Measurement of the Viscosity and Density of Two Reference Fluids, with Nominal Viscosities at <i>T </i>= 298 K and <i>p </i>= 0.1 MPa of (16 and 29) mPa·s, at Temperatures between (298 and 393) K and Pressures below 55 MPa.

Lundstrom, Robbie; Goodwin, Anthony R. H.; Hsu, Kai; Frels, Michael; Caudwell, Derek R.; Trusler, J. P. Martin; Marsh, Kenneth N.

doi:10.1021/je050301u

Cited by 13 publications

(20 citation statements)

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“…Künzel et al 4 report an increase in the uncertainty of the value of viscosity as the difference from the water reference point increases, stating an additional uncertainty of ( 0.6 % on viscosity values, for viscosity up to 100 Pa · s, and an uncertainty of ( 0.2 %, for viscosity smaller than 1 Pa · s, if the measurement conditions are "an optimum". These and other recent estimates 1,5 seem to be based on the work by Daborn,6 concerning the stability of the viscosity scale of the National Physical Laboratory (NPL), from 1952 to 1975. In our view, this restricts those estimates to excellent experimental operating conditions.…”

Section: Introductionmentioning

confidence: 91%

An Industrial Reference Fluid for Moderately High Viscosity

et al. 2008

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In 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 world, within the auspices of a project coordinated by the International Association for Transport Properties. That project has now progressed to the point where it is possible to collate the results of studies of the viscosity of the fluid by a number of different techniques, so as to lead to a proposed standard reference value which will be included in the paper. To support this recommended value, the various measurements conducted have been critically reviewed, and the sample purity and other factors affecting the viscosity have been studied. Density and surface tension measurements have also been performed. This paper does not describe the individual viscosity determinations carried out in independent laboratories because these are the subject of individual publications, but it does describe the ancillary studies conducted and their relevance to the viscosity standard. In addition, the paper contains recommended values for the viscosity of liquid DIDP. The samples of DIDP to which the recommended values refer are isomeric mixtures available commercially from certain suppliers, with a minimum purity by gas chromatography of 99.8 %. The recommended values result from a critical examination of all the measurements conducted to date and are supported by careful arguments dealing with the likely effects of the isomeric content of the sample as well as of other impurities. The proposed reference standard is intended particularly to serve an industrial need for a readily available calibration material with a viscosity close to that required in practical situations. To that end, the recommended value has an overall relative uncertainty of approximately 1 %. It is therefore not intended to supersede for the reference value for the viscosity of water at 20°C, which is known much more accurately, but rather to complement it.

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Section: Introductionmentioning

confidence: 91%

An Industrial Reference Fluid for Moderately High Viscosity

et al. 2008

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“…According to the instructions, these apparatus were calibrated by measuring the density of Millipore quality water and ambient air for the densimeter, as well as by measuring the refractive index of Millipore quality water and tetrachloroethylene (supplied by the company) for the refractometer. The frequency of the Anton Paar densimeter is affected by the viscosity of the sample [27]. Due to this influence, a correction was applied to the density of those samples displaying high viscosities.…”

Section: Apparatus and Experimental Lle Proceduresmentioning

confidence: 99%

A study on the liquid–liquid equilibria of 1-alkyl-3-methylimidazolium hexafluorophosphate with ethanol and alkanes

Pereiro

Rodríguez

2008

Fluid Phase Equilibria

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“…The density, the speed of sound and the refractive index of Ammoeng 102 were measured as a function of temperature from T = (283.15 to 343.15) K. A correction was applied to the density for our samples at high viscosities because the frequency of the Anton Paar densimeter is affected by the viscosity of the sample [21].…”

Section: Resultsmentioning

confidence: 99%