Abstract
A new method for excitation and measurement of time stationary, free running waves on wetting films is described. The waves in the frequency range of 10–140 Hz are generated by an oscillating bubble against a quartz plate in a Derjaguin–Scheludko film balance. The results from the experimentally measured dispersion equation are compared with a theoretical model based on the lubrication approximation. It is shown that there are significant discrepancies between experiment and theory which cannot be explained by the classical DLVO-theory as well as by the assumption of a non-slip boundary condition.
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