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Why is the tensile strength of water measured dynamically less than that measured statically?

H N V Temperley and D H Trevena

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LETTER TO THE EDITOR

The tensile strength of water measured dynamically is less than that measured statically. It is claimed that this anomaly, which has been known for a long time, can be accounted for if one assumes that the transition layer at the free surface of a liquid contains a region for which the effective velocity of sound is very small. This region should be a source of cavitation nuclei, thus lowering the tensile strength. The hydrodynamics of reflection of pressure pulses by such a region are investigated and the imperfect reflection of pressure pulses by the free surface observed by Sedgewick and Trevena (1976) can be explained on the same hypothesis.


PACS

62.10.+s Mechanical properties of liquids

47.85.Dh Hydrodynamics, hydraulics, hydrostatics

62.60.+v Acoustical properties of liquids

Subjects

Soft matter, liquids and polymers

Fluid dynamics

Dates

Issue 8 (14 August 1987)



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