0109 粘性複合ジェットの非線形安定性と崩壊(OS1-2 噴流,後流および剥離流れ現象の解明と制御,オーガナイズドセッション)

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概要

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• We analytically examine the nonlinear instability and breakup phenomena of a viscous compound liquid jet which consists of core and surrounding annular phases. Applying the long wave approximations to both phases, a set of reduced nonlinear equations is derived for large deformations of the jet. Breakup phenomena are numerically examined when sinusoidal disturbances are fed at the end of the semi-infinite jet. Typical breakup profiles are shown for the surface tension ratios and Reynolds numbers. In particular, for sufficiently small Reynolds number, the core phase is found to be choked at a bottle neck of the jet, which is followed by ballooning of the annular phase in the upstream. It is shown that there exit the most unstable frequencies of input disturbances for each parameters of the surface tension, viscosity and amplitudes of disturbances. From variations of the breakup time and distance for such frequencies, it is expected that there exists a critical Weber number, above which the jet becomes convectively unstable and below which absolutely unstable.

• 一般社団法人日本機械学会の論文
• 2010-10-29

著者

• 吉永 隆夫

  大阪大学

• 吉永 隆夫

  阪大

• 山本 健太郎

  阪大

関連論文

• 0109 粘性複合ジェットの非線形安定性と崩壊(OS1-2 噴流,後流および剥離流れ現象の解明と制御,オーガナイズドセッション)
• 1026 長波近似による複合ジェットの定式化とカプセル形成周期(OS-5 可変形性境界を含む流れ(3))
• 1024 平面液体ジェットの安定性に及ぼす壁面,重力及び3次元性の影響(OS-5 可変形性境界を含む流れ(3))
• 複合液体ジェットのモデル化とカプセル化

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