What is difference between orifice meter and rotameter?

The orifice meter, Venturi tube and flow nozzle work on the principle of constant area variable pressure drop. Here the area of obstruction is constant, and the pressure drop changes with flow rate. On the other hand Rotameter works as a constant pressure drop variable area meter.

What are the differences between rotameter Venturi and orifice?

The major difference between venturimeter and orificemeter is the Venturimeter is not flexible with the flow rate range while the orifice plate in the orifice meter can easily change for different flow rates.

What is rotameter and orifice meter used for?

An orifice meter is a piece of equipment used to measure the flow rate of a gas or a fluid. It mainly consists of an orifice plate, an orifice plate housing, and a meter tube.

What is difference between orifice and orifice meter?

In the matter of design, orifice for flow meter always designed to flow in a subsonic velocity in order to ensure the accuracy of flow measurement, while the restriction orifice always designed to flow in the sonic velocity to ensure choked flow. Indeed RO main function is to limit the flow (flow-limiting).

What is orifice meter used for?

The simplest and most common device for measuring flow rate in a pipe is an orifice meter. An orifice meter is a device with a hole in it, which measures how fast a fluid is flowing, by recording the pressure decrease across the hole.

Flow Measurement Devices (Venturimeter, Rotameter

What is rotameter principle?

The operation of a rotameter is based on the variable area principle. That is, the flow of a liquid raises the float inside a tapered tube, increasing the area through which the liquid can pass. The larger the flow, the higher the float will be raised.

What is the difference between Venturimeter and nozzle meter?

Venturi Meters are Measurement Devices. Their primary objective is to measure flow volumes by measuring Pressure Differences in a specially defined profile. Nozzles are devices designed for the most efficient conversion of fluid Pressures to fluid Flow. The two are not interchangeable.

What is the difference between Venturimeter and pitot tube?

The reason is that there is no stagnation point in a venturi meter, whereas there is one in a pitot meter. Both rely upon Bernoulli's equation, but use different terms. The venturi meter takes advantage of a constriction to change the speed of fluid flow, thus changing the dynamic pressure.

Why is it called a rotameter?

The variable-area flowmeter is called a rotameter because the float spins, or rotates, as the flow passes it. The spinning float is a clear indication that fluid is flowing.

What are the advantages of rotameter?

Can a rotameter measure the flow of gasses?

Rotameter can measure gas. Rotameter is a variable area flow measuring instrument commonly used in industrial automation process control, which can be used to measure the flow of liquid, gas, and steam.

What are the advantages of orifice meter over venturimeter?

Advantages of Orifice meter:

The orifice meter can be easily maintained. Measures a wide range of flows. They have a simple construction. They have easily fitted between the flanges.

What is the difference between orifice and mouthpiece?

An orifice is an opening made in the side or bottom of tank, having a closed perimeter, through which the fluid may be discharged. A mouthpiece is short tube fitted to a same size circular opening provided in a tank so that fluid may be discharged through it.

Where is Venturi meter used?

Venturimeter is a type of flowmeter that works on the principle of Bernoulli's Equation. This device is widely used in the water, chemical, pharmaceutical, and oil & gas industries to measure the flow rates of fluids inside a pipe.

What is a rotameter also called?

A rotameter is a flow meter device that measures the volumetric flow rate of a gas or fluid. It consists of a tapered tube with a moving internal float. Sometimes known as mechanical flow meters, gravity flowmeters or variable area flowmeters.

What are the types of rotameter?

What is the constant of orifice meter?

Orifice coefficient, generally, is 0.61 in case of flange taps and vena-contracta taps for NRe< 30,000. In the process of calculating fluid velocity with a orifice meter, the velocity of approach is not included.

What is the difference between open channel flow and pipe flow?

Pipe flow Vs Open channel Flow

Open Channel Flow is a type of fluid flow in a conduit with a free surface open to the atmosphere. The pipe flow is a type of flow within a closed conduit. The maximum velocity occurs at the center of the pipe. HGL(Hydraulic Gradient Line ) coincides with the water surface line.

Which is more accurