Abstract
The occurence of the instability of a radial flow of thin liquid film is investigated. Two regions of flow field were considered. The one is the region in which a boundary layer grows in a downstream direction, and the other is the region in which the whole of the flow is a boundary layer. For the former region, Orr-Sommerfeld equation was solved numerically by means of the modified Kaplan method, with the assumption of Blasius's and of Watson's velocity profile. For the latter, O-S equation was replaced by a difference system, and solved taking account the free surface condition for Blasius's and Watson's profile. In experiments, the wall pressure was measured, which was followed by spectral analysis. The pressure fluctuation frequency due to the disturbance wave was compared with the linear stability theory.
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