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Wilhelm, J. O.; Vogel, E.; Lehmann, Jochen K.; Wakeham, W. A.

doi:10.1023/a:1022505209226

Cited by 37 publications

(29 citation statements)

References 3 publications

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“…It should be noted that, when measuring the resonance frequency in vacuum or air, the wire can easily be driven to nonlinear behavior. Small nonlinear [12] behavior has also been noticed in toluene at 348 K with the apparent viscosity increasing linearly with drive voltage squared; similar behavior has been observed by Wilhelm et al [9]. The use of a current of 0.9 mA produced a 1% increase in observed viscosity from that at currents below 0.1 mA.…”

Section: Calibration and Testingsupporting

confidence: 81%

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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

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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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Section: Calibration and Testingsupporting

confidence: 81%

“…Many practical devices, operating in either steady-state or transient modes, have since been developed [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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

Self Cite

198

147

View full text Add to dashboard Cite

show abstract

“…In the context of vibrating wire viscometers, magnetic damping effects were first observed by Wilhelm et al [8] and again mentioned by Padua et al [5] in 1998. Wilhelm et al [8] showed that the drag force F Mdamp due to magnetic damping is given by…”

Section: Introductionmentioning

confidence: 88%

“…Magnetic damping of oscillatory motion has also been observed in circumstances where eddy currents are induced in a moving conductor [7]. In the context of vibrating wire viscometers, magnetic damping effects were first observed by Wilhelm et al [8] and again mentioned by Padua et al [5] in 1998. Wilhelm et al [8] showed that the drag force F Mdamp due to magnetic damping is given by…”

Section: Introductionmentioning

confidence: 95%

Magnetic Damping Effects in Forced-Oscillation Vibrating-Wire Viscometers

2012

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Vibrating wire viscometers rely on the principle that the viscosity of the fluid surrounding the wire provides the dominant damping action on the motion of the wire. However, some residual damping is always present due to other effects such as internal friction of the wire (anelastic relaxation), losses through the wire supports, and magnetic damping. Magnetic damping is a physical mechanism that has received relatively less attention than internal friction in the context of viscometers. The phenomenon arises because the current induced by the motion of the wire contributes to the magnetic field in such a way as to oppose its own motion. For a test circuit using a 40 µm diameter tungsten wire in a 0.3 T magnetic field, surprisingly, the effect of magnetic damping was found to be of a similar order of magnitude to other non-viscous damping effects. The effect can be accounted for by including the internal impedance of the oscillating voltage source in the model and it disappears completely for a perfect oscillating current source.

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“…Viscosity measurements are important for production flow control, guarantee of the production safety, control and evaluation of product quality, medical diagnosis, and scientific research. According to the different measuring principles, traditional viscometry can be grouped as follows: capillary viscometry [3][4][5][6][7][8], rotating viscometry [9][10][11], falling ball or needle viscometry [12][13][14][15], vibration viscometry [16][17][18][19], etc.…”

Section: Introductionmentioning

confidence: 99%

A New Method for Liquid Viscosity Measurements: Inclined-Tube Viscometry

Zhang

Xue

et al. 2008

Int J Thermophys

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In this article, a method which can be used to measure the viscosity of liquids with an inclined tube at high pressures and for low-boiling substances is described. The measurement equation was established. The measuring methods for two unknown parameters which are in the measurement equation are presented, and a viscosity measurement system was designed and constructed, which consists of an experimental cell, an inclination-angle control subsystem, a constant temperature subsystem, and a data collection and process subsystem. At atmospheric pressure, the kinematic viscosity of pure water was measured at temperatures from 273.15 K to 333.15 K to demonstrate the performance of the apparatus. The results show that the absolute average relative deviation is 0.84% in comparison with reliable literature values. The kinematic viscosity of saturated liquid R134a and R600a were also measured at temperatures from 273.15 K to 295.15 K and 273.15 K to 300.15 K, respectively, and the corresponding absolute average relative deviations are 1.04% and 1.02% in comparison with reliable literature values. These experimental results demonstrate the performance of the apparatus, while providing estimates of the uncertainty and reliability of the experimental system.

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Cited by 37 publications

References 3 publications

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

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

Magnetic Damping Effects in Forced-Oscillation Vibrating-Wire Viscometers

A New Method for Liquid Viscosity Measurements: Inclined-Tube Viscometry

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