Modelling for fluid flow with Linear Characteristics in Rectangular Open-Channel (original) (raw)

Calibration of Compound Broad Crested Weir For Measurement of Discharge Ms

2017

Experiments were carried out to know the suitability of different shapes of broad crested weirs to replace the conventional method of discharge measurement with the help of venturi-flume. Even the weir used for it, had an indepen0dent use as energy dissipater. A series of laboratory experiments were performed in order to investigate the effects of the lower weir crest and step height of a broad-crested weir of rectangular compound cross section on the values of discharge coefficient, the approach velocity and the modular limit. The dependence of the three values on model parameters was investigated and the quantities were compared with those of the broad crested weir models with rectangular cross section. KeywordsCo-efficient of Discharge, Calibration of Weir,Broad crested weir, Discharge measurement, DepthDischarge relationship.

Head-Discharge Relationships for Rectangular Flat-Crested Slit Weir

2016

The rectangular weir is the most commonly used device in channel and laboratory for flow measurement due to its simplicity. The rectangular sharp-crested slit weir has been shown to be good at measuring small (< 0.005 m 3 /s) flow rates. In this study, the rectangular slit weir concept is extended to find the head-discharge relationship of water flows over a contracted rectangular flat-crested slit weir under free flow conditions. The head-discharge relationship is determined experimentally using a nine different weir heights with 10 mm weir width and 4 mm weir crest thickness at small discharges (< 0.00067 m 3 /s). The experimental data of actual and predicted discharge is verified by using a statistical analysis. A linear regression equation correlating the head-discharge relationship provides an accurate prediction of free flow discharge over the weir to yield results within 2.1% error of actual discharges and have a strong relationship. The presented head-discharge equatio...

Broad-Crested Weir as a Device for Measurement of Discharge

Weirs are overflow structures, which alter the discharge so that flow rate can be calculated, flood can be prevented, or even make a body of water more navigable. Measurements of discharge are known based on the surface profile of the water. For estimation of discharge over the weir, weir coefficient is required. In this report only the broad crested weir is focused on. Design and the analysis of this weir are shown in the report. It was found that the broad-crested weir is best for measuring discharge in small medium channels. Flow over a broad-crested weir is highly dependent on the weir's geometry, it's a useful hydraulic tool which enables engineers to control water height, velocity, and most importantly they can be used to calculate discharge. Hydraulic structures such as weirs, flumes, and pipes, may cause the flow upstream of the structure to rise above the normal flow depth this is a common property.

New Technique for measurement of Discharge in Open channel flow

2017

AbstractUsing the traditional technique for measuring discharge in open channel flow a new technique of discharge measurement is being developed by calibration of venturiflume to facilitate discharge measurement, which will lead the work in efficient way and achieving economy and accuracy. The methodology which is being refined through preparing actual model and proposed model, by using the experimental observations analysing them and preparing graphical output.