AM05-16-013 複合液体ジェットの安定性と崩壊現象(波動・音・衝撃波3,一般講演)

概要

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We analytically examine nonlinear behavior of a compound liquid jet consisting of a liquid core surrounded by an annular jet. Using the long-wave approximation, nonlinear evolution equations are derived for the jet in the absence of surrounding fluids. Linear analysis shows that temporal growth rate for the para-sinuous mode decreases as the density ratio of the core to the annular part increases. Whereas spatial instability for the para-sinuous mode appears when the relative main flow velocity of the annular part becomes larger than unity. Numerical analysis for large deformation of the jet shows that there exists two types of breakup, that is, the sealing-off for which the radius of the core tends to zero and the disintegration which occurs when thickness of the annular part vanishes. The jet tends to collapse due to the disintegration and the breakup time is delayed, if the density ratio becomes large.
日本流体力学会の論文
2005-09-05