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Apr 26, 2012
Characteristics of Turbulent Plumes Using PLIF Technique
Authors: S. Rahman, L. P. Dasi, D. R. Webster, and P. J. W. RobertsAuthor Affiliations
Publication: Building Partnerships
Abstract
The characteristics of a chemical plume diffusing in a fully developed turbulent open channel flow are measured using the planar laser-induced fluorescence (PLIF) technique. The plume is released iso-kinetically 25.4mm above the floor, thus mixing is mainly due to ambient turbulence. The focus of the study is to better understand how animals such as blue crabs use chemical sensory information to track a turbulent plume to its source. Statistical properties of concentration, such as the mean and variance, are not useful for tracking because the necessary time records are too long. This study provides new insight into the instantaneous concentration distributions in the plume and their properties that may be useful for tracking. In particular, it appears, that a spatial cross-correlation in the spanwise direction can provide unique positional information.
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© 2000 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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S. Rahman
School of Civil & Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0355
L. P. Dasi
School of Civil & Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0355
D. R. Webster
School of Civil & Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0355
P. J. W. Roberts
School of Civil & Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0355
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