Boundary skin friction and sediment transport about an animal-tube mimic |
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| Authors: | James E Eckman†Arthur R M Nowell‡ |
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| Institution: | Marine Sciences Research Center, State University of New York, Stony Brook, NY 11794, U.S.A.;School of Oceanography, WB-10, University of Washington, Seattle, WA 98195, U.S.A. |
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| Abstract: | ABSTRACT
A flume study was made of fluid flow, boundary skin friction, and sediment transport about an animal-tube mimic. The effect of a tube on momentum transfer depends most strongly on its height. A tube increases the net boundary skin friction locally and tends to promote sediment entrainment near its base. Flow in this region appears to be governed by the same similarity laws that apply to cylinders with much larger body Reynolds number. Particles travelling as suspended load may be deposited immediately downstream of the tube. The net sedimentological effect of any tube (i.e. deposition or scour) will depend both on its height and on the boundary shear stress imposed by the external flow. The near-wake region of a tube is dominated by a strong cross-stream exchange of momentum. Wake perturbations decay downstream seemingly in accordance with similarity laws which also govern mounted, two-dimensional structures. |
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