scholarly journals EFFECT OF WALL SHEAR ON PARTICLE MOTION IN SEDIMENT LADEN OPEN CHANNEL FLOW

2000 ◽  
Vol 44 ◽  
pp. 647-652
Author(s):  
Kazuhiro FUJISAKI ◽  
Kou TANAKA
Keyword(s):  
Channel Flow ◽  
Particle Motion ◽  
Open Channel ◽  
Open Channel Flow ◽  
Wall Shear

Groyne spacing role on the effective control of wall shear stress in open-channel flow

2018 ◽  
Vol 57 (2) ◽  
pp. 167-182 ◽  
Author(s):  
Theofano I. Koutrouveli ◽  
Athanassios A. Dimas ◽  
Nikolaos Th. Fourniotis ◽  
Alexander C. Demetracopoulos
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Effective Control ◽  
Wall Shear

The wall shear velocity, u*, in fixed and eroded beds of 180°-curved open channel flow

2014 ◽  
pp. 1089-1096
Author(s):  
B Kironoto ◽  
B Yulistiyanto ◽  
D Legono ◽  
P Sangging
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Shear Velocity ◽  
Wall Shear

Lagrangian Model for a Single Saltating Grain in the Near-Wall Region of an Open-Channel Flow

2014 ◽  
Vol 60 (1-4) ◽  
pp. 31-50 ◽  
Author(s):  
Włodzimierz Czernuszenko
Keyword(s):  
Turbulent Flows ◽  
Channel Flow ◽  
Particle Motion ◽  
Open Channel ◽  
Open Channel Flow ◽  
Lagrangian Model ◽  
Published Data ◽  
Wall Region ◽  
Particle Collisions ◽  
Wide Range

Abstract A mathematical model for the continuous saltation of a particle near the granular bed in an open-channel flow is developed in detail. The model is based on the Lagrangian equations governing particle motion, and it takes into account the following forces: drag, lift, gravitation, virtual mass and the force responsible for particle-particle interactions. A model of particle-particle collisions is developed and used to determine the mean impulsive force acting upon a particle flowing and rebounding from the channel bed. The model can simulate the continuous saltation trajectories of a single particle in the near-bed region of turbulent flows, in which particle motion is controlled by collisions. The model has been calibrated and verified with available published data in a rather wide range of grain sizes from 0.53 mm to 15 mm. All parameters, such as lift, drag, restitution, friction coefficients and roughness height, have been set on the basis of a reanalysis of these published data.

scholarly journals Measurement of Wall Shear Stresses of Open-Channel Flow by PTV

1998 ◽  
Vol 18 (Supplement1) ◽  
pp. 133-136
Author(s):  
Ichiro Fujita ◽  
Motoki Hara ◽  
Takeharu Nakashima
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Shear Stresses ◽  
Wall Shear

MODELING THE ORGANIC REMOVAL AND OXYGEN CONSUMPTION BY BIOFILMS IN AN OPEN-CHANNEL FLOW

1994 ◽  
Vol 30 (2) ◽  
pp. 53-61 ◽  
Author(s):  
Shiyu Li ◽  
Guang Hao Chen
Keyword(s):  
Water Quality ◽  
Oxygen Consumption ◽  
River Water ◽  
Channel Flow ◽  
Diffusion Layer ◽  
Open Channel ◽  
Open Channel Flow ◽  
River Water Quality ◽  
Monod Kinetics ◽  
Organic Removal

A mathematical model is proposed to predict the removal of dissolved organic substances and the consumption of dissolved oxygen by attached biofilms in an open-channel flow. The model combines the biofilm equations with the conventional Streeter–Phelps type equations of river water quality by considering the mass transfer of organics and oxygen in the river water through the diffusion layer into the biofilm. It is assumed that the diffusion and reaction within the biofilm are of steady-state, and follow Monod kinetics. The model is solved numerically with a trial-and-error method. The simulation results of the model for an ideal case of river flow and biofilm show that the organic removal rate and oxygen consumption rate caused by the biofilm are greater than that by suspended biomass. The effects of diffusion layer thickness, flow velocity, and biofilm thickness on the change of river water quality are discussed.

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