並行気流中における円筒状液体噴流界面のら旋状不安定変動

抄録

Helical surface instability of a cylindrical liquid jet in a cocurrent uniform gas stream were investigated theoretically and experimentally. The results of 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". The helical disturbance on the liquid surface over the downward liquid column and broke up into droplets. For the frequency of the helical disturbance, the theoretical results agreed well with the experimental results. It was also found that the relation of the helical disturbances to the fluid Flow conditions.