The venturi measuring unit is designated below as the venturi channel meter, in order to clearly distinguish it from the venturi pipe meter. Civil engineering lab ii group 3 hydraulics 1 hd 1. This is placed between the two sections of the venturi and adjusted to clamp them against the side walls of the channel. The experiments indicate that the venturi flume will be free from interference due to changes in the. Notable factors in comparing application of the venturi solution to a pipe meter with using the venturi solution on a longthroated flume are the magnitude of head differential observed as flow moves from the approach section, then is accelerated through the constricted throat sections.
Figure shows the plan and elevation of a venturiflume. Charateristics of flow through a venturi flume objective the purpose of this experiment is to determine the relationship between upstream head and flow rate for water flowing through a venture flume and determine the discharge coefficient and observe the flow patterns. Fm 308 flow measurement by venturi and orifice meter objectives. Flume experiments on the transport of a coarse sand by garnett p. To find the coefficient of discharge for venturi meter.
Hd 1 r1 civil engineering lab iigroup 3 hydraulics 1. To transition the flow out of a parshall flume, wing walls should be used. Flow through venturi meter background and theory introduction flow meters are used in the industry to measure the volumetric flow rate of fluids. Venturi flume for measuring water in open channels, in order that those in practical need. Flow measurement with long throated flumes under uncertain. A simple, inexpensive venturi experiment applying the. Homework statement a venturi flume is formed in a horizontal rectangular channel 1.
Differential pressure type flow meters head flow metersmeasure flow rate by introducing a constriction in the flow. Venturiflume 1 venturiflume it is a devise used to measure the discharge in an open channel. It was thought that the flume might be converted into a selfcontained measuring device by placing a restricted section in the flume, which would cause a. It mentions venturi flume advantages or benefits and venturi flume disadvantages or drawbacks. Broad crested weirventuriflume almost same procedure the chairman lukongo ngenge. An experimental investigation of the aeration performance of. The main objectives of this experiment is to obtain. The experiments were conducted for 26 different modified venturi flumes and 1 parshall flume. Structural analysis vol 2 by bhavikatti pdf 28 download.
More specifically, this simple venturi meter, constructed from materials available at a local hardwareauto parts store, was characterized by determining the venturi coefficient and. Submerged flow condition due to adverse pipe slopes or flow during backwater conditions are accurately measured. Three simple flumes for flow measurement in open channels. Flow measurement ii hydromechanics vvr090 flow measurements in flumes use of flumes might be preferrable to measure flow rate compared to weirs. The unit is designed for installation in the modular flow channel hm162. The inlet diameter equals d 26 mm and the throat diameter d 16 mm. Flow through a venturi flume on232w3z3jl0 documents and e. A type of open flume with a contracted throat that causes a drop in the hydraulic gradeline. Experimental and cfd analysis of flow through venturimeter. Kashibai navale college of engineering, pune, maharashtra, india amar pandhare department of mechanical engineering smt.
A particularly attractive version of such a device is a standingwave flume, as this enables determination of liquid discharge by onepoint. Experimental and cfd analysis of flow through venturimeter to. The flat converging section floor and the straight vertical sidewalls make the parshall flume one of the easiest flumes to use accurately. Kashibai navale college of engineering, pune, maharashtra, india. Venturi flume experiment free download as word doc. Stop logs are simple rectangular shapes which slot one after the other into the discharge end of the channel. The flumes are designed based on principles of critical flow in open channels. Venturi flume are described by characteristics such as material, connections and throat width.
Poster with ideas for teaching students about fluid properties and particle transport acrobat pdf 1. It was thought that the flume might be converted into a selfcontained measuring device by placing a restricted section in the flume, which would cause a loss of. Differential pressure type flow meters head flow metersmeasure flow rate by introducing a constriction in. Venturi flume experiment fluid mechanics flow measurement. The experimental flume hm 160 has a closed water circuit. The flumes are manufactured in fibre glass, pvc or stainless steel.
Both open channel and full pipe flow rates during surcharged manhole. Get access to read online pdf ebook library lab manual of venturi flume experiment download lab manual of venturi flume experiment. This causes drop in hydraulic grade line which creates critical depth. The headdischarge relationship of such measurement devices can be determined following the critical flow theory, but this approach is only valid if the length of the throat is sufficiently long. A flume is a humanmade channel for water in the form of an open declined gravity chute whose walls are raised above the surrounding terrain, in contrast to a trench or ditch. Jan 14, 20 video of an experimental river flume in the basement of padnos hall of science.
A particularly attractive version of such a device is a standingwaveflume, as this. A pair of venturi sides to fit into the channel allowing demonstrations of flow measurement techniques used in rivers and waterways. The design and calibration of three simple flumes for flow measurements in open channels are discussed. When flow out of the parshall flume is returning to a channel or pipe, the epa recommends that the channel be straight and unobstructed for 520 throat widths although flow spilling freely off the end of the flume can eliminate this requirement. In open channel hydraulics, weirs are commonly used to either regulate or to measure the volumetric flow rate, they are of particular use in large scale situations such as irrigation schemes, canals and rivers. Venturi meter and orifice meter are the commonly used flow meters for measuring massvolumetric flow rate or velocity of the flowing fluid.
Pdf venturi flume is a very popular flow measuring device. Fm 308 flow measurement by venturi and orifice meter. The flume was again brought to the attention of poten tial users by a may 1954 unpublished paper entitled portable venturi flume for measuring small flows, by george h. Flume experiments on the transport of a coarse sand. Broad crested weirventuriflume almost same procedure. Common types are the sharp crested weir including vnotch weir, rectangular weir, and cipolletti weir, the broad crested weir, the parshall flume and venturi flume. This tutorial is a continuation of tutorial 1 and 2 and these should be studied first.
