scholarly journals Optimization of water flow speed in dams

2021 ◽  
Vol 1122 (1) ◽  
pp. 012031
Author(s):  
Lusiana Tarihoran ◽  
Tulus ◽  
Sawalluddin
Keyword(s):  
Water Flow ◽  
Flow Speed

Structure Design of the ANSYS-Based SLC9-2-Type Direct Reading Current Meter

2014 ◽  
Vol 926-930 ◽  
pp. 1412-1416
Author(s):  
Shi Ming Wang ◽  
Zhen Wang ◽  
Qing Yi He ◽  
Jie Zhang ◽  
Yu Qing Zhang
Keyword(s):  
Water Flow ◽  
Flow Measurement ◽  
Simulation Analysis ◽  
Flow Speed ◽  
Structure Design ◽  
Measurement Instruments ◽  
Ansys Software ◽  
Direct Reading ◽  
Simulation Results ◽  
The Impact

SLC9-2-type direct reading; current meter is a lightweight, reliable, affordable, low consumption of the new flow measurement instruments, available for measuring the different depth of water flow speed and direction in the ocean, bays, rivers, lakes, reservoirs, estuaries . By improving its structure, using the simulation analysis of ANSYS software, it analyzes the new structure on the impact of lowing start. Simulation results for the actual SLC9-2-type direct reading current meter provide guidance for new design.

scholarly journals ON THE EFFECT OF WATER FLOW SPEED TO HYDRODYNAMIC RESISTANCE FORCE OF GILLNET; MODEL NET EXPERIMENTS IN THE FLUME TANK

2017 ◽  
Vol 16 (2) ◽  
pp. 103
Author(s):  
Bambang Murdiyanto ◽  
Desty Maryam ◽  
Hasan Basri
Keyword(s):  
Water Flow ◽  
Flow Speed ◽  
Hydrodynamic Resistance ◽  
Resistance Force ◽  
Effect Of Water

When gillnet is operated in the sea its will encounter the effects of seawater current and tidal movements. The shape and construction of the gillnet will be effected by the direction and flow speed of the seawater current. When the current is strong enough the gillnet shape could be changing, falling down or even roll up.

scholarly journals Outer Hinged Blades Vertical Shaft Kinetic Turbine Flow Pattern Visualization

2020 ◽  
Vol 9 (4) ◽  
pp. 499-502
Keyword(s):  
Turbine Blade ◽  
Water Flow ◽  
Power Plants ◽  
Flow Behavior ◽  
Flow Speed ◽  
Energy Utilization ◽  
Back Side ◽  
Energy Potential ◽  
Remote Areas ◽  
Visual Observations

The Micro hydro power plant (MHPP) development can be used to supply electricity to people living in remote areas. Because the electricity needed in this area is usually not too big. In remote areas and located far from the electricity transmission network, electricity supplies from small capacity power plants is needed, especially those that utilize renewable local energy potential. The energy utilization as electricity generation is by utilizing available kinetic energy (water potential and water flow speed). The research carried out experimentally and then optimized with Response Surface Methodology. The optimization results are then tested again so as to obtain verification results from the optimization value. Furthermore, based on the value of optimization, visual observations are made to see the flow behavior that occurs on the outside hinged blade and turbine chamber. From the visual observations, it was found that not all the water flow hit the turbine blade surface. On the blade back side, the water flow that hits the turbine blade will increase the turbine rotation. On the blade front side, the water flow that hits the outer blade will open the blade and the water flow will come out immediately from the turbine so that it will reduce the negative torque or back rotation.

scholarly journals Studi Kecepatan Aliran Air dengan Menggunakan Tabung Pitot

2018 ◽  
Vol 5 (1) ◽  
pp. 14
Author(s):  
Muhammad Taufik Iqbal ◽  
Zulvyah Faisal
Keyword(s):  
Flow Velocity ◽  
Water Flow ◽  
Flow Rate ◽  
Open Channel ◽  
Flow Analysis ◽  
Distribution Channel ◽  
Research Process ◽  
Flow Speed ◽  
Water Flow Velocity ◽  
Speed Distribution

