scholarly journals HYdraulic Characteristics of The Flow through Open Channel with Dead Zone

1984 ◽  
Vol 28 ◽  
pp. 167-172
Keyword(s):  
Open Channel ◽  
Dead Zone ◽  
Hydraulic Characteristics ◽  
Flow Through

Stabilization of the Speed of the Hydraulic Motor Through Throttle Compensation for Volume Losses

2020 ◽  
Vol 26 (3) ◽  
pp. 126-130
Author(s):  
Krasimir Kalev
Keyword(s):  
Flow Rate ◽  
Hydraulic Drive ◽  
Pressure Change ◽  
Operating Conditions ◽  
Drive System ◽  
Inlet Pressure ◽  
Schematic Diagram ◽  
Hydraulic Characteristics ◽  
Hydraulic Motor ◽  
Flow Through

AbstractA schematic diagram of a hydraulic drive system is provided to stabilize the speed of the working body by compensating for volumetric losses in the hydraulic motor. The diagram shows the inclusion of an originally developed self-adjusting choke whose flow rate in the inlet pressure change range tends to reverse - with increasing pressure the flow through it decreases. Dependent on the hydraulic characteristics of the hydraulic motor and the specific operating conditions.

Simulation of Supercritical Bend Flow through an Open Channel

2016 ◽  
Vol 15 (0) ◽  
pp. 22
Author(s):  
Rupak Saha ◽  
Sanchayan Mukherjee ◽  
Ajay Kumar Das ◽  
Kanhu Keshab Jena ◽  
Manajit Mandal ◽  
...  
Keyword(s):  
Open Channel ◽  
Flow Through ◽  
Bend Flow

scholarly journals Fuzzy rules based model for solute dispersion in an open channel dead zone

2002 ◽  
Vol 4 (1) ◽  
pp. 39-51
Author(s):  
Helen Kettle ◽  
Keith Beven ◽  
Barry Hankin
Keyword(s):  
Finite Volume ◽  
Fuzzy Number ◽  
Open Channel ◽  
Transverse Velocity ◽  
Dead Zone ◽  
Fuzzy Rules ◽  
Turbulent Velocity ◽  
Velocity Fluctuations ◽  
Laboratory Flume ◽  
The Mean

A method has been developed to estimate turbulent dispersion based on fuzzy rules that use local transverse velocity shears to predict turbulent velocity fluctuations. Turbulence measurements of flow around a rectangular dead zone in an open channel laboratory flume were conducted using an acoustic Doppler velocimeter (ADV) probe. The mean velocity and turbulence characteristics in and around the shear zone were analysed for different flows and geometries. Relationships between the mean transverse velocity shear and the turbulent velocity fluctuations are encapsulated in a simple set of fuzzy rules. The rules are included in a steady-state hybrid finite-volume advection–diffusion scheme to simulate the mixing of hot water in an open-channel dead zone. The fuzzy rules produce a fuzzy number for the magnitude of the average velocity fluctuation at each cell boundary. These are then combined within the finite-volume model using the single-value simulation method to give a fuzzy number for the temperature in each cell. The results are compared with laboratory flume data and a computational fluid dynamics (CFD) simulation from PHOENICS. The fuzzy model compares favourably with the experiment data and offers an alternative to traditional CFD models.

Predictions of bulk velocity for open channel flow through submerged vegetation

2020 ◽  
Vol 32 (4) ◽  
pp. 795-799
Author(s):  
Wei-jie Wang ◽  
Xiao-yu Cui ◽  
Fei Dong ◽  
Wen-qi Peng ◽  
Zhen Han ◽  
...  
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Bulk Velocity ◽  
Submerged Vegetation ◽  
Flow Through

Turbulent Flow Through Spacer Grids in Rod Bundles

1998 ◽  
Vol 120 (4) ◽  
pp. 786-791 ◽  
Author(s):  
Sun Kyu Yang ◽  
Moon Ki Chung
Keyword(s):  
Turbulent Flow ◽  
Laser Doppler Velocimetry ◽  
Hydraulic Characteristics ◽  
Rod Bundles ◽  
Spacer Grid ◽  
Spacer Grids ◽  
Rod Bundle ◽  
Turbulence Decay ◽  
Skewness Factor ◽  
Flow Through

