Reference Correlation of the Viscosity of meta-Xylene from 273 to 673 K and up to 200 MPa

Abstract

A new correlation for the viscosity of meta-xylene (m-xylene) is presented. The correlation is based upon a body of experimental data that has been critically assessed for internal consistency and for agreement with theory. It is applicable in the temperature range from 273 K to 673 K at pressures up to 200 MPa. The overall uncertainty of the proposed correlation, estimated as the combined expanded uncertainty with a coverage factor of 2, varies from 1 % for the viscosity at atmospheric pressure to 5 % for the highest temperatures and pressures of interest. Tables of the viscosity, generated by the relevant equations, at selected temperatures and pressures, and along the saturation line, are provided.-1 -CONTENTS

Reference Correlation of the Viscosity of Ethylbenzene from the Triple Point to 673 K and up to 110 MPa

“…The situation for ethylbenzene is similar to that encountered with m-xylene 6 and o-xylene 7- For completeness we present the equations for the two terms and the relevant coefficients. The viscosity in the zero-density limit was represented using a practical engineering form as, The initial-density dependence is given by a simple empirical function,…”

“…8,14 Based on the previous studies, 5-7,15- The primary data set also contains five sets of viscosity measurements 25,26,31,36,69 of liquid ethylbenzene at atmospheric pressure covering the temperature range (178-405) K. The choice of data followed our previous work on xylene isomers [5][6][7] and was based on careful analysis of the available data deploying a number of criteria, as described previously. [5][6][7] Three of the viscometers used to measure the primary ethylbenzene data solely at atmospheric pressure 25,26,31,69 were also used to measure the viscosity of other xylene isomers that were included in the primary data set.…”

“…Hence the data of Akhundov 38 and Abduallaev and Akhundov 43 were classified as secondary for the purposes of developing the current correlation. Instead we have used the behavior of the excess viscosity, where the isotherm stratification should decrease as we enter the supercritical region, 92,94 and the viscosity behavior of other three xylene isomers [5][6][7] to guide the viscosity correlation in the temperature region (453 to 673 K) where no experimental data in the liquid state is available.…”

“…Following the recommendation adopted by the IUPAC Subcommittee of Transport Properties (now known as The International Association for Transport Properties (IATP)), a critical assessment of the experimental data was performed to classify the data as primary and secondary, using well-established criteria 90 that have been widely disseminated. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Based on these criteria, 9…”

“…Thus, it is a continuation of our recent work on viscosity of xylene isomers [5][6][7] ( para-, meta-, orthoxylene) and is carried out under the auspices of the International Union of Pure and Applied Chemistry (IUPAC), as part of the program to develop representations of the viscosity and thermal conductivity of industrially important fluids that has so far produced viscosity correlations for: simple fluids, [8][9][10][11] water 12 , normal alkanes [13][14][15][16][17][18][19][20] and cyclic and aromatic hydrocarbons.…”