Experimental analysis of turbulent open channel flow in the near-wake region of a surface-mounted horizontal circular cylinder

2020 ◽  
pp. 194-202
Author(s):  
Kalpana Devi ◽  
Prashanth Reddy Hanmaiahgari
Keyword(s):  
Circular Cylinder ◽  
Channel Flow ◽  
Experimental Analysis ◽  
Open Channel ◽  
Open Channel Flow ◽  
Wake Region ◽  
Near Wake ◽  
Horizontal Circular Cylinder

On the interaction between a turbulent open channel flow and an axial-flow turbine

2013 ◽  
Vol 716 ◽  
pp. 658-670 ◽  
Author(s):  
L. P. Chamorro ◽  
C. Hill ◽  
S. Morton ◽  
C. Ellis ◽  
R. E. A. Arndt ◽  
...  
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Axial Flow ◽  
Open Channel Flow ◽  
Angular Frequency ◽  
High Temporal Resolution ◽  
Wake Region ◽  
Low Frequencies ◽  
Turbulent Flow Structure ◽  
Torque Transducer

AbstractA laboratory experiment was performed to study the dynamically rich interaction of a turbulent open channel flow with a bed-mounted axial-flow hydrokinetic turbine. An acoustic Doppler velocimeter and a torque transducer were used to simultaneously measure at high temporal resolution the three velocity components of the flow at various locations upstream of the turbine and in the wake region and turbine power, respectively. Results show that for sufficiently low frequencies the instantaneous power generated by the turbine is modulated by the turbulent structure of the approach flow. The critical frequency above which the response of the turbine is decoupled from the turbulent flow structure is shown to vary linearly with the angular frequency of the rotor. The measurements elucidate the structure of the turbulent turbine wake, which is shown to persist for at least fifteen rotor diameters downstream of the rotor, and a new approach is proposed to quantify the wake recovery, based on the growth of the largest scale motions in the flow. Spectral analysis is employed to demonstrate the dominant effect of the tip vortices in the energy distribution in the near-wake region and uncover meandering motions.

scholarly journals EXPERIMENTAL ANALYSIS OF THE OPEN CHANNEL FLOW IN CONTINUOUS BENDS

1983 ◽  
Vol 1983 (331) ◽  
pp. 83-94 ◽  
Author(s):  
Nobuyuki TAMAI ◽  
Kouji IKEUCHI ◽  
Akira YAMAZAKI
Keyword(s):  
Channel Flow ◽  
Experimental Analysis ◽  
Open Channel ◽  
Open Channel Flow

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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