Abstract
The occurrence of the instability of a radial flow of thin liquid film is investigated. Two regions of flow field were considered. One is the region in which a boundary layer grows in a downstream direction, and the other is the region in which the whole flow is a boundary layer. For the former region, Orr-Sommerfeld equation was solved numerically by means of a modified Kaplan method, with the assumption of Blasius's and Watson's velocity profile. For the latter, O-S equation was replaced by a difference system, and solved taking account of 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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