However, the same principle can be exploited with only minimal pressure loss with the use of a venturi meter. A picture showing the different flow meters is in figure 1. Yamamoto department of chemical engineering, college of engineering and architecture, cebu institute of technology university n. Venturi meter is a device or component which is used for measuring the rate of flow of liquid through pipes.
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. 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. Home free essays laboratory experiment on venturi meter and orifice meter. 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. Bsen 3310 lab 2calibration of orifice flow meter and. If you find this website valuable and appreciate it is open and free for everybody please. It is a cheaper device as compared to venturimeter.
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. Flow measurement is the quantification of bulk fluid movement. Venturi tubes, orifice plates, and flow nozzles duration. There is a pressure tap upstream from the orifice plate and another just downstream. A venturi meter constricts the flow of fluid and the pressure differential is measure using pressure sensors before and within the constriction. Conclusion in this experiment cd the coefficient of.
Orifice and venturi meter calculations with excel spreadsheet formulas. A spreadsheet to assist with orifice venturi flow nozzle meter calculations and iso 5167 calculation of an orifice coefficient is also provided. While working with the same basic principles as venturi and orifice type dp meters, cone meters dont require the same upstream and downstream piping. A venturi meter is more efficient, but usually more expensive and less accurate. 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. 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. Venturi meter presents a costlier method to measure the rate flow of fluid through the pipe. The orifice meter consists of a flat orifice plate with a circular hole drilled in it. As we learned in the impact jet lab, the speed of a moving jet of water is proportional to the waters velocity. This is evident in a turbine flow meter, where the impact force of the water on the blades sets the rotor in motion. There are many different meters used to measure fluid flow.
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. 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. Venturi meter and orifice plate effects are two main and very important phenomenas in fuild mechanics sub field of mechanical engineering. Bengtson, pes course on orifice and venturi pipe flow meters for liquid and gas flow. Use excel formulas for orifice, venturi meter and ideal.
To find the coefficient of discharge of an orifice meter. Ansery orifice meter it may be installed in pipeline with a minimum of trouble and expense orifice meter orifice meter. 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. Home laboratory experiment on venturi meter and orifice meter. It consists of flat circular plate which has a circular hole, in concentric with the pipe. The coefficient of discharge c d for a venturi meter is in the region of 0. The principle of the orifice meter is identical with that of the venturi meter.
This system occupies more space as compared to the orifice meter. 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. What is the difference between venturimeter and orificemeter. Fluid flow causes the float to rise in the tube as the. The venturi meter is invented by an american engineer clemans herchel 18411932 and named him after italian giovanni venturi 18421932. 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. When comparing the reynolds number to cd for the venturi meter the graph remained relatively linear until there was a drastic. Pdf discharge equations for venturimeter and orificemeter. In this meter the fluid is accelerated by its passage through a converging cone of angle 15. Calibration of venturi and orifice meters hirizza junko m.
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. 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. Water from the hydraulic bench enters the equipment through a venturi meter. Energy losses through venturi, orifice, and rotameter. Definition, parts, working principle, derivation, applications with pdf. A nozzle, venturi or thin sharp edged orifice can be used as the flow restriction. An orifice plate is a device used for measuring flow rate, for reducing pressure or for restricting. Cd for the venturi meter decreased as the flow rate decreased with each trial. Venturi meter and orifice meter dynamics mechanics civil. To determine the coefficient of discharge of an orifice meter. The manometer tubes 1 and 2 corresponded to the venturi meter. Daniel measurement and control white papersfundamentals of orifice meter measurement page 1. To find the coefficient of discharge for orifice meter. The concentric orifice plate is used to measure flow rates of pure fluids and has a wide applicability as it has been standardized.
Advantages and disadvantages of orifice and venturi meter. 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. Energy losses are less in a venturi meter whereas energy losses. The following sections in this article present three excel templates for such calculations. Definition, parts, working, derivation, applications. Fm 308 flow measurement by venturi and orifice meter. To find the coefficient of discharge for venturi meter. Cebu city, 6000 philippines this experiment aims to be calibrate both the venture apparatus and the orifice apparatus. Venturi meter is a device or component which is used for measuring the rate of. Calibration of an orifice plate flowmeter mechanical engineering department king saud university riyadh submitted by.
Flow measurement with orifice,venturi and rotameter engi. 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. Pdf flow through a venturi meter orifice rotameter. A venturi is a convergingdiverging nozzle of circular crosssection. Pdf flow through a venturi meter orifice rotameter emmanuel.
The major difference between venturi and orifice meter is the time taken for water collection in measuring tank size of tank minimum 60 ltrs. Flow measurement with orifice,venturi and rotameter. Energy losses through venturi, orifice, and rotameter flowmeters. Venturi meter and orifice meter free download as pdf file. In this case, the flowing stream has a free or unconstrained. Pdf using experimental curves for the discharge coefficients of venturimeter or. Fm 308 flow measurement by venturi and orifice meter objectives. Conclusion in this experiment cd, the coefficient of discharge, was calculated for the venturi meter. This book gives the background to differentialpressure flow measurement and goes through the requirements explaining the reason for them. If you still have doubts feel free to mention in the comment section or you can also. Introduction there are many different meters used to measure fluid flow. This is evident in a turbine flow meter, where the impact. Venturi meter and orifice meter are the commonly used flow meters for measuring massvolumetric flow rate or velocity of the flowing fluid.
In this investigation explicit equations for the discharge of venturimeter and orificemeter have been obtained in terms of. A free powerpoint ppt presentation displayed as a flash slide show on id. It is mainly used for robust applications as it is known for its durability and is very economical. Study for free with our range of university lectures. Laboratory experiment on venturi meter and orifice 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. Difference between venturi and orifice compare the. 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 standard deviation, for cd was also calculated to be. Orifice meter presents a cheaper method to measure the rate of flow through the pipe.
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