Abstract
AN analysis of data recently put forward by Spiers1, on the flow of oil through engine bearings, shows that the results cannot be reconciled with the usual hypothesis of a viscosity coefficient independent of the velocity gradient. The data indicate that at velocity gradients between 104 and 106 sec.-1, the viscosity coefficient falls down to a small fraction of its normal value. This effect is in agreement with experiments carried out by me in 19372. It is presumably due to orientation under shear, an effect well known for particles of extreme anisometry such as those of cellulose and tobacco mosaic virus.
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References
Spiers, J. Inst. Auto. Eng., vii (Jan., 1941).
Neale, Chem. & Ind., 140, (1937).
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NEALE, S. Anomalous Viscosity of Lubricating Oil at High Velocity Gradients. Nature 149, 51 (1942). https://doi.org/10.1038/149051b0
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DOI: https://doi.org/10.1038/149051b0
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