粘性複合ジェットの定式化と安定性(波動(3),一般講演)

概要

論文の詳細を見る
We analytically examine breakup phenomena of a viscous compound liquid jet which consists of a core and a surrounding annular liquid jet. Applying the long wave approximations to the basic equations and the boundary conditions, we derive reduced nonlinear equations for large deformation of the jet. Numerical analysis of the equations is performed for a semi-infinite jet when linearly unstable disturbances are applied to a nozzle exit from which the liquids are emanating. It is shown that breakup of the jet in the downstream brings about the encapsulation of the core liquid by the surrounding one, whose profile becomes more sensitive to the surface tension ratio of the inner to the outer interface as long as the Reynolds number is large. However, it is found for smaller Reynolds number that the core jet flow is choked at a bottle neck of the jet due to the instability, which causes ballooning of the annular jet.
日本流体力学会の論文
2008-09-04