High performance dc-dc conversion with voltage multipliers

Harrigill, W. T.; Myers, I. T.

doi:10.1109/pesc.1974.7074330

Cited by 3 publications

(2 citation statements)

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“…The wire density at other temperatures and pressures was calculated from Young’s modulus of the wire material was expressed as a function of temperature (only) by means of the relation where E 0 = E ( T 0 ) and ε w is a temperature coefficient assumed to be constant. E 0 and ε w were obtained from a careful review and analysis of the available literature data on the elastic constants of tungsten. − It was observed that the values of Young’s modulus reported in the literature varied somewhat depending upon whether the sample was monocrystalline or polycrystalline. Values of E 0 /GPa –1 for monocrystalline samples of 409.8, 409.4, and 409.1 were reported by Featherston and Neighbors, Bolef and de Klerk, and Armstrong and Brown, respectively, while values of 401.7, 403.3, 402.7, and 395 were reported for polycrystalline samples by Lowrie and Gonas, Bernstein, Armstrong and Brown, and Harrigill and Krsek …”

Section: Methodsmentioning

confidence: 99%

“…E 0 and ε w were obtained from a careful review and analysis of the available literature data on the elastic constants of tungsten. − It was observed that the values of Young’s modulus reported in the literature varied somewhat depending upon whether the sample was monocrystalline or polycrystalline. Values of E 0 /GPa –1 for monocrystalline samples of 409.8, 409.4, and 409.1 were reported by Featherston and Neighbors, Bolef and de Klerk, and Armstrong and Brown, respectively, while values of 401.7, 403.3, 402.7, and 395 were reported for polycrystalline samples by Lowrie and Gonas, Bernstein, Armstrong and Brown, and Harrigill and Krsek Figure shows values of E / E 0 for both mono- and polycrystalline tungsten as a function of temperature.…”

Section: Methodsmentioning

confidence: 99%

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Viscosities and Densities of Binary Mixtures of Hexadecane with Dissolved Methane or Carbon Dioxide at Temperatures from (298 to 473) K and at Pressures up to 120 MPa

2016

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We report measurements of the viscosity and density of two binary mixtures comprising hexadecane with dissolved carbon dioxide or methane over the temperature range from (298.15 to 473.15) K and at pressures up to 120 MPa. The measurements were conducted at various mole fractions x of the light component as follows: x = (0, 0.0690, 0.5877 and 0.7270) for xCO2 + (1 -x)C16H34 and x = (0, 0.1013, 0.2021, 0.2976 and 0.3979) for xCH4 + (1 -x)C16H34. The viscosity and density measurements were carried out simultaneously using a bespoke vibrating-wire apparatus with a suspended sinker. With respect to the first mixture, the apparatus was operated in a relative mode and was calibrated in octane whereas, for the second mixture, the apparatus was operated in an absolute mode. To facilitate this mode of operation, the diameter of the centreless-ground tungsten wire was measured with a laser micrometer, and the mass and volume of the sinker were measured independently by hydrostatic weighing. In either mode of operation, the expanded relative uncertainties at 95 % confidence were 2 % for viscosity and 0.3 % for density. The results were correlated using simple relations that express both density and viscosity as functions of temperature and pressure. For both pure hexadecane and each individual mixture, the results have been correlated using the modified Tait equation for density, and the Tait-Andrade equation for viscosity; both correlations described our data almost to within their estimated uncertainties.In an attempt to model the viscosity of the binary mixtures as a function of temperature, density and composition, we have applied the extended-hard-sphere model using several mixing rules for the characteristic molar core volume. The most favourable mixing rule was found to be one based on a mole-fraction-weighted sum of the pure component molar core volumes raised to a power γ which was treated as an adjustable parameter. In this case, deviations of the experimental viscosities from the model were within ±25 %.

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