Abstract
This paper deals with an experimental study on the flow visualization of cavitation for steady and unsteady flows in cylindrical chokes of oil hydraulics. Experiments for the steady and unsteady flows are carried out following the methods used in the previous paper. In the previous paper, the behavior of cavitating bubbles was clarified with an ultrahigh-speed camera changing the diameter of the cylindrical choke for a condition in which the choke length was kept constant. In this study, experiments are performed in many more combinations of the diameter, length and chamfered length of the cylindrical choke. Also, the incipient and choking cavitation numbers are obtained observing with the naked eye for steady flow. It becomes clear that the cavitation form which occurs in the long choke and the large inner diameter can be classified clearly into three ones ; seat, bubble and cloud cavitations, and the various behaviors are observed by changing in size and shape of the cylindrical choke.
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