Home laboratory experiment on venturi meter and orifice meter. Venturi tubes, orifice plates, and flow nozzles duration. A venturi meter constricts the flow of fluid and the pressure differential is measure using pressure sensors before and within the constriction. The concentric orifice plate is used to measure flow rates of pure fluids and has a wide applicability as it has been standardized. While working with the same basic principles as venturi and orifice type dp meters, cone meters dont require the same upstream and downstream piping. To determine the coefficient of discharge of the orifice meter 1. A nozzle, venturi or thin sharp edged orifice can be used as the flow restriction. Laboratory experiment on venturi meter and orifice meter uk essays. In this investigation explicit equations for the discharge of venturimeter and orificemeter have been obtained in terms of. Fm 308 flow measurement by venturi and orifice meter objectives. Orifice and venturi meter calculations with excel spreadsheet formulas. Advantages and disadvantages of orifice and venturi meter. Venturi meter and orifice plate effects are two main and very important phenomenas in fuild mechanics sub field of mechanical engineering. To determine the coefficient of discharge of an orifice meter.
There is a pressure tap upstream from the orifice plate and another just downstream. Yamamoto department of chemical engineering, college of engineering and architecture, cebu institute of technology university n. Bsen 3310 lab 2calibration of orifice flow meter and. Venturi meter and orifice meter free download as pdf file. Venturi meter presents a costlier method to measure the rate flow of fluid through the pipe. Orifice meter presents a cheaper method to measure the rate of flow through the pipe. The coefficient of discharge c d for a venturi meter is in the region of 0. Study for free with our range of university lectures. Orifice 1 to determine the coefficient cd of an orifice meter by comparing the. Water from the hydraulic bench enters the equipment through a venturi meter. Orifice plate is similar in the sense that it make use of a plate with a small hole in between to place restriction in the passage of the fluid.
Venturi meter is a device or component which is used for measuring the rate of flow of liquid through pipes. It is a cheaper device as compared to venturimeter. It consists of flat circular plate which has a circular hole, in concentric with the pipe. Fluid flow causes the float to rise in the tube as the. The principle of the orifice meter is identical with that of the venturi meter. Venturi meter and orifice meter are the commonly used flow meters for measuring massvolumetric flow rate or velocity of the flowing fluid.
Energy losses through venturi, orifice, and rotameter. Home free essays laboratory experiment on venturi meter and orifice meter. However, the same principle can be exploited with only minimal pressure loss with the use of a venturi meter. A venturi meter is more efficient, but usually more expensive and less accurate. To find the coefficient of discharge for venturi meter. Flow meter pressure drop orifice plate, nozzle and venturi tube. An orifice meter is basically a type of flow meter used to measure the rate of flow of liquid or gas, especially steam, using the differential pressure measurement principle. Orifice plates and venturi tubes michael readerharris. Difference between venturi and orifice compare the. Energy losses are less in a venturi meter whereas energy losses. Excel spreadsheet formulas can be conveniently used to make calculation for differential pressure flow meters, like an orifice flow meter, a venturi meter, or a flow nozzle meter. Flow measurement with orifice,venturi and rotameter engi.
A venturi is a convergingdiverging nozzle of circular crosssection. What is the difference between venturimeter and orificemeter. Materials and methods a manometer figure 1, an orifice flow meter figure 2, and a venturi flow meter figure 3 were used to measure the flow rate and pressure change of the water flowing through the pipes. Also, since rule citation references are not part of the questions themselves and are included only to assist when looking up the applicable section of the rules, errors in the reference identifiers are not considered adequate reason for. Conclusion in this experiment cd, the coefficient of discharge, was calculated for the venturi meter. In this post the effect of venturi meter and orifice plate on the fluid flow will be disciussed and complete work will be presented in the form of report. The principle of venturimeter is that when a fluid flows through the venturimeter, it accelerates in the convergent section and decelerates in the divergent section, resulting in a drop in the static pressure followed by a. The manometer tubes 1 and 2 corresponded to the venturi meter. Laboratory experiment on venturi meter and orifice meter. An orifice plate is a device used for measuring flow rate, for reducing pressure or for restricting.
