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Experimental study on influence of fluid viscosity on occurrences of cavitation due to sub-surface vortex

Ezure, Toshiki; Ito, Kei; Kimura, Nobuyuki; Onojima, Takamitsu; Kamide, Hideki

A fundamental water experiment was performed in the cylindrical tank geometry to clarify the influences of fluid viscosity on the vortex cavitation. The fluid temperature was varied from 10 $$^{circ}$$C to 80 $$^{circ}$$C to control 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 the visualization measurement and image analysis. The experimental results showed that the influence of $$nu$$ was obvious under the large $$nu$$ conditions, while the influence became smaller according to the decrease of $$nu$$. Then, the normalized circulation, $$Gamma$$$$^{*}$$ was installed as an evaluation parameter based on the Burgers Model. As the results, it was observed that occurrences of vortex cavitation in the present geometry could be marshaled on a map by employing $$Gamma$$$$^{*}$$ and cavitation factor.

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