Non-self-similar, linear dynamics during pinch-off of a hollow annular jet
Non-self-similar, linear dynamics during pinch-off of a hollow annular jet
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DOI：
10.1063/1.1793631
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发表时间：
2004-10
影响因子：
4.6
通讯作者：
Ronald Suryo;P. Doshi;O. Basaran
中科院分区：
文献类型：
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作者：
Ronald Suryo;P. Doshi;O. Basaran
基于对小粘度液滴(射流)在大粘度环境流体中破碎的实验和计算研究，Doshi等人。[Science 302,1185(2003)]已经表明，零粘度的液滴(射流)在非常粘性的环境流体中破裂会产生一种意想不到的、非普遍形式的奇点。Doshi等人。推测非万能动力学是由内部流体施加的压力可以忽略的事实造成的。为了验证这一猜想，并克服与模拟系统有关的计算困难，在模拟系统中，内外流体的粘度相差很大，分析了核心为可忽略粘度的气体的环状射流的破裂。计算表明，当射流的最小半径Hmin为0时，核侧压力和壳侧压力都是有界的，而表面张力压力由壳体流体施加的粘性法向应力平衡，表面张力压力发散为1/→。模拟结果表明，界面位移量随温度的变化而变化。
Based on an experimental and computational study of the breakup of a drop (jet) of small viscosity in an ambient fluid of large viscosity, Doshi et al. [Science 302, 1185 (2003)] have shown that the breakup of a drop (jet) of zero viscosity in a very viscous ambient fluid gives rise to an unexpected, nonuniversal form of singularity. Doshi et al. conjectured that the nonuniversal dynamics result from the fact that stresses exerted by the inner fluid are negligible. To verify this conjecture and overcome computational difficulties associated with simulating systems in which the disparity between the viscosities of the inner and the outer fluids is large, the breakup of an annular jet whose core is a gas of negligible viscosity is analyzed. Calculations show that as the jet’s minimum radius hmin→0, both core- and shell-side pressures remain bounded while surface tension pressure, which diverges as 1/hmin, is balanced by viscous normal stress exerted by the shell fluid. Simulations show that interfacial poin...