Temperature and Density Dependence of the Viscosity of Octane and Toluene

Harris, Kenneth R.; and, Rakesh Malhotra; Woolf, L. A.

doi:10.1021/je970105q

Cited by 72 publications

(50 citation statements)

References 28 publications

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“…For cyclopentane, this correlation is superior to those based on reduced viscosities employed in earlier studies. 8,[20][21][22] The viscosity of cyclopentane has been measured under high pressure by Brazier and Freeman 12 using a rolling ball viscometer at the single temperature of 303.15 K to 400 MPa pressure and by Assael and Dalaouti 2 using a vibrating wire technique over the temperature range of (210 to 310) K but to only 25 MPa pressure. Figure 3 shows a comparison with the results of this work.…”

Section: Resultsmentioning

confidence: 99%

Temperature and Density Dependence of the Viscosity of Cyclopentane

2003

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New measurements have been made for the viscosity of cyclopentane between 258 K and 298 K at pressures up to approximately 380 MPa with a self-centering falling-body viscometer. These extend earlier high-pressure measurements made below 25 MPa by Assael and Dalaouti. A correlation function is used to represent the results as a function of temperature and molar volume with a standard deviation of (0.3%. The uncertainty in the measurements is estimated at (1%.

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Section: Resultsmentioning

confidence: 99%

Temperature and Density Dependence of the Viscosity of Cyclopentane

2003

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“…Deviations in the viscosity of toluene at 298.15 K from the correlation of Assael et al [13]: (♦) This work (May 2002); ( ) this work (August 2002); ( ) this work (February 2003); ( ) Dymond et al[16]; (X) Harris et al[14]; ( * ) Harris[17]; (+) Kashiwagi and Makita[18].…”

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confidence: 90%

The Viscosity and Density of n-Dodecane and n-Octadecane at Pressures up to 200�MPa and Temperatures up to 473 K

Caudwell

Trusler

Vesovic

et al. 2004

International Journal of Thermophysics

198

147

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A vibrating-wire instrument for simultaneous measurement of the density and viscosity of liquids under conditions of high pressure is described. The instrument is capable of operation at temperatures between 298.15 and 473.15 K at pressures up to 200 MPa. Calibration was performed by means of measurements in vacuum, air, and toluene at 298.15 K. For n-dodecane measurements were made along eight isotherms between 298.15 and 473.15 K at pressures up to 200 MPa, while for n-octadecane measurements were measured along seven isotherms between 323.15 and 473.15 K at pressures up to 90 MPa. The estimated uncertainty of the results is 2% in viscosity and 0.2% in density. Comparisons with literature data are presented.

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“…The first vibrating-wire viscometer was developed in1964 by Tough et al [25]. Cylindrical wire was chosen as the most suitable geometry for high pressure operations [12,24]. The method involves setting a thin tungsten wire into traversal vibration and determining the damping of this motion by the surrounding sample liquid.…”

Section: Vibrating-wire Viscometersmentioning

confidence: 99%

High-Pressure Viscosity and Density of Polymer Solutions at the Critical Polymer Concentration in Near-Critical and Supercritical Fluids

Dindar

Kiran

2002

Ind. Eng. Chem. Res.

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The motivation for the determination of the viscosity of polymer solutions in dense fluids at the critical polymer concentration stems from the need to understand the factors that influence the time scale of phase separation in systems that undergo spinodal decomposition upon a pressure quench. In a recent investigation of PDMS + CO 2 and PE + n -pentane where molecular weights of the polymers and the critical polymer concentrations were comparable, significant differences were observed in the time evolution of new phase growth. Among the reasons that contribute to the difference in phase separation kinetics is the viscosity of the solutions. This thesis has been carried out to experimentally demonstrate the differences in viscosities of solutions at their critical polymer concentration. Specifically, the thesis focused on the high-pressure density and viscosity of solutions of poly(dimethylsiloxane) (M w = 93,700, M w /M n = 2.99) in supercritical carbon dioxide and of polyethylene (M w = 121,000, M w /M n = 4.3) in near-critical n -pentane. The measurements have been carried out a t the critical polymer concentrations, which is 5.5 wt % for solution of PDMS in CO 2 and 5.75 wt % for solution of PE in n -pentane. For PDMS + CO 2 system, the measurements were conducted at 55, 70, 85 and 100 o C and pressures up to 50 MPa. For iii PE + n-pentane system, the measurements were conducted at 140 and 150 o C and again up to 50 MPa. All measurements were conducted in the one-phase homogenous regions.At these temperatures and pressures, the viscosities were observed to be in the range from 0.14 mPa.s to 0.22 mPa.s for PDMS + CO 2 , and from 2.3 mPa.s to 4.6 mPa.s for PE + npentane systems. In both systems the viscosities increase with pressure and decrease with temperature. The temperature and pressure dependence could be described by Arrhenius type relationships in terms of flow activation energy (E # ) and flow activation volume (V # ) parameters. The flow activation energies in PDMS + CO 2 system were about 7 kJ/mol compared to about 18 kJ/mol for the PE + n -pentane system. The activation volumes were in the range 40-64 cm 3 /mol for PDMS + CO 2 system and 65-75 cm 3 /mol for the PE + n -pentane solution. The higher values of E # and V # represent the higher sensitivity of viscosity to temperature and pressure changes in the PE + n -pentane system. The viscosity d ata could also be correlated in terms of density using free-volume based Doolittle type equations. Density is shown to be an effective scaling parameter to describe T/P dependency of viscosity. The closed packed volumes suggested from density correlations were found to be around 0.33 cm 3 /g for the PDMS and 0.48 cm 3 /g for the PE systems. Comparison of the viscosity data in these systems with the data on the kinetics of pressure-induced phase separation confirms that the slower kinetics in the PE + n-pentane stems from the higher viscosity in this solution compared to the PDMS + CO 2 system, despite the similarity in the molecular weight of the polymer a...

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Temperature and Density Dependence of the Viscosity of Octane and Toluene

Cited by 72 publications

References 28 publications

Temperature and Density Dependence of the Viscosity of Cyclopentane

Temperature and Density Dependence of the Viscosity of Cyclopentane

The Viscosity and Density of n-Dodecane and n-Octadecane at Pressures up to 200�MPa and Temperatures up to 473 K

High-Pressure Viscosity and Density of Polymer Solutions at the Critical Polymer Concentration in Near-Critical and Supercritical Fluids

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