絶対不安定から対流不安定への遷移における流体ジェットの崩壊(対流・拡散・渦・波動波動(3),一般講演)

概要

論文の詳細を見る
Breakup phenomena of a single phase column jet are examined on a set of nonlinear equations derived under the long wave approximation. Critical wave numbers or angular frequencies of disturbances giving the shortest breakup time and/or length of the jet are numerically obtained for each Weber number and magnitude of disturbances. It is found in the convectively unstable region of the Weber number that the breakup time and/or length of the jet in both temporal and spatial evolutions agree well with the results from the linear instability and Gaster's transformation as long as the disturbances are sufficiently small. On the other hand, it is found in the absolutely unstable region that the breakup time in both spatial and temporal evolutions decreases as the Weber number decreases, while the breakup length in the spatial evolution almost remains to be constant without depending on the amplitude of disturbances.
日本流体力学会の論文
2009-09-02