Tris(2-Ethylhexyl) trimellitate (TOTM) a potential reference fluid for high viscosity. Part II: Density measurements at temperatures from (293 to 373)K and pressures up to 68MPa

Diogo, João C. F.; Avelino, Helena Maria da Nóbrega Teixeira; Caetano, Fernando J. P.; Fareleira, João M. N. A.

doi:10.1016/j.fluid.2014.10.003

Cited by 22 publications

(40 citation statements)

References 25 publications

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“…Those density measurements are presented in part II of this work [42]. The estimated overall maximum measurement uncertainty is AE0.2% [24,53].…”

Section: Vibrating U-tube Density Measurementsmentioning

confidence: 99%

“…The density data, shown in Table 3, needed to compute the vibrating wire viscosity data were obtained using Eq. (6) with parameters of Table 4 from part II [42] of the present work. These density data used were corrected for the effect of viscosity on the U-tube density measurements.…”

Section: Viscosity Measurements Of Totm Using the Vibrating Wire Techmentioning

confidence: 99%

“…These density data used were corrected for the effect of viscosity on the U-tube density measurements. The correction procedure is described in part II of this work [42]. As the density and viscosity are mutually influenced by that correction, the data shown in Table 3 for both properties have been corrected using an iterative procedure.…”

Section: Viscosity Measurements Of Totm Using the Vibrating Wire Techmentioning

confidence: 99%

“…In fact, a correction in the density of about 0.1% leads to a variation smaller than 0.05% in the viscosity obtained with the present vibrating wire technique. The density data with and without correction for the viscosity effect on the Utube density measurements are presented in Table 3 of part II [42].…”

Section: Viscosity Measurements Of Totm Using the Vibrating Wire Techmentioning

confidence: 99%

“…The density data required to compute the viscosity from the output of the vibrating-wire viscometer, were measured from (293 to 373) K up to 68 MPa, using an Anton Paar vibrating Utube densimeter, model DMA HP, which are described in part II [42] of the present work.…”

Section: Introductionmentioning

confidence: 99%

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Tris(2-ethylhexyl) trimellitate (TOTM) a potential reference fluid for high viscosity. Part I: Viscosity measurements at temperatures from (303 to 373) K and pressures up to 65 MPa, using a novel vibrating-wire instrument

Diogo

Avelino

Caetano

et al. 2014

Fluid Phase Equilibria

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A B S T R A C TThe article reports viscosity measurements of compressed liquid tris(2-ethylhexyl) trimellitate or 1,2,4-Benzenetricarboxylic acid, tris(2-ethylhexyl) ester (TOTM) which is an important plasticizer in the polymer industry and has wide applications as a lubricant. Nevertheless, the main motivation for the present work is to propose TOTM as a plausible candidate for an industrial viscosity reference fluid for high viscosity, high pressure and high temperature. This kind of reference fluid is presently on demand by oil industries and the International Association for Transport Properties is developing efforts aiming to select appropriate candidates and to establish the corresponding reference data.The viscosity measurements were performed with a novel vibrating wire sensor. The new instrument was designed for operation at high pressures (up to 100 MPa) and temperatures up to 373 K. The present measurements were obtained using the vibrating wire sensor in the forced oscillation or steady-state mode of operation. The viscosity measurements were carried out up to 65 MPa and at six temperatures from (303 to 373) K.The viscosity results were correlated with density, using a modified hard-spheres scheme. The root mean square deviation of the data from the correlation is 0.53% and the maximum absolute relative deviation was less than 1.7%. The expanded uncertainty of the present viscosity results, at a 95% confidence level, is estimated to be less than AE2% for viscosities up to 68 mPa s, less than AE2.6% for viscosities between (69 and 268) mPa s and less than AE3% for higher viscosities.The TOTM density data necessary to compute the viscosity results were measured using a vibrating Utube densimeter, model DMA HP and are described in part II of the present work.No literature data above atmospheric pressure could be found for the viscosity of TOTM. As a consequence, the present viscosity results could only be compared upon extrapolation of the vibrating wire data to 0.1 MPa. Independent viscosity measurements were performed, at atmospheric pressure, using an Ubbelohde capillary in order to compare with the vibrating wire results, extrapolated by means of the above mentioned correlation. The two data sets agree within AE1%, which is commensurate with the mutual uncertainty of the experimental methods. Comparisons of the literature data obtained at atmospheric pressure with the present extrapolated vibrating-wire viscosity measurements have shown an agreement within AE2% for temperatures up to 339 K and within AE3.3% for temperatures up to 368 K.

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“…Those density measurements are presented in part II of this work [42]. The estimated overall maximum measurement uncertainty is AE0.2% [24,53].…”

Section: Vibrating U-tube Density Measurementsmentioning

confidence: 99%

Section: Viscosity Measurements Of Totm Using the Vibrating Wire Techmentioning

confidence: 99%

Section: Viscosity Measurements Of Totm Using the Vibrating Wire Techmentioning

confidence: 99%

Section: Viscosity Measurements Of Totm Using the Vibrating Wire Techmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tris(2-ethylhexyl) trimellitate (TOTM) a potential reference fluid for high viscosity. Part I: Viscosity measurements at temperatures from (303 to 373) K and pressures up to 65 MPa, using a novel vibrating-wire instrument

Diogo

Avelino

Caetano

et al. 2014

Fluid Phase Equilibria

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Quantitative Viscosity Mapping Using Fluorescence Lifetime Measurements

2016

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Lubricant viscosity is a key driver in both the tribological performance and energy efficiency of a lubricated contact. Elastohydrodynamic (EHD) lubrication produces very high pressures and shear rates, conditions hard to replicate using conventional rheometry. In situ rheological measurements within a typical contact are therefore important to investigate how a fluid behaves under such conditions. Molecular rotors provide such an opportunity to extract the local viscosity of a fluid under EHD lubrication. The validity of such an application is shown by comparing local viscosity measurements obtained using molecular rotors and fluorescence lifetime measurements, in a model EHD lubricant, with reference measurements using conventional rheometry techniques. The appropriateness of standard methods used in tribology for high-pressure rheometry (combining friction and film thickness measurements) has been verified when the flow of EHD lubricant is homogeneous and linear. A simple procedure for calibrating the fluorescence lifetime of molecular rotors at elevated pressure for viscosity measurements is proposed.

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Transcriptome profiling and pathway analysis of hepatotoxicity induced by tris (2-ethylhexyl) trimellitate (TOTM) in mice

Chen

et al. 2016

Environmental Toxicology and Pharmacology

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Tris(2-Ethylhexyl) trimellitate (TOTM) a potential reference fluid for high viscosity. Part II: Density measurements at temperatures from (293 to 373)K and pressures up to 68MPa

Cited by 22 publications

References 25 publications

Tris(2-ethylhexyl) trimellitate (TOTM) a potential reference fluid for high viscosity. Part I: Viscosity measurements at temperatures from (303 to 373) K and pressures up to 65 MPa, using a novel vibrating-wire instrument

Tris(2-ethylhexyl) trimellitate (TOTM) a potential reference fluid for high viscosity. Part I: Viscosity measurements at temperatures from (303 to 373) K and pressures up to 65 MPa, using a novel vibrating-wire instrument

Quantitative Viscosity Mapping Using Fluorescence Lifetime Measurements

Transcriptome profiling and pathway analysis of hepatotoxicity induced by tris (2-ethylhexyl) trimellitate (TOTM) in mice

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