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Report No.

Experimental study on influences of kinematic viscosity on occurrences of cavitation due to sub-surface vortex

Ezure, Toshiki; Kimura, Nobuyuki; Kobayashi, Jun; Kamide, Hideki

In order to clarify the influence of kinematic viscosity ($$nu$$) on the occurrence of vortex cavitation, a water experiment was carried out in a cylindrical tank with a suction pipe. The occurrences of vortex cavitation were measured under several fluid temperature conditions between 10$$^{circ}$$C and 80$$^{circ}$$C ($$nu$$ : 1.3$$times$$10$$^{-6}$$ to 3.7$$times$$10$$^{-6}$$m$$^{2}$$/s). The velocity fields around vortex were also measured by Particle Image Velocimetry. The influence of $$nu$$ was observed under relatively high $$nu$$ conditions. However, that influence diminished with the decrease of $$nu$$ or the increase of suction velocity. And also, normalized circulation $$Gamma$$$$^{*}$$ was found as an index to estimate such influences of $$nu$$ or suction velocity on the vortex cavitation.



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