Table of Contents
- 1 Why an orifice meter is called as variable head meter?
- 2 Why Venturi meter is a variable area meter?
- 3 What is the difference between Venturi meter and orifice meter?
- 4 Which of the following is also known as variable heat meter?
- 5 Which meter is also known as insertion meter?
- 6 Which of the following is a variable area meter * Venturi meter Rota meter orifice meter Pitot tube?
- 7 How Venturimeter orifice meter and pitot tubes are different from each other?
- 8 How does variable area flow meter work?
- 9 What is the difference between orifice meter and venturi meter?
- 10 Which plate acts as a restriction in a venturi meter?
- 11 What is the coefficient of discharge in Venturi and orifice?
Why an orifice meter is called as variable head meter?
Answer Expert Verified. A variable area meter measures the flow of fluid by permitting the cross-sectional area of the meter to change in accordance to the flow of the liquid. A variable head meter has a constant area of orifice or constriction. The pressure drop is dependent on the flow rate.
Why Venturi meter is a variable area meter?
An variable area flow meter is one where the fluid must pass through a restriction whose area increases with flow rate. This stands in contrast to flow meters such as orifice plates and venturi tubes where the cross-sectional area of the flow element remains fixed.
Which of the following is also called a variable area meter?
4.3. The variable area meter, also known as a rotameter, a vertically tapered tube, with the small diameter facing down. It’s normally made of glass, with a float inside that is pushed up by the force from the upward fluid flow and pulled down by gravitational force.
What is the difference between Venturi meter and orifice meter?
The difference between venturi meter and orifice meter are: The pressure loss in venturi meter is 10\% while in the orifice meter the pressure loss is 50-60\%. The coefficient of discharge in the venturi meter is 0.98 while in orifice meter it is 0.6.
Which of the following is also known as variable heat meter?
Variable area flowmeters are also called “rotameters”. They are simple flowmeters but effective for measuring the flow of liquids, gases or steam.
What is variable head flowmeter?
Variable area flowmeters are very simple yet versatile flow measurement devices for use on all types of liquids, gases and steam. They operate on the variable area principle, whereby a flowing fluid changes the position of a float, piston, or vane to open a larger area for the passage of the fluid.
Which meter is also known as insertion meter?
Insertion meter is also called as * Orifice meter.
Which of the following is a variable area meter * Venturi meter Rota meter orifice meter Pitot tube?
Explanation: Rotameter: Rotameter works as a constant pressure drop variable area meter.
Why Venturimeter VM coefficient is more than orifice meter OM coefficient?
In Venturi meter losses are less so coefficient of discharge is higher whereas in orifice meter due to no convergent and divergent cones there are more losses and hence its coefficient of discharge is less.In venturi meter losses are low due to steamline shape of the diffuser and the pressure gradient is not abrupt as …
How Venturimeter orifice meter and pitot tubes are different from each other?
The orifice meter is a device (cheaper than venturimeter) used for measuring the discharge of the liquid flowing through a pipe. It works on the same principle as that of venturimeter. The pitot tube is a small open tube bent at right angle. It is used to measure the velocity of flow at the required point in a pipe.
How does variable area flow meter work?
Variable area flow meters are simple and versatile devices that operate at a relatively constant pressure drop and measure the flow of liquids, gases, and steam. The position of their float, piston or vane is changed as the increasing flow rate opens a larger flow area to pass the flowing fluid.
What is also known as insertion meter and insertion tube?
[in′sər·shən ‚mēd·ər] (engineering) A type of flowmeter which measures the rotation rate of a small propeller or turbine rotor mounted at right angles to the end of a support rod and inserted into the flowing stream or closed pipe.
What is the difference between orifice meter and venturi 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.
Which plate acts as a restriction in a venturi meter?
This plate acts as a restriction. Pressure taps are provided before and after the orifice plate in order to measure the drop in pressure. In the Venturi meter; when the fluid reaches the converging part then according to continuity equation, when the cross sectional area decreases then the velocity of the flowing fluid increases.
What is the difference between orifice plate and Venturi plate?
Orifice plates are easy to make and are very cheap in comparison. The head lost in orifice meters is many times greater than with Venturi meters. Orifice plates are more flexible as installing a new orifice plate to a wider or narrower opening is easier and cheaper than arranging Venturi plates.
What is the coefficient of discharge in Venturi and orifice?
In Venturi meter; the value of coefficient of discharge can be up to 0.98, it is relatively high. In Orifice meter; the value of coefficient of discharge is in the neighborhood of 0.6, it is relatively low. The Turn Down Ratio Turn Down ratio is the ratio of the maximum capacity to minimum capacity.