Abstract
An external pressure wave generated by a magnetic hammer is applied to a single or multiple hot LiNO 3 drops which have been in stable film boiling in subcooled ethanol. The process of vapor film collapse triggered by the pressure wave is studied by photographic observations and pressure history measurements. The vapor film begins to destabilize about 0.1 ms after pressure wave arrival at the drop. About 1.0 to 1.5 ms later, the vapor film begins to collapse from the lower part. Collapse of the vapor film develops from a portion around the drop preceded by a complex destabilization process. The ripple waves generated from a portion in the initial stage are concluded to be due to a Rayleigh-Taylor instability. Generation of interface disturbance and that of tiny bubbles as well as that of hot liquid fragments are observed, though no penetration of cold liquid jets can be observed in these experimental conditions
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