せん断流における油中気泡の発生・成長機構

概要

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The effect of shear rate on the inception of gaseous cavitation in a low Reynolds number flow is studied. An experiment is carried out using a two-cylinder apparatus and paraffinic base oil with air dissolved in it as a test fluid. With a low shear rate, the observed inception time is considerably later than the time obtained in a calculation considering only the floating bubbles in the fluid. This fact can be explained by taking into account the slower growth speed of small nucleus attached to the wall, which results from the resistance encountered when the air passes across the interface of the bubbles. It is supposed that when the shear rate of flow becomes high, this resistance suddenly decreases. By considering the behavior of absorbed substances at the interface, the author arrives at a nondimensional parameter determining the shear rate and the size of the bubbles when the sudden change in resistance occurs.
一般社団法人日本機械学会の論文
1989-09-25