Journal
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
Volume 28, Issue 11, Pages 1853-1869Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0301-9322(02)00046-0
Keywords
jet; pinch-off; satellites; PIV; LIF
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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. Two-dimensional velocity fields were obtained by particle image velocimetry (PIV). For a viscosity ratio, eta(i)/eta(o) = 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. (C) 2002 Elsevier Science Ltd. All rights reserved.
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