Experimental Study on Influences of Kinematic Viscosity on Occurences of Cavitation Due to Sub-Surface Vortex

Abstract

In order to clarify the influence of kinematic viscosity (ν) 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°C and 80°C (ν : 1.3x10-6 to 3.7x10-6m2/s).The velocity fields around vortex were also measured by Particle Image Velocimetry. The influence of ν was observed under relatively high ν conditions. However, that influence diminished with the increase of νor suction velocity. And also, normalized circulation Γ* was found as an index to estimate such influences of ν or suction velocity on the vortex cavitation.