TURBULENT BEHAVIOR OF FLUIDIZED SEDIMENTS IN COMPOSITE SHEAR FLOW

Ayumi Saruwatari; Wataru Matsuzaki; Yasunori Watanabe

doi:10.9753/icce.v32.sediment.7

No. 32 (2010), Sediment Transport and Morphology

No. 32 (2010)

TURBULENT BEHAVIOR OF FLUIDIZED SEDIMENTS IN COMPOSITE SHEAR FLOW

Sediment Transport and Morphology

https://doi.org/10.9753/icce.v32.sediment.7

Published 2011-01-23

Ayumi Saruwatari⁺⁻
Wataru Matsuzaki⁺⁻
Yasunori Watanabe⁺⁻

Ayumi Saruwatari

Hokkaido University

Wataru Matsuzaki

Hokkaido University

Yasunori Watanabe

Hokkaido University

Proceedings of the 32nd International Conference

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Keywords

granular bottom particles
suspension and fluidization
refractive index matching technique

How to Cite

Saruwatari, A., Matsuzaki, W., & Watanabe, Y. (2011). TURBULENT BEHAVIOR OF FLUIDIZED SEDIMENTS IN COMPOSITE SHEAR FLOW. Coastal Engineering Proceedings, 1(32), sediment.7. https://doi.org/10.9753/icce.v32.sediment.7

Abstract

A particle imaging measurement of granular particles was applied to fluidized and suspended solid particles involved in steady and unsteady shear flows. In this measurement, 42% sodium iodide solution was used as a fluid medium to coincide the refraction index with the transparent bed material (silica gel). Therefore, the vertical distributions of the granular velocity and turbulent behavior within the bed can be measured by tracking the dyed particles mixed with the bed material. The turbulent kinetic energy in the fluidized layer and particle concentration can also be measured using this technique. The turbulence developed over the bed disturbed the bed material, and as a result the surface particles were lifted and suspended. The underlying mechanism of fluidization and suspension of the sediment seabed in complex turbulent shear flow is believed to be understood through further parametric studies based on the present imaging technique.

https://doi.org/10.9753/icce.v32.sediment.7

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References

Lamb, M.P., E. D'Asaro and J.D. Parsons. 2004. Turbulent structure of high-density suspensions formed under waves. J. Geophys. Res., 109, C12026http://dx.doi.org/10.1029/2004JC002355

Manes, C., D. Pokrajac, I. McEwan and V. Nikora. 2009. Turbulence structure of open channel flows over permeable and impermeable beds: A comparative study. Phys. Fluids, 21, 125101.http://dx.doi.org/10.1063/1.3276292

Nielsen, P. 1992. Coastal bottom boundary layers and sediment transport. Advanced Series on Ocean Engineering, 4.

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TURBULENT BEHAVIOR OF FLUIDIZED SEDIMENTS IN COMPOSITE SHEAR FLOW

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