Journal ArticleDOI
Velocity Profiles for Particles and Liquid in Open-Channel Flow with Suspended Sediment
Marian Muste,V. C. Patel +1 more
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In this article, a discriminator laser-doppler velocimeter (DLDV) was used to measure the mean velocity and turbulence characteristics in open-channel flows with and without suspended sediment (alluvial sand of nearly uniform size).Abstract:
Experiments were performed to measure the mean velocity and turbulence characteristics in open-channel flows with and without suspended sediment (alluvial sand of nearly uniform size). Velocity measurements were obtained by using a newly developed technique, the discriminator laser-doppler velocimeter (DLDV), which can distinguish both liquid and sediment particle velocities. The mean velocity of sediment particles was found to be lower than that of the water. While the velocity fluctuations in the water were not changed with the addition of sediment, those of the sediment were diminished. For the range of concentrations considered, the friction velocity and the free-surface slope increased with sediment concentration unlike other bulk flow parameters, which were practically constant. A uniform method of analysis was developed to facilitate data interpretation and comparison between similar studies.read more
Citations
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Journal ArticleDOI
On the flocculation and settling velocity of estuarine mud
TL;DR: In this article, a 3D model for the evolution of the settling velocity of cohesive sediments in estuarine and coastal environments is presented, which is the result of turbulence-induced aggregation and floc breakup processes.
Book ChapterDOI
Sediment Transport and Morphodynamics
TL;DR: The ASCE Manual of Practice 110, Sedimentation Engineering, aims at presenting the state of the art concerning the hydraulics of sediment transport in fl uvial systems based on the knowledge gained in the last three decades.
Journal ArticleDOI
Open-Channel Flow Turbulence and Its Research Prospect in the 21st Century
TL;DR: Open-channel turbulence has been studied extensively in the literature as mentioned in this paper, where the concept of local isotropy has proved useful in understanding these flows, such as those in open channels, boundary layers, and pipes.
Journal ArticleDOI
Stratification effects by cohesive and noncohesive sediment
TL;DR: In this paper, the authors studied the effect of sediment-induced buoyancy on the vertical profiles of velocity, vertical eddy viscosity/diffusivity, and Reynolds stresses.
Journal ArticleDOI
Numerical simulation of turbulence and sediment transport of medium sand
TL;DR: In this paper, a model of sand transport in water is produced by combining a turbulence-resolving large eddy simulation (LES) with a discrete element model (DEM) prescribing the motion of individual grains of medium sand.
References
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Book
Boundary layer theory
TL;DR: The flow laws of the actual flows at high Reynolds numbers differ considerably from those of the laminar flows treated in the preceding part, denoted as turbulence as discussed by the authors, and the actual flow is very different from that of the Poiseuille flow.
Book
Open channel flow
TL;DR: The importance of basic principles is recognized in this article in two ways : first, by devoting the opening chapters to a fairly leisurely discussion of introductory principles, including a recapitulation of the underlying arguments derived from the parent subject of fluid mechanics; and second, by takingnevery opportunity in the later chapters to refer back to this earlier material in order to clarify particular applications as they arise.
Principles and practice of laser-Doppler anemometry
TL;DR: In this article, the Doppler Reference Record (DRR) was used for anemometrie a : laser a : anemometry a: laser a: anemometric a: a : a : light anemometer b : laser A : laser
Journal ArticleDOI
Open‐channel Flow Measurements with a Laser Doppler Anemometer
Iehisa Nezu,Wolfgang Rodi +1 more
TL;DR: In this article, it was shown that the log-law can be applied strictly only to the nearwall region and the von K´rm´n constant κ and integral constant A are truly universal, having values of κ=0.412 and A=5.29 irrespective of the Reynolds and Froude number.