Effect of Size stream Nuclei on Inception of Cavitation

概要

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For studying the mechanism of the inception of cavitation, especially the inception of cavitation by stream bubble nuclei, it is important to know and/or to control the size of bubbles contained in water. It is found out that the minute bubbles can be filtered as if they are solids by special filter paper under moderate pressure difference. Using this filtering method for controling the size of bubbles in water, the relation between the size of bubble and the critical pressure of inception of cavitation of water in a glass nozzle is studied and it is found out that this relation is shown by a simple equation introduced by a theory of mechanically critical balance at the interface of the gas and the liquid of a bubble. Then using this theory the distribution of bubble diameter in water is measured. It is found that the degassed water does not have always small number and small size of bubbles, i.e.. the air content in water has no interrelationship with the number and/or the size of bubbles.
社団法人日本船舶海洋工学会の論文