Venturi meters are used for measuring the flowrate of both compressible and incompressible fluids in a pipeline. Mar 01, 2018 structural analysis vol 2 by bhavikatti pdf 28 download. Williams abstract a newly constructed 52foot laboratory flume was used to study sediment transport in a series of 37 runs with a coarse 1. Jun 12, 2015 this present study focuses on determining the aeration efficiency of a small 3 inch parshall flume and modified venturi flumes from this parshall flume, in particular the effect of varying throat width, throat length and sill height. More specifically, this simple venturi meter, constructed from materials available at a local hardwareauto parts store, was characterized by determining the venturi coefficient and the permanent pressure loss. Venturi flume report abstract the evolving circumstances under which irrigation districts operate include growing demands for more accurate knowledge and accountability of flow throughout the conveyance network, along with increased needs for timely awareness when unexpected flow conditions are present. The side walls of the experimental section are made of tempered glass, which allows excellent observation of the experiments. Pdf hydraulic investigation of venturi flumes researchgate. The crosssection of the experimental section is 86x300mm. A venturi flume is a criticalflow open flume with a constricted flow which causes a drop in the hydraulic grade line, creating a critical depth it is used in flow measurement of very large flow rates, usually given in millions of cubic units. Rectangular venturi flume the original idea was to invent a device which would replace the ordi nary rating flume, such as is used in irrigation canals. Hydraulics, venturi flume questions physics forums. The dimensions for many parshall flume sizes were developed by dr.
The flow is determined using a sudden enlargement, venturi meter, orifice plate, elbow and a rotameter. The flow of a fluid has to conform with a number of scientific principles in particular the conservation of mass and the conservation of energy. To find the coefficient of discharge for orifice meter. Full details of methods, procedures and apparatus used for laboratory experiments. Ppt venturiflume powerpoint presentation free to view. Advantages of venturi flume,disadvantages of venturi flume. The first one requires and the second approach does not require crossing of critical depth by the liquid free surface somewhere in a flume. The major objective of this experiment was to construct, test and model a simple, inexpensive venturi meter. Lab manual of venturi flume proton service manual download ncert lab manual of science for class 10. Energy losses through venturi, orifice, and rotameter flowmeters. The pressure along the meter is obtained using the 11 pressure taps at the locations shown on the diagram. Measuring open channel flow rates with a weir or a flume. It was originally described as venturi flume in a march 10, 1932 memorandum from the office of the ground water branch, usgs. A particularly attractive version of such a device is a standingwaveflume, as this enables determination of liquid discharge by onepoint.
A control flume that comprises a short constricted section followed by one expanding to normal width. Energy losses through venturi, orifice, and rotameter. Derive equations for the flow rate through a venturi flume. Pdf model based flow measurement using venturi flumes for. Two different approaches to flow rate measurements by flumes have been compared. Open channel flow rate measurement is usually done by measuring a change in water depth. File type pdf lab manual of venturi flume experiment lab manual of venturi flume experiment if you ally infatuation such a referred lab manual of venturi flume experiment book that will provide you worth, acquire the definitely best seller from us currently from several preferred authors. A schematic of the venturi meter is shown on the diagram at the end of the procedure. To investigate the flow rate using particular flow measuring apparatus.
Experimental and cfd analysis of flow through venturimeter to determine the coefficient of discharge nikhil tamhankar department of mechanical engineering smt. Inducont mjk flow measurement prefabricated flumes. The water flow rate can be adjusted using the valves on the hydraulics bench. Oct 23, 2015 homework statement a venturi flume is formed in a horizontal rectangular channel 1. A qh related ultrasonic volume measurement type nivumaster has been installed. This present study focuses on determining the aeration efficiency of a small 3 inch parshall flume and modified venturi flumes from this parshall flume, in particular the effect of varying throat width, throat length and sill height.
Venturi flumes are used in openchannels to determine the discharge by the measurement of a water level. Venturi flume is a very popular flow measuring device. Such obstructions make the use of the ordinary rating flume very troublesome, if not quite. The pressure drop associated with each meter is measured directly from the manometers. Hd 1 r1 civil engineering lab iigroup 3 hydraulics 1 hd 1. Download file pdf lab manual of venturi flume experiment the venturi flume hm162. Video of an experimental river flume in the basement of padnos hall of science. Venturi flumes are recommended for liquid flow measurement within open channels, particularly where suspended solids material is being transported, and are almost universally used in measuring the inflow to sewage trea. Experimental verification of the simulation results show a promising behavior of the model based measurement of the return fluid flow.
Venturi meter a venturi meter is a tube with a constricted throat that increases velocity and decreases pressure see figure 1. The venturi flume is held in place by a simple stretcher screw. It is critical flow open flume with constricted flow. The venturi effect is achieved by way of a horizontal constriction of the. The experimental section is 2,5m long and can be increased to 5m with the extension element hm 160. In order to maintain the measuring uncertainty as low as possible, an ultrasonic sensor with a very low dead zone type pm3, dead zone 0. Flow measurement prefabricated flumes for measurement of flow in open systems mjk supplies prefabricated flumes. Venturi flume is used for very large flow rate measurements, usually in units of. To get more information please expand the product block by pressing on image or product title. Early in 1915, tests were conducted at the fort collins hydraulic laboratory of the colorado agricultural experiment station on a watermeasuring device having a.
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