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TECHNICAL BRIEFS

Capturing the Pinch-Off of Liquid Jets by the Level Set Method

J. Fluids Eng 125(5), 922-927 (Oct 07, 2003) (6 pages) doi:10.1115/1.1598986 History: Received August 21, 2002; Revised March 28, 2003; Online October 07, 2003
Copyright © 2003 by ASME
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Figures

Grahic Jump Location
The iso-surface of liquid density from instantaneous flow field by numerical simulations. Mesh: Δx/D=Δy/D=Δz/D=3.125×10−2; domain: 52Δx×52Δy×400Δz. The jet diameter D is resolved by 32 grid points. (a) Case I (μio=0.17, Re=34) (b) Case II (μio=1.72, Re=35.2).
Grahic Jump Location
One cycle of jet disintegration for Case I (μio=0.17, Re=34). The time interval between the images is 1/9T. The pinchoff (t=0) is the second in each series. The images from computation show the iso-surface (three-dimensional) of zero level set function θ=0. (a) Experiment (reprinted from 4, copyright(2001), with permission from Elsevier Science). (b) Computation: Δx/D=Δy/D=Δz/D=6.667×10−2. (c) Computation: Δx/D=Δy/D=Δz/D=3.125×10−2.
Grahic Jump Location
The radial profiles of axial velocity at an axial location (z/D=6.15) for Case I (μio=0.17, Re=34) at different time during one cycle of disintegration. Symbols and lines represent the experimentally measured data and numerically calculated values, respectively. The phase corresponds to pinch is ϕ=0.
Grahic Jump Location
The axial velocity along the centerline of the jet for Case II (μio=1.72, Re=35.2), at different time during one cycle of disintegration. Symbols and lines represent the experimentally measured data and numerically calculated values, respectively. The time corresponds to pinch is t=0 and the phases 0T,7/9T, respectively, correspond to ϕ=0, 280.
Grahic Jump Location
The radial profiles of axial velocity at a axial location (z/D=6) for Case II (μio=1.72, Re=35.2) at different time during one cycle of disintegration. Symbols and lines represent the experimentally measured data and numerically calculated values, respectively. The time corresponds to pinch off is t=0 and the phases 17/18T,1/18T,1/6T, respectively, correspond to ϕ=340, 20, 60.
Grahic Jump Location
One cycle of jet disintegration for Case II (μio=1.72, Re=35.2). The time interval between the images is 1/9T. The pinchoff (t=0) is the second in each series. The plots from computation show the contours (two-dimensional) of zero level set function θ=0 projected onto an azimuthal plane cutting through the axis of the jet. (a) Experiment (reprinted from 4, copyright (2001), with permission from Elsevier Science). (b) Computation: Δx/D=Δy/D=Δz/D=6.667×10−2. (c) Computation: Δx/D=Δy/D=Δz/D=3.125×10−2.
Grahic Jump Location
The axial velocity along the centerline of the jet for Case I (μio=0.17, Re=34), at different time during one cycle of disintegration. Symbols and lines represent the experimentally measured data and numerically calculated values, respectively. The phase corresponds to pinch is ϕ=0.

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