Sub-critical flow in open channel junction

2004 ◽  
pp. 393-400
Author(s):  
A Behrangi ◽  
S Borghei ◽  
A Daemi
Keyword(s):  
Open Channel ◽  
Critical Flow

scholarly journals Free-surface flows with near-critical flow conditions

1996 ◽  
Vol 23 (6) ◽  
pp. 1272-1284 ◽  
Author(s):  
H. Chanson
Keyword(s):  
Free Surface ◽  
Channel Flow ◽  
Open Channel ◽  
Flow Instability ◽  
Open Channel Flow ◽  
Surface Characteristics ◽  
Free Surface Flows ◽  
Critical Flow ◽  
Flow Conditions ◽  
Weir Flow

Open channel flow situations with near-critical flow conditions are often characterized by the development of free-surface instabilities (i.e., undulations). The paper develops a review of several near-critical flow situations. Experimental results are compared with ideal-fluid flow calculations. The analysis is completed by a series of new experiments. The results indicate that, for Froude numbers slightly above unity, the free-surface characteristics are very similar. However, with increasing Froude numbers, distinctive flow patterns develop. Key words: open channel flow, critical flow conditions, free-surface undulations, flow instability, undular surge, undular broad-crested weir flow, culvert flow.

Division of critical flow at three-branch open-channel intersection

2011 ◽  
Vol 49 (2) ◽  
pp. 231-238 ◽  
Author(s):  
Kamal El Kadi Abderrezzak ◽  
Leszek Lewicki ◽  
André Paquier ◽  
Nicolas Rivière ◽  
Gilbert Travin
Keyword(s):  
Open Channel ◽  
Critical Flow

scholarly journals Calculation of critical flow depth using method of algebraic inequality

2018 ◽  
Vol 66 (3) ◽  
pp. 316-322 ◽  
Author(s):  
Tiejie Cheng ◽  
Jun Wang ◽  
Jueyi Sui
Keyword(s):  
Specific Energy ◽  
Open Channel ◽  
Critical Flow ◽  
Polynomial Equations ◽  
Critical Depth ◽  
Nonuniform Flow ◽  
Flow Depth ◽  
Inequality Theory ◽  
Calculation Process ◽  
Calculation Results

Abstract To calculate the critical depth and the least specific energy of steady non-uniform flows in open channels, one has to solve the polynomial equations. Sometimes, the polynomial equations are too difficult to get them solved. In this study, the theory of algebraic inequality has been used to derive formulas for determining the critical depth and the least specific energy of a steady non-uniform flow in open channel. The proposed method has been assessed using examples. Results using this new method have been compared to those using other conventional methods by engineers and scientists. It is found that the proposed method based on algebraic inequality theory not only makes the calculation process to be easy, but also gives the best calculation results of the critical depth and the least specific energy of a steady nonuniform flow.

Critical flow condition in open channel hydraulics

1985 ◽  
Vol 54 (3-4) ◽  
pp. 157-179 ◽  
Author(s):  
W. H. Hager
Keyword(s):  
Flow Condition ◽  
Open Channel ◽  
Critical Flow ◽  
Channel Hydraulics

Flow Rate Limits in Surface Tension Dominated Open Channel Flows: An Efficient Design Tool

2008 ◽  
Author(s):  
Joerg Klatte ◽  
Mark M. Weislogel ◽  
Michael Dreyer
Keyword(s):  
Free Surface ◽  
Flow Rate ◽  
Open Channel ◽  
Design Tool ◽  
Channel Flows ◽  
Critical Flow ◽  
Efficient Design ◽  
Open Channel Flows ◽  
Capillary Channel ◽  
Critical Flow Rate

In the present study a forced liquid flow through an open capillary channel is investigated. Due to the interplay between inertial and viscous forces the pressure along the flow path decreases causing the free surface to bend inwards the open channel. Because the curvature of the free surface is in turn dependent on the channel pressure a maximum flow rate is achieved beyond which the free surface collapses and gas ingestion occurs. This critical flow rate depends intricately on the channel geometry and liquid properties. A new numerical method has been developed to predict the pressure, free surface curvature, and velocity parameters for such open capillary channel flows with constant flow rates. The solver is able to calculate the critical flow rate for various channel geometries and can be used as an efficient design tool for open channel flows in capillary systems. As a demonstration, the method is validated herein via parabolic flight and drop tower experiments.

Open-channel-block induced by the neurotransmitter glycine in homomeric alpha1-GlyR and heteromeric alpha1/beta1- GlyR

2008 ◽  
Vol 35 (S 01) ◽  
Author(s):  
Y.P Song ◽  
F Schlesinger ◽  
S Petri ◽  
R Dengler ◽  
K Krampfl
Keyword(s):  
Open Channel ◽  
Channel Block ◽  
Open Channel Block
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