Pinch-Off Modes and Satellite Formation in Liquid-Liquid Jet Systems
by
Milosevic, I.N. and Longmire, E.K.
in
International Journal of Multiphase Flow, 28 (11), 1853-1869, 2002.
Category: Journal Article
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Abstract:
Forced jets of glycerin/water solution flowing into silicone oil were investigated. Forcing amplitudes were sufficient to induce stable or semi-stable pinch-off modes in the jet. The indices of refraction in the two liquids were matched, and planar slices of flow were visualized using laser induced fluorescence. Twodimensional velocity fields were obtained by particle image velocimetry (PIV). For a viscosity ratio, gi=go ¼ 1:6, satellites form at lower Reynolds numbers as well as lower Strouhal numbers. Satellite occurrence depends on the interface shape approaching pinch-off as well as the detailed velocity gradients surrounding the pinch-off region. Satellite formation required a zone of concave curvature downstream of but close to the jet neck as pinch-off approached. This zone was associated with intense vorticity that first deformed the interface into an upstream-facing cone attached to the main drop and then deformed the cone into a satellite shape. Increasing the ambient viscosity suppressed satellite formation for the Reynolds and Strouhal numbers examined.
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