Review. The Classical Drama of France. Moore, W. G.

Knight, R. C.

doi:10.1093/fs/26.2.193

Cited by 1 publication

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“…Representative results for the highly elastic systems (for which the dynamic viscosity drops sharply with frequency from the zero-frequency value) are given in figure 6. We see that there is good agreement between the rheometer and the rheogoniometer results, any slight discrepancy which is apparent being attributable to the lag of the hydrodynamically driven inner member of the rheometer due to the friction in the bearing and an effect due to the offset (cf 11, Knight andWalters 1972, R I Tanner 1972, private communication). ?…”

Section: Resultsmentioning

confidence: 71%

“…In 11, a comparison of theoretical and experimental results indicated the need to take into account the very severe end-effects which are present in the rheometers, and also to reduce bearing friction to an absolute minimum, so that the free-running inner member was rotating with an angular velocity which was as near as possible to that of the driven outer member (see also Knight and Walters 1972). When this was carried out, it was…”

Section: Introductionmentioning

confidence: 99%

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Some suggestions for new rheometer designs: III. Anomalous results for highly viscous fluids

Bowen

Broadbent

Walters

1973

J. Phys. D: Appl. Phys.

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In this paper, certain anomalous effects are investigated which appear when results recorded on the eccentric-cylinder and displaced-hemisphere rheometers are compared (cf parts I and II) with results obtained from oscillatory tests on a Weissenberg rheogoniometer. These irregularities are prominent in highly viscous, nearly Newtonian, and elastico-viscous liquids, and it will be shown how they occur in direct contrast to results taken for more mobile systems. Interpretation of experimental results for highly viscous fluids from the rheometers suggests that the fluids are less viscous and more elastic than would be indicated by the rheogoniometer results.For a given material these irregular effects increase with rotational speed, while for a constant rotational speed, they increase for increasingly viscous fluids. The zero-shear viscosity in the case of the elastico-viscous systems does not appear to be a significant factor; it is rather the dynamic viscosity appropriate to the operating frequency which determines the extent of the irregular effects.Various possible causes of the anomalous effects are systematically eliminated, and it is ultimately concluded that they are due to `cavitation' effects in the new rheometers.

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Section: Resultsmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%