Vibrating Wire Viscometer

Tough, J. T.; McCormick, W. D.; Dash, J. G.

doi:10.1063/1.1718741

Cited by 94 publications

(26 citation statements)

References 2 publications

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“…A practical device based on the Navier-Stokes equations was developed in 1963 by Tough et al [3] and the theory was re-visited in 1986 by Retsina et al [4,5] who included the effect of the wire stiffness and obtained a solution appropriate to transient motion. 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

192

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: 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

192

147

View full text Add to dashboard Cite

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“…For a particular fluid, or range of fluids, conditions expressed by Eqs. (4) and (5) evidently dictate the frequency of operation, the radius of the wire to be employed, and the amplitude of motion to be used.…”

Section: Vm>>mentioning

confidence: 99%

“…Such a solution has been obtained for an infinite volume of fluid in which the effects of compressibility and the nonlinear inertial terms are negligible. The first condition implies that the circumstances should be such that the Mach number Ma = (1 + 32)1/2co~R/c ~ 1 (4) and the second that e ~ pcoR2/# -= s ~ 1/e 2 (5) Here e = ~rnax/R is the maximum amplitude of the motion, expressed in terms of the beam radius, and c is the sonic velocity in the fluid. For a particular fluid, or range of fluids, conditions expressed by Eqs.…”

Section: Vm>>mentioning

confidence: 99%

Vibrating-wire viscometers for liquids at high pressures

et al. 1992

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The design and operation of two independent vibrating-wire viscometers are described. The instruments are intended for operation in the liquid phase at pressures up to 300 MPa and have been designed specifically for this purpose using the detailed theory of the device. Extensive evidence is adduced to demonstrate that the operation of the viscometers is consistent with the theory. Although the instruments attain a precision in viscosity measurements of • when used in an absolute mode the accuracy that can be achieved is no better than __+3%. However, if the instrument is calibrated for two welldefined instrumental parameters, the uncertainty in the reported viscosity is improved to _+0.5%. The results of measurements of the viscosity of normal heptane in the temperature range 303 to 348 K at pressures up to 250 MPa made with one of the viscometers are reported. The results are shown to be totally consistent with measurements reported earlier using the instrument designed for lower pressures.

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“…The first approach (originally proposed by Tough et al [1]) is to start the wire oscillating near resonance and then switch off the driving current, the viscosity being calculated based on the rate at which the amplitude of the oscillation diminishes. This is sometimes called the "ring down" method.…”

Section: Introductionmentioning

confidence: 99%

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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Vibrating Wire Viscometer

Abstract: A microfluidic vibrating wire viscometer for operation at high pressure and high temperature Rev. Sci. Instrum. 82, 035113 (2011);

Cited by 94 publications

References 2 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

Vibrating-wire viscometers for liquids at high pressures

Magnetic Damping Effects in Forced-Oscillation Vibrating-Wire Viscometers

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