The effects of the spacer grids with mixing vanes in rod bundles on the turbulent structure were investigated experimentally. The detailed hydraulic characteristics in subchannels of a 5 × 5 rod bundle with mixing spacer grids were measured upstream and downstream of the spacer grid by using a one component LDV (Laser Doppler Velocimetry). Axial velocity and turbulent intensity, skewness factor, and flatness factor were measured. The turbulence decay behind spacer grids was obtained from measured data. The trend of turbulence decay behaves in a similar way as turbulent flow through mesh grids or screens. Pressure drop measurements were also performed to evaluate the loss coefficient for the spacer grid and the friction factor for a rod bundle.

Pool-orifice and pool-orifice-weir fishways

1989 ◽  
Vol 16 (5) ◽  
pp. 774-777 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
A. Mainali
Keyword(s):  
Open Channel ◽  
Open Channel Flow ◽  
Technical Note ◽  
Total Flow ◽  
Total Flow Rate ◽  
Vertical Slot ◽  
Flow Hydraulics ◽  
Orifice Flow ◽  
Flow Through ◽  
Submerged Orifice

This technical note presents a method of analyzing the flow in pool-orifice fishways by dividing it into vertical slot and submerged orifice flow regimes. For a pool-orifice-weir fishway, with flow through the orifice as well as over the weir, a method has been suggested for predicting the total flow rate in the fishway. Experimental observations are presented in support of these methods. Key words: open-channel flow, hydraulics, fishways, turbulent flow.

scholarly journals Voltage-Controlled Gating at the Intracellular Entrance to a Hyperpolarization-Activated Cation Channel

2002 ◽  
Vol 119 (1) ◽  
pp. 83-91 ◽  
Author(s):  
Brad S. Rothberg ◽  
Ki Soon Shin ◽  
Prashant S. Phale ◽  
Gary Yellen
Keyword(s):  
Open Channel ◽  
Cardiac Cells ◽  
Hcn Channels ◽  
Hcn Channel ◽  
Channel One ◽  
Blocking Rate ◽  
Activation Gate ◽  
Flow Through ◽  
Controlled Structure ◽  
Pore Lining

Hyperpolarization-activated cation (HCN) channels regulate pacemaking activity in cardiac cells and neurons. Our previous work using the specific HCN channel blocker ZD7288 provided evidence for an intracellular activation gate for these channels because it appears that ZD7288, applied from the intracellular side, can enter and leave HCN channels only at voltages where the activation gate is opened (Shin, K.S., B.S. Rothberg, and G. Yellen. 2001. J. Gen. Physiol. 117:91–101). However, the ZD7288 molecule is larger than the Na+ or K+ ions that flow through the open channel. In the present study, we sought to resolve whether the voltage gate at the intracellular entrance to the pore for ZD7288 also can be a gate for permeant ions in HCN channels. Single residues in the putative pore-lining S6 region of an HCN channel (cloned from sea urchin; spHCN) were substituted with cysteines, and the mutants were probed with Cd2+ applied to the intracellular side of the channel. One mutant, T464C, displayed rapid irreversible block when Cd2+ was applied to opened channels, with an apparent blocking rate of ∼3 × 105 M−1s−1. The blocking rate was decreased for channels held at more depolarized voltages that close the channels, which is consistent with the Cd2+ access to this residue being gated from the intracellular side of the channel. 464C channels could be recovered from Cd2+ inhibition in the presence of a dithiol applied to the intracellular side. The rate of this recovery also was reduced when channels were held at depolarized voltages. Finally, Cd2+ could be trapped inside channels that were composed of WT/464C tandem-linked subunits, which could otherwise recover spontaneously from Cd2+ inhibition. Thus, Cd2+ escape is also gated at the intracellular side of the channel. Together, these results are consistent with a voltage-controlled structure at the intracellular side of the spHCN channel that can gate the flow of cations through the pore.

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