Electrochemical Determination of Flow Velocity Profile in a Microfluidic Channel from Steady-State Currents: Numerical Approach and Optimization of Electrode Layout

2009 ◽  
Vol 81 (18) ◽  
pp. 7667-7676 ◽  
Author(s):  
Christian Amatore ◽  
Oleksiy V. Klymenko ◽  
Alexander I. Oleinick ◽  
Irina Svir
Keyword(s):  
Steady State ◽  
Velocity Profile ◽  
Flow Velocity ◽  
Microfluidic Channel ◽  
Numerical Approach ◽  
Electrochemical Determination ◽  
Flow Velocity Profile

scholarly journals Turbulence Modeling Using Z-F Model and RSM for Flow Analysis in Z-SHAPE Ducts

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Mohammed Karbon ◽  
Ahmad K. Sleiti
Keyword(s):  
Steady State ◽  
Velocity Profile ◽  
Flow Velocity ◽  
Flow Separation ◽  
Experimental Results ◽  
Mean Flow ◽  
Flow Velocity Profile ◽  
The Mean ◽  
Mean Flow Velocity ◽  
Flow Reattachment

Turbulent flow in Z-shape duct configuration is investigated using Reynolds stress model (RSM) and ζ-f model and compared to experimental results. Both RSM and ζ-f models are based on steady-state RANS solutions. The focus was on regions where the RSM has over- or underpredicted the flow when compared to the experimental results and on regions where there are flow separations and high turbulence. The performance of predicting the flow reattachment length in each model is studied as well. RSM has shown the mean flow velocity profile results match reasonably well with the experiment. Advanced ζ-f turbulence model is introduced as user-defined function (UDF) code and applied to the Z-shape duct. It is found that the turbulent kinetic energy production in ζ equation is much easier to reproduce accurately. Both mean velocity gradient and local turbulent stress terms are also much easier to be resolved properly. The current research has found that not only ζ-f model takes less time to complete the simulation but also the mean flow velocity profile results are in better agreement with the experimental data than the RSM although both are coupled steady-state RANS. ζ-f model numerically resolved both the flow separation and reattachment regions better than the RSM. The current numerical results from ζ-f model are attractive and encouraging for wall-bounded flow applications where flow separation and flow reattachment are important for the flow mechanism.

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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