Abstract
MCVEIGH1 has construed my statement concerning the novelty of the hysteresis effect in a circular orifice2 rather too literally. With the exception of Grace and Lapple3, all his references are concerned with liquid flows which do not fall within the terms of the generally accepted definition of a compressible fluid. The effect of compressibility in a gas flowing at a Mach number nearly equal to unity can never be achieved in a liquid under normal laboratory conditions. In a flowing gas it is the compressibility that is responsible for the change in the area of the jet which leads to attachment to the wall surface, the hysteresis itself being due to fluid viscosity. In a liquid, other factors such as cavitation may well be the triggering mechanism.
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References
McVeigh, J. C., Nature, 212, 918 (1966).
Deckker, B. E. L., Nature, 209, 604 (1966).
Grace, H. P., and Lapple, C. E., Trans. Amer. Soc. Mech. Eng., 73, 639 (1951).
Deckker, B. E. L., and Chang, Y. F., Thermo. and Fluid Mechanics Convention, 1966 (Inst. Mech. Engrs. (London), Paper No. 7).
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DECKKER, B. Hysteresis in the Flow through an Orifice. Nature 214, 904 (1967). https://doi.org/10.1038/214904a0
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DOI: https://doi.org/10.1038/214904a0
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