Results 121 to 130 of about 22,970 (166)

Effective Thermal Conductivity of Rough Spheres Packed Bed

Heat Transfer: Volume 1, 2003
The effective thermal conductivity, ke, rigorously defined on the basis of the local volume averaging method, is an important parameter in porous media. The experimental and numerical results available in literature demonstrate that the kevalue is influenced by several parameters such as thermal and mechanical properties of the multiphase porous medium,
VANOLI L., Buonanno G., Caritenuto A., Giovinco G.   +3 more
openaire   +4 more sources

Influence of bed surface roughness on flow in rough-bed rivers

Riverbed surface roughness (or topography) modulates channel hydrodynamics, including the velocity and turbulence distributions, which underpin flood risk and sediment transport. Our recent research has presented the diversity of bed surface roughness found in bedrock and boulder-bed channels, prompting an investigation into the subsequent ...
Robert Houseago, Rebecca Hodge, Rob Ferguson, Stephen Rice, David Whitfield, Christopher Hackney, Richard Hardy, Joel Johnson, Trevor Hoey, Elowyn Yager, Taís Yamasaki   +10 more
openaire   +2 more sources

Geometric bed roughness and the bed state storm cycle

Journal of Geophysical Research, 2011
[1] Temporal variation in the geometric roughness of the mobile sandy seabed during wave forcing events is investigated as a function of bed state. The bed states include irregular ripples, cross ripples, linear transition ripples, and flat bed, each appearing repeatedly within a different range of wave energies, as part of the bed state storm cycle ...
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Measurement and analysis of alluvial bed roughness

Journal of Hydraulic Research, 2004
Abstract Techniques for measurement and analysis of the physical roughness of alluvial beds are introduced and evaluated. Precise digital elevation models (DEMs) of bed surfaces are developed using laser-scanning technology. Hydraulic roughness is represented by the standard deviation of local bed surface heights, which can be measured by physical ...
Graeme Smart, Jochen Aberle, Maurice Duncan, Jeremy Walsh   +3 more
openaire   +1 more source

Movable Bed Roughness in Alluvial Rivers

Journal of Hydraulic Engineering, 1999
A method for the prediction of a movable bed roughness coefficient is proposed by relating the roughness parameter \iA to the nondimensional shear stress τ\u′\i\db/τ\i\dc\d5\d0 and the Froude number of flow. This relationship is tested with a large number of flume and field data from different sources, and also compared with other prediction methods ...
Weiming Wu, Sam S. Y. Wang
openaire   +1 more source

Bed roughness produced by saltating sediment

Journal of Geophysical Research: Oceans, 1989
Several expressions for characterizing bed roughness produced by a layer of saltating sediment have previously been proposed, and another is presented herein. These expressions relate the magnitude of the bottom roughness to the thickness of the near‐bed layer of saltating particles.
Patricia L. Wiberg, David M. Rubin
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On sea bed roughness variability in presence of a rippled bed

2003
Barcelona ...
FARACI C, MALARKEY J, FOTI, Enrico, DAVIES A. G.   +3 more
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Modelling Dynamic Bed Roughness Associated with Bed Form Development

2009
In this study bed form development was quantified and used to calculate a dynamic bed roughness parameter. An algorithm that can be readily implemented into numerical models was developed and evaluated for two scenarios, with distinct flow conditions and sediment carrying capacities.
W B Rauen, B Lin, R A Falconer
openaire   +1 more source

Roughness in Fixed-Bed Streams

2017
The solid boundaries of a natural watercourse are usually composed of earth, sediments, and vegetation of different species, which together determine the resistance to the flow of water. From a hydraulic point of view, these parameters are treated as equivalent roughness.
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Surface roughness: capturing rough-bed river diversity

Channel geometry and bed surface roughness modulate the flow resistance of river channels, which is fundamental to the conveyance of water and sediment. In rough-bed rivers, where the flow is shallow relative to roughness height, there is notable uncertainty in flow resistance calculations based on sediment percentiles (D50 or D84) or the standard ...
Robert Houseago, Rebecca Hodge, Rob Ferguson, Rich Hardy, Chris Hackney, Steve Rice, Joel Johnson, Elowyn Yager, Trevor Hoey, Taís Yamasaki   +9 more
openaire   +2 more sources