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Two-phase flow modeling of suspended...

Greimann, Blair Powell.

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Two-phase flow modeling of suspended sediment transport.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Two-phase flow modeling of suspended sediment transport./
作者:	Greimann, Blair Powell.
面頁冊數:	153 p.
附註:	Source: Dissertation Abstracts International, Volume: 60-02, Section: B, page: 0750.
Contained By:	Dissertation Abstracts International60-02B.
標題:	Engineering, Civil. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9917553
ISBN:	0599164417

Two-phase flow modeling of suspended sediment transport.
Greimann, Blair Powell.

Two-phase flow modeling of suspended sediment transport. - 153 p.

Source: Dissertation Abstracts International, Volume: 60-02, Section: B, page: 0750.

Thesis (Ph.D.)--The University of Iowa, 1998.

Using phase weighted averaging, Eulerian equations have been developed that treat sediment and water as two separate, but interacting phases. These equations provide an improved description of turbulent particle diffusion and modification of turbulence by particles. The equations are then applied to the case of two-dimensional sediment-laden flow in an open channel and are used to predict the concentration and velocity profiles of the fluid and sediment.

ISBN: 0599164417Subjects--Topical Terms:

783781
Engineering, Civil.

Two-phase flow modeling of suspended sediment transport.
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245 1 0 $a Two-phase flow modeling of suspended sediment transport.
300 $a 153 p.
500 $a Source: Dissertation Abstracts International, Volume: 60-02, Section: B, page: 0750.
500 $a Supervisor: Forrest M. Holly, Jr.
502 $a Thesis (Ph.D.)--The University of Iowa, 1998.
520 $a Using phase weighted averaging, Eulerian equations have been developed that treat sediment and water as two separate, but interacting phases. These equations provide an improved description of turbulent particle diffusion and modification of turbulence by particles. The equations are then applied to the case of two-dimensional sediment-laden flow in an open channel and are used to predict the concentration and velocity profiles of the fluid and sediment.
520 $a An integrated mixing length model is used to simulate the Reynolds stresses in the fluid. This accounts for the fact that sediment has a cumulative damping effect on the mixing length. Near the bed, where concentrations are large, the mixing length is gradually decreased from its clear-water value. Far from the bed, where the concentrations are small, no additional damping takes place. Therefore, in this area the velocity profile seems to follow the log-law with a decreased von Karman parameter.
520 $a The two-phase flow model shows that the particles' vertical turbulent velocity fluctuations increase particle diffusion. The increase in diffusion is proportional to the particle time scale and this explains the increased vertical diffusion that several researchers have found experimentally for large particles. Comparisons with experiments show that the two-phase flow model simulates particle diffusion more accurately than traditional models, especially near the bed and for large particles.
520 $a Recent experimental evidence has also shown that the averaged particle horizontal velocity lags that of the fluid by a measurable amount. Current theories cannot account for the observed magnitude of this lag. The two-phase flow model explains that this velocity lag of particles results from the correlation of particles with low velocity fluid in the horizontal direction. This causes the averaged velocity of particles to be less than that of the fluid. The new two-phase flow model predicts that the magnitude of this lag is of the order of the particle fall velocity.
590 $a School code: 0096.
650 4 $a Engineering, Civil. $3 783781
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650 4 $a Biology, Limnology. $3 1018638
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791 $a Ph.D.
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