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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Intrusion dynamics of small oil droplets released from a deep ocean blowout
Intrusion dynamics of small oil droplets released from a deep ocean blowout
avior of oil plumes in ambient stratification and current in an inverted framework by releasing a
continuous stream of dense glass beads from a carriage towed in a salt-stratified tank. The distributions of beads,
collected on a bottom sled towed with the source display a Gaussian distribution in the transverse direction and a skewed
distribution in the along-current direction. Dimensions of the distributions are correlated with non-dimensional particle slip
velocity, UN and provide an indication of the signature that oil would have when reaching the surface. We computed the
average settling velocity of particles, Uave, and found that it exceeds the slip velocity of an individual particle, Us. This is
partly attributed to the initial plume velocity near the point of release. In addition, smaller particles exhibit a ˇ°secondary
plume effectˇ± as they exited the intrusion as a swarm. The secondary effect becomes more prominent as UN decreases.
These findings might explain the observations from the 2000 Deep Spill (DS) field experiment where oil was found to
surface more rapidly than predicted based on Us. Preliminary observations suggest that, for the continuous phase, the trap
depth (for particles, or elevation for droplets) is lower in a current than in a quiescent ambient, likely reflecting the increase
in dilution due to crossflow entrainment.Form Required :
File Size : 747,805 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 20/08/2015
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