EFFECT OF VIBRATIONS ON THE MOTION OF SMALL GAS BUBBLES IN A LIQUID
THOMPSON RAMO WOOLDRIDGE INC LOS ANGELES CA
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An understanding has been obtained of the mechanism governing the motion migration of small gas bubbles in vibrated vessels. In case of a rigid tank it was found that the bubbles above a certain level h will rise towards the surface, while those below will sink to the bottom. In the case of elastic vessels the regions have complicated shapes. It is concluded that, if many bubbles are present, clusters of bubbles will collect in certain locations near the wall or bottom. The chief concern here is with the behavior of a single small bubble. This analysis indicates that the region just below the surface should always be one in which bubbles rise towards the surface and vent. The theory therefore does not yet contain the explanation for the streams of small bubbles moving from the surface towards the bottom which were observed at high accelerations. This phenomenon may be caused by the pressure field of the sloshing motion which is present whenever the bubble stream is seen.