reference fluid for moderately high viscosity
Oliveira, Carla Padrel de; Caetano, Fernando J. P.; Fareleira, João M. N. A.; Fröba, Andreas P.; Harris, Kenneth R.; Leipertz, AlfredIn industrial practice, there is a demand for a reference standard for viscosity that is established for a readily available fluid to simplify the calibration of industrial viscometers for moderately high viscosities [(50 to 125) mPa · s]. Diisodecyl phthalate (DIDP) has been suggested as that reference fluid, and a number of studies of its properties have been carried out in several laboratories throughout the...
Viscosity measurements of compressed liquid refrigerant blend R-507A, using a v...
Avelino, Helena M. N. T.; Fareleira, João M. N. A.; Oliveira, Carla Padrel deThe refrigerant blend R-507A (50 wt % HFC-143a, 50 wt % HFC-125) is an azeotropic mixture of hydrofluorocarbon refrigerants, 1,1,1-trifluoroethane (HFC-143a) and pentafluoroethane (HFC-125). The paper reports viscosity measurements, performed with a vibrating-wire viscometer, of the refrigerant blend R-507A,at five temperatures in the range (253 to 293) K. The measurements were carried out at pressures from sli...
Validation of a vibrating-wire viscometer: measurements in the range of 0.5 to ...
Oliveira, Carla Padrel de; Caetano, Fernando J. P.; Fareleira, João M. N. A.; Wakeham, William A.The present article describes a novel vibrating-wire viscometer that has been shown to be able to measure viscosities up to 135 mPaâs, after calibration against water at 20 °C, to provide direct traceability to the primary reference for viscosity. For the purpose of validating the instrument, measurements of the viscosity of some selected fluids, including standard reference liquids with viscosity on the order ...
Viscosity measurements of liquid toluene at low temperatures using a dual vibra...
Oliveira, Carla Padrel de; Caetano, Fernando J. P.; Mata, José L. Correia da; Fareleira, João M. N. A.; Wakeham, William A.A recently developed dual vibrating-wire technique has been used to perform viscosity measurements of liquid toluene in the temperature range 213 K ≤ T ≤ 298 K, and at pressures up to approximately 20 MPa. The results were obtained by operating the vibrating-wire sensor in both forced and free decay modes. The estimated precision of the viscosity measurements, in either mode of operation, is ±0.5%, for temperat...
Reacting Mixtures at Low Density - Alkali Metal Vapours
Fialho, Paulo; Ramires, Maria de Lurdes V.; Nieto de Castro, Carlos A.; Fareleira, João M.N.A.This chapter is dedicated to the memory of Professor V. B. Vargaftik (1904-1994) for his outstanding contributions in the field of thermophysical properties of alkali metal vapors. ; "Previous chapters of this volume dealt with the transport properties of nonreacting mixtures. However, there are several systems of scientific and industrial interest that involve chemical reactions between some of the atoms or m...
Thermophysical properties of alkali metal vapours. Part II - assessment of expe...
Fialho, Paulo; Ramires, Maria de Lurdes V.; Nieto de Castro, Carlos A.; Fareleira, João M.N.A.; Mardolcar, Umesh V.Copyright © 1994 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. ; Article first published online: 8 MAY 2010. ; An analysis of the available data on the viscosity and thermal conductivity coefficients of the alkali metal vapours is presented. The analysis is based upon theoretical calculations of the properties of the monatomic systems, described in the preceding parts I and I.A of the present paper, and making ...
Viscosity, Thermal Conductivity and Thermal Diffusion Ratio of the Alkali Metal...
Fialho, Paulo; Ramires, Maria de Lurdes V.; Fareleira, João M.N.A.; Nieto de Castro, Carlos A.Copyright © 1994 by Technomic Publishing Company, Inc. ; Proceedings of the Twenty-Second International Conference on Thermal Condutivity. Tempe, Arizona, November 7-10, 1993. ; The Subcommittee of Transport Properties of IUP AC started in 1982 a project with the objective of correlating and predicting the transport properties of the alkali metal vapours, in the temperature and pressure zones that are useful ...
Thermophysical properties of alkali metal vapours. Part I.A - prediction and co...
Fialho, Paulo; Ramires, Maria de Lurdes V.; Fareleira, João M.N.A.; Nieto de Castro, Carlos A.Copyright © 1993 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. ; Article first published online: 8 MAY 2010. ; New calculations of the collision integrals for the singlet potential functions involved in the determination of viscosity, thermal conductivity and self-diffusion coefficients of the monatomic alkali metal vapours are presented. An interpolation procedure for the calculation of the monatomic systems t...
Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomers
Oliveira, Carla Padrel de; Fareleira, João M. N. A.; Castro, C. A. Nieto deThis paper presents a study of the influence of branching in the binary diffusion coefficients of n-heptane+n-hexane isomers, in the liquid state. The measurements have been made with the Taylor dispersion technique, at several compositions, at 283 and 298 K, for the X+n-heptane mixtures, where X=n-hexane, 3-methylpentane, 2, 3-dimethylbutane, and 2, 2-dimethylbutane. The results show a very interesting behavio...
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