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The generation of capillary instabilities on a liquid jet. (English) Zbl 0602.76047

The coupling between imposed disturbances and capillary instabilities on a liquid jet is examined. It is shown that in most physical situations the forcing produces neutral waves which can then turn into growing waves as the profile relaxes or may be amplified nonlinearly by a mechanism of the type considered. The effectiveness of the coupling is expressed quantitatively by numerically computed values of the ’coupling coefficient’.

MSC:

76E17 Interfacial stability and instability in hydrodynamic stability
76E99 Hydrodynamic stability
76M99 Basic methods in fluid mechanics
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