Evaluation of Mixing Energy in Laboratory Flasks Used for Dispersant Effectiveness Testing
Publication: Journal of Environmental Engineering
Volume 132, Issue 1
Abstract
The evaluation of dispersant effectiveness used for oil spills is commonly done using tests conducted in laboratory flasks. The success of a test relies on replication of the conditions at sea. We used a hot wire anemometer to characterize the turbulence characteristics in the swirling flask (SF) and the baffled flask (BF), the latter is being considered by the Environmental Protection Agency to replace the prior. We used the measurements to compute the velocity gradient, and the energy dissipation rate per unit mass, . The study shows that the mixing in the BF is more uniformly distributed than that in the SF. Flask average energy dissipation rates in the SF were about 2 orders of magnitude smaller than those in the BF. The sizes of the microscales in the BF were found to be much smaller than that in the SF. Also, in the BF, the sizes of the microscales approached the size of oil droplets observed at sea , which means that the turbulence in the BF closely resembles the turbulence occurring at sea during breaking waves. Hence, the BF is preferable for dispersant testing in the laboratory.
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Acknowledgment
This research was supported, in part, by the U.S. Environmental Protection Agency through Contract No. UNSPECIFIEDPR-OH-01-00381. However, no official endorsement of the results should be implied.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 132 • Issue 1 • January 2006
Pages: 93 - 101
Copyright
© 2005 ASCE.
History
Received: Nov 18, 2003
Accepted: Apr 11, 2005
Published online: Jan 1, 2006
Published in print: Jan 2006
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