The tools and methods used in the measurement of water flow velocity are now very diverse, such as by using Venturi Meter, Orifice, Current Meter, Pitot Tube, and so forth. To learn more about water flow velocity measurement method, in order to improve professionalism in the field of water resources can be done research at Hydraulics Laboratory by researching Water Flow Analysis by Using Pitot Tubes. The research process will be carried out using three varied channel basis samples: reviewing the velocity of the water flow at the bottom of the channel with slippery base, reviewing the flow rate of the water on the gravel base channel, and reviewing the flow rate of the water on the channel with the decking concrete base. The expected result of this research is knowing the distribution of velocity in a cross section such as drainage channel, irrigation channel and river, so construction of water structure can be adjusted position placement in the open channel section. In addition it can be used as a reference in planning an open channel. One of the benefits to construction cofferdam construction speed distribution is to determine the dewatering system to be carried out during construction.Keywords— Flow Speed, Speed Distribution. Channel Basic Variations

An experimental investigation of pulsating turbulent water flow in a tube

1971 ◽  
Vol 46 (1) ◽  
pp. 43-64 ◽  
Author(s):  
J. H. Gerrard
Keyword(s):  
Reynolds Number ◽  
Velocity Profile ◽  
Water Flow ◽  
Cylindrical Tube ◽  
Flow Speed ◽  
Mean Flow ◽  
Mean Velocity ◽  
Central Plateau ◽  
Transition Range ◽  
The Mean

Experiments were made on a pulsating water flow at a mean flow Reynolds number of 3770 in a cylindrical tube of diameter 3·81 cm. Pulsations were produced by a piston oscillating in simple harmonic motion with a period of 12 s. Turbulence was made visible by means of a sheet of dye produced by electrolysis from a fine wire stretched across a diameter. The sheet of dye is contorted by the turbulent eddies, and ciné-photography was used to find the velocity of convection which was shown to be the flow speed except in certain circumstances which are discussed. By subtracting the mean flow velocity profile the profile of the component of the motion oscillating at the imposed frequency was determined.The Reynolds number of these experiments lies in the turbulent transition range, so that large effects of laminarization are observed. In the turbulent phase, the velocity profile was found to possess a central plateau as does the laminar oscillating profile. The level and radial extent of this were little different from the laminar ones. Near to the wall, the turbulent oscillating profile is well represented by the mean velocity power law relationship, u/U ∝ (y/a)1/n. In the laminarized phase, the turbulent intensity is considerably reduced at this Reynolds number. The velocity profile for the whole flow (mean plus oscillating) relaxes towards the laminar profile. Laminarization contributes appreciably to the oscillating component.Extrapolation of the results to higher Reynolds numbers and different frequencies of oscillation is suggested.

scholarly journals A Flow-Induced Structure-Based Kinetic Energy Harvester

2017 ◽  
Author(s):  
Guangcheng Zhang ◽  
Yueh-Jaw Lin ◽  
Christian Klumpner
Keyword(s):  
Kinetic Energy ◽  
Cantilever Beam ◽  
Water Flow ◽  
Energy Harvester ◽  
Fiber Composite ◽  
Flow Direction ◽  
Flow Speed ◽  
Fixed End ◽  
Induced Structure ◽  
Center Distance

In this paper, a strategy utilizing a pair of cylinders which are put on both sides of the cantilever beam and perpendicular to the water flow direction to harvest the energy is demonstrated. The novel flow-induced structure-based energy harvester consists of a pair of inducing objects (cylinders) and one L-type cantilever beam. Macro fiber composite (MFC) is attached at the fixed end of the cantilever beam to convert the kinetic energy into electric power. The structure could induce the vortex shedding from the upstream flow and harvest the energy from it. Compared with the former studies regarding one or series layout inducing objects, the proposed structure could both improve the power output of the flow-induced energy harvester and avoid the damage happening in complex working conditions. Analytical modelling and experiment methods are both utilized in the research to cross verify the results. The characteristics related with water flow speed and center distance variations between inducing objects are discussed in the paper as well. It is found that when the water flow speed is 0.2m/s and the center distance is 30mm, the output power is optimal of 0.16μW and the power density is 0.4mW/m2.

