Viscosity, density, and liquidus temperature of molten Pu-1 wt % Ga alloy

Ofte, D.; Rohr, W.G.

doi:10.1016/0022-3115(65)90184-4

Cited by 9 publications

(5 citation statements)

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“…which yields a viscosity of 6cP at the melting point. This is one of highest viscosities measured for metals; similar to the melting point viscosity of 6.53cP for uranium (Wittenberg [37]) and 5.8cP for iron (Ofte et al [34]). Ofte et al pointed out that the viscosity of plutonium and its fluid flow properties place it in a class of metals whose melting points are substantially higher than that of plutonium.…”

Section: Relevant Properties Of Early Plutonium Reactor Fuelssupporting

confidence: 65%

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Plutonium Metallic Fuels for Fast Reactors

Stan¹,

Hecker²

2007

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an affirmative action/equal opportunity employer, is operated by the Los Alamos National Security, LLC for the National N uclear Security Administration of the U.S. Department of Energy under contract DE-AC 52-06NA25396. By acceptance of this article, the publisher recognizes that the U.S. Government retains a nonexclusive, royalty-free license to publish or reprod uce the published form of this contri bution, or to allow others to do 50 , for U.S. Government purposes. Los Alamos National Lab oratory requests that the publisher identify th is article as work performed under the auspices of the U.S. Department of Energy. Los Alamos National Laboratory strongly supports academic freedom and a researcher's right to publish; as an institution , however, th e Laborato ry does not endorse the viewpoint of a pu blication or guarantee its technical correctness.

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Section: Relevant Properties Of Early Plutonium Reactor Fuelssupporting

confidence: 65%

“…The viscosity of liquid plutonium was measured by Wittenberg and coworkers at the Mound Laboratory [31,32,33,34,35]. Jones et al [36] reported the viscosity of hquid plutonium to follow the relation:…”

Section: Relevant Properties Of Early Plutonium Reactor Fuelsmentioning

confidence: 99%

Plutonium Metallic Fuels for Fast Reactors

Stan¹,

Hecker²

2007

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“…The two governing equation are coupled through the wall shear stress which serves as a boundary condition for (2) and as a forcing function for (1) as shown in (3),…”

Section: Governing Equationsmentioning

confidence: 99%

“…Both are suspended by a thread which functions as an angular spring and the entire assembly is contained within a vacuum [1]. For the uranium-zirconium alloy viscometer, the lower components descend into a furnace which heats the vessel above the melting point of uranium (∼1600 • C), thus requiring the vessel to be composed of tantalum or tungsten [2,3]. The rod-vesselencoder assembly is free to rotate about its axis, and an initial displacement will result in damped harmonic motion.…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo uncertainty estimation for an oscillating-vessel viscosity measurement

Horne¹,

Ban²,

Fielding³

et al. 2012

Metrologia

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This paper discusses the initial design and evaluation of a high temperature viscosity measurement system with the focus on the uncertainty assessment. Numerical simulation of the viscometer is used to estimate viscosity uncertainties through the Monte Carlo method. The simulation computes the system response for a particular set of inputs (viscosity, moment of inertia, spring constant and hysteretic damping), and the viscosity is calculated using two methods: the Roscoe approximate solution and a numerical-fit method. For numerical fitting, a residual function of the logarithmic decay of oscillation amplitude and oscillation period is developed to replace the residual function of angular oscillation, which is mathematically stiff. The results of this study indicate that the method using computational solution of the equations and fitting for the parameters should be used, since it almost always out-performs the Roscoe approximation in uncertainty. The hysteretic damping and spring stiffness uncertainties translate into viscosity uncertainties almost directly, whereas the moment of inertial and vessel-height uncertainties are magnified approximately two-fold. As the hysteretic damping increases, so does the magnification of its uncertainty, therefore it should be minimized in the system design. The result of this study provides a general guide for the design and application of all oscillation-vessel viscosity measurement systems.

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“…The viscosity of liquid plutonium was measured by Wittenberg and coworkers at the Mound Laboratory [30][31][32][33][34]. Jones et al [32] reported the viscosity of liquid plutonium to follow the relation:…”

Section: Relevant Properties Of Early Plutonium Reactor Fuelsmentioning

confidence: 99%