A spreadsheet to assist with orifice venturi flow nozzle meter calculations and iso 5167 calculation of an orifice coefficient is also provided. When comparing the reynolds number to cd for the venturi meter the graph remained relatively linear until there was a drastic. Daniel measurement and control white papersfundamentals of orifice meter measurement page 1. It is mainly used for robust applications as it is known for its durability and is very economical. Cd for the venturi meter decreased as the flow rate decreased with each trial. If you still have doubts feel free to mention in the comment section or you can also. This is evident in a turbine flow meter, where the impact force of the water on the blades sets the rotor in motion. In this case, the flowing stream has a free or unconstrained.
A picture showing the different flow meters is in figure 1. By employing the continuity equation and bernoullis principle, the volumetric flow rate through the orifice meter can be calculated as described previously for venturi meter. The apparatus for this experiment contained an orifice meter and plate, a venturi flow meter, a rotameter, a weighing bucket with a scale, a stopwatch, and manometers that corresponded to the different meters used. Bengtson, pes course on orifice and venturi pipe flow meters for liquid and gas flow. Pdf discharge equations for venturimeter and orificemeter. To find the coefficient of discharge for orifice meter. Conclusion in this experiment cd the coefficient of. The major difference between venturi and orifice meter is the time taken for water collection in measuring tank size of tank minimum 60 ltrs. The following sections in this article present three excel templates for such calculations. Energy losses through venturi, orifice, and rotameter flowmeters. The venturi meter is invented by an american engineer clemans herchel 18411932 and named him after italian giovanni venturi 18421932. Definition, parts, working, derivation, applications. The orifice meter consists of a flat orifice plate with a circular hole drilled in it.
Flow measurement is the quantification of bulk fluid movement. Cebu city, 6000 philippines this experiment aims to be calibrate both the venture apparatus and the orifice apparatus. Use excel formulas for orifice, venturi meter and ideal. There is a correction in orifice diagram the orifice plate is in between and the u tube attached ends are on right side and left side if there is any dout you. The standard deviation, for cd was also calculated to be. Pdf using experimental curves for the discharge coefficients of venturimeter or. If you find this website valuable and appreciate it is open and free for everybody please. There are many different meters used to measure fluid flow. Ansery orifice meter it may be installed in pipeline with a minimum of trouble and expense orifice meter orifice meter. Pdf flow through a venturi meter orifice rotameter. This system occupies more space as compared to the orifice meter. In the previous programme we saw that the relationship between the pressure p, the velocity u and the elevation z of a flowing fluid is given by bernoullis equation. Venturi meter is a device or component which is used for measuring the rate of.
The eccentric and segmental orifice plates are used to measure flow rates of fluids containing suspended materials such as solids, oil mixed with water and wet steam. One of the disadvantages of orifice meters is the large irreversible pressure loss across the orifice, which results in substantial pumping costs in case of large diameter pipes. This is evident in a turbine flow meter, where the impact. Objective the main objectives of this experiment is to obtain the coefficient of discharge from experimental data by utilizing venturi meter and, also the relationship between reynolds number and the coefficient of discharge.
For those who want to use an orifice plate or a venturi tube the standard iso 5167 and its associated technical reports give the instructions required. Venturi meter and orifice meter dynamics mechanics civil. To find the coefficient of discharge of an orifice meter. Orifice and venturi meter works under the same principle, both meters creates a restriction in the flow channel and the pressure difference across the restriction is measured, which is proportional to the rate of discharge of flowing fluid through the pipeline. As we learned in the impact jet lab, the speed of a moving jet of water is proportional to the waters velocity. Calibration of an orifice plate flowmeter mechanical engineering department king saud university riyadh submitted by. Calibration of venturi and orifice meters hirizza junko m. Introduction there are many different meters used to measure fluid flow.
The turndown ratio tr for an orifice meter with maximum flow of 12 kgs and a minimum flow of 3 kgs can be calculated as. In this meter the fluid is accelerated by its passage through a converging cone of angle 15. Definition, parts, working principle, derivation, applications with pdf. Flow measurement with orifice,venturi and rotameter. A free powerpoint ppt presentation displayed as a flash slide show on id. Fm 308 flow measurement by venturi and orifice meter. The venturi meter has a converging conical inlet, a cylindrical throat and a diverging.
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