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Report No.
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Influences of fluid viscosity on the occurrences of cavitation due to sub-surface vortex

Ezure, Toshiki; Kimura, Nobuyuki; Tobita, Akira; Kamide, Hideki

A fundamental water experiment was performed in a cylindrical tank geometry to investigate the influences of fluid viscosity on the cavitation due to sub-surface vortex (vortex cavitation). In order to clarify the influence of fluid viscosity, the fluid temperature was varied from 10 $$^{circ}$$C to 80 $$^{circ}$$C to change the kinetic viscosity ($$nu$$) of fluid from 1.3$$times$$10$$^{-6}$$ to 3.7$$times$$10$$^{-7}$$m$$^{2}$$/s. The occurrences of vortex cavitation were detected by image analysis on digital images of vortex cavitation captured by a digital CMOS camera. Then, the occurrences of vortex cavitation were evaluated from the relation between the yield fraction curves of vortex cavitation and the cavitation factor under several different $$nu$$ conditions. The experimental results showed that the influence of $$nu$$ was obvious under the large $$nu$$ conditions. However, the influence became smaller according to the decrease of $$nu$$.

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