Helical Surface Instability of Cylindrical Liquid Jet in Cocurrent Gas Stream

概要

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Helical surface instability of a cylindrical liquid jet in a cocurrent uniform gas stream was investigated theoretically and experimentally. The results according to the linear instability theory showed that a nonaxisymmetric wave disturbance could grow enough for a large relative velocity between the liquid jet and the gas stream. When the relative velocity became larger than a specified value, the shape of the liquid jet changed from "axisymmetric mode" to "helical mode". A helical disturbance on the liquid surface grew over the down-ward liquid column and broke up into droplets. About the frequency of the helical disturbance, the theoretical results agreed well with the experimental results. It was also found that the helical disturbance relates closely to the fluid flow conditions.
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