Breakup of a Finite-Length Liquid Jet
These simulations include the presence of the orifice (finite-length jet)
for arbitrary time-dependent massflow history. Actual orifice internal
geometry can also be included in the simulations.
Dripping Flow
The BEM simulations reproduce chaotic behavior observed in dripping
flows. Surface wave interactions with the orifice flow influence
a given droplet's formation.
51 kB jpg
QuickTime Movie 1.9 MB
Rayleigh Jet Breakup with Fixed Wavelength Perturbations
Droplet sizes from Rayleigh jet simulations are in close agreement
with experimental measurements. Nonlinear effects cause a given
wavelength disturbance to subdivide into ``main'' and ``satellite''
droplets.
QuickTime Movie 890 kB
QuickTime Movie 1.2 MB
The simulations/images shown in the references below document
the effect of disturbance magnitude, wavenumber (i.e. wavelength),
jet speed (i.e. Weber number), and gravity (i.e. Bond number).
Disturbance Magnitude 38 kB jpg
Wave Number 44 kB jpg
Weber Number 40 kB jpg
Bond Number 50 kB jpg
Large Magnitude Perturbations
Jets under large-amplitude perturbations form ``candlestick''
structures due to the fact that the column of liquid outside
the orifice ``buckles'' as a result of higher velocity fluid
exiting the passage at a given point in the disturbance.
QuickTime Movie 880 kB
Stephen D. Heister -- heister@roger.ecn.purdue.edu
July 1, 1996
51 kB jpg