The Influence of Seawater Velocity to the Corrosion Rate and Paint Degradation at Mild Steel Plate Immersed in Sea Water

2014 ◽  
Vol 554 ◽  
pp. 218-221 ◽  
Author(s):  
Manuhutu Ferry ◽  
W.B. Wan Nik ◽  
Che Wan Mohd Noor
Keyword(s):  
Corrosion Rate ◽  
Mild Steel ◽  
Flow Velocity ◽  
Water Flow ◽  
Steel Plate ◽  
Sea Water ◽  
Electrochemical Impedance ◽  
Flow Speed ◽  
Plate Surface ◽  
Water Flow Velocity

Mild steel is one of the materials that used to build ships and other marine construction which go through current, streams, waves with different speed. The aim of this study is to investigate the effect of seawater flow speed on the corrosion rate of mild steel and the paint thickness degradation. The simulation is done at laboratory scale using mild steel coupons exposure under different flow velocity of seawater that are 2 m/s, 4 m/s, 6 m/s and as control is used stationary flow, 0 m/s. Electrochemical impedance spectroscopy is used to determine the corrosion rate occurred on the coupons plate surface and its paint degradation as function of immersion time. Scanning electron microscopy also is used to observe the plate surface rust and the damage of paint which occurred during the experiment. Experiment is run for thirty days for every water flow speed and the data is taken every ten days. The result of this study revealed that the corrosion rate and paint degradation are increased by the increasing of water flow velocity which is proposed to validate seawater flow rate as parameter that increased the paint damage and corrosion rate of mild steel plate.

Experimental Investigation on Enhancive Effect of Hydrodynamic Cavitation

2013 ◽  
Vol 781-784 ◽  
pp. 2865-2869
Author(s):  
Jie Deng ◽  
Ai He Wang ◽  
Cai Wen Wang
Keyword(s):  
Methylene Blue ◽  
Experimental Investigation ◽  
Free Radicals ◽  
Water Flow ◽  
Flow Speed ◽  
Cavitation Number ◽  
Hydrodynamic Cavitation ◽  
Experimental Unit ◽  
Operating Parameters ◽  
Pressure Discharge

Based on the principle of hydraulics,an effective equipment of hydrodynamic cavitation is designed and built in this paper.The orifice plates with various geometry size were used as hydrodynamic cavitation generator to study the relation ship between many factor,such as,inlet pressure,discharge,flow speed in orifice,and the cavitation number.Analysis of water flow cavitation status for the experimental unit,this device can produce cavitation phenomenon.The methylene blue and spectrophotometer method can capture the free radicals generated successfully.This is an effective way to measuring the free radicals quantitatively in cavitation,moreover it is easy to fulfill.The intensity of cavitation increases with reduction in the cavitation number.By analyzing the influence of cavitation number on concentrations of •OH.It would be strength of hydrodynamic cavitation.The effect of operating parameters,such as inlet press,low speed in orifice and optimum the structure of hydrodynamic cavitation,best condition of the hydrodynamic cavitation is the inlet press、flow speed in orifice 14 m/s、 0.07.

scholarly journals Gerusan Lokal yang Terjadi di Hilir Bendung dan Upaya Pengendaliannya

2014 ◽  
Vol 9 (2) ◽  
pp. 74
Author(s):  
Wisafri -
Keyword(s):  
Water Flow ◽  
Laboratory Experiments ◽  
Flow Speed ◽  
Sand Particle ◽  
Dam Construction ◽  
Bottom Part ◽  
Scouring Depth ◽  
Dam Operation ◽  
Additional Water ◽  
Different Characteristics

Majarity of damages on the dam construction in Indonesia is caused by continuous local scouring at the end side of the dam construction. It grows and reach its lower/bottorm part. It could results in degradation in the dam operation safety. This local scouring was caused by major water flowing passing the dam where there is a high difference level between the top and the end of the dam. Furthermore, it generates inbalancing water flow speed and additional water turbulence. There are different approachs to prevent such damage, and for example by providing one or more additional construction at the end part of the dam. This structure is designed and installed at the bottom part of the dam. Various empirical functions have been developed to design this structure, and one of them is developed by Lacey. The function is reprsented by D = 0.47 * (Q/F)1/2 (D= scouring depth, Q= Discharge, F= the size of the sand particle). However, that function has some limitation. For examples are the local river and dam construction characteristics. Therefore, it is required to be validated by developing a model of dam contructed in a laboratory. Experiments was undertaken by using the model with different characteristics of water flow in order to investigate the scouring pattern, and than method prefentif work

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