scholarly journals Experiment on Flow-Velocity Profile and Sediment Motion in Transition Process from Saltation to Sheetflow

1997 ◽  
Vol 41 ◽  
pp. 825-830
Author(s):  
Tetsuo SAKAI ◽  
Hitoshi GOTOH ◽  
Abbas YEGANEH-BAKHTIARY
Keyword(s):  
Velocity Profile ◽  
Flow Velocity ◽  
Transition Process ◽  
Flow Velocity Profile

Investigation of the influence of the flow structure on the accuracy of flow measurement before a hydrometric structure in an open channel

2020 ◽  
pp. 41-44
Author(s):  
Anatoly Kusher
Keyword(s):  
Velocity Profile ◽  
Flow Velocity ◽  
Water Flow ◽  
Flow Measurement ◽  
Water Discharge ◽  
Critical Depth ◽  
Flow Measurements ◽  
Study Results ◽  
Flow Velocity Profile ◽  
Upstream Flow

The reliability of water flow measurement in irrigational canals depends on the measurement method and design features of the flow-measuring structure and the upstream flow velocity profile. The flow velocity profile is a function of the channel geometry and wall roughness. The article presents the study results of the influence of the upstream flow velocity profile on the discharge measurement accuracy. For this, the physical and numerical modeling of two structures was carried out: a critical depth flume and a hydrometric overfall in a rectangular channel. According to the data of numerical simulation of the critical depth flume with a uniform and parabolic (1/7) velocity profile in the upstream channel, the values of water discharge differ very little from the experimental values in the laboratory model with a similar geometry (δ < 2 %). In contrast to the critical depth flume, a change in the velocity profile only due to an increase in the height of the bottom roughness by 3 mm causes a decrease of the overfall discharge coefficient by 4…5 %. According to the results of the numerical and physical modeling, it was found that an increase of backwater by hydrometric structure reduces the influence of the upstream flow velocity profile and increases the reliability of water flow measurements.

scholarly journals Flow Velocity Profile of Micro Counter-Current Flows

2007 ◽  
Vol 23 (2) ◽  
pp. 131-133 ◽  
Author(s):  
Arata AOTA ◽  
Akihide HIBARA ◽  
Kyosuke SHINOHARA ◽  
Yasuhiko SUGII ◽  
Koji OKAMOTO ◽  
...  
Keyword(s):  
Velocity Profile ◽  
Flow Velocity ◽  
Flow Velocity Profile ◽  
Current Flows ◽  
Counter Current

Fiber-coupled self-mixing diode-laser Doppler velocimeter: technical aspects and flow velocity profile disturbances in water and blood flows

1994 ◽  
Vol 33 (24) ◽  
pp. 5628 ◽  
Author(s):  
M. H. Koelink ◽  
F. F. M. de Mul ◽  
A. L. Weijers ◽  
J. Greve ◽  
R. Graaff ◽  
...  
Keyword(s):  
Velocity Profile ◽  
Flow Velocity ◽  
Diode Laser ◽  
Laser Doppler ◽  
Laser Doppler Velocimeter ◽  
Technical Aspects ◽  
Blood Flows ◽  
Flow Velocity Profile

Biphasic Cerebral Blood Flow Velocity Profile in Patients With Aneurysmal Subarachnoid Hemorrhage

2004 ◽  
Vol 1 (4) ◽  
pp. 455-460 ◽  
Author(s):  
Andreas R. Luft ◽  
Manuel M. Buitrago ◽  
Michel Torbey ◽  
Anish Bhardwaj ◽  
Alexander Razumovsky
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Subarachnoid Hemorrhage ◽  
Velocity Profile ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Cerebral Blood Flow Velocity ◽  
Aneurysmal Subarachnoid Hemorrhage ◽  
Flow Velocity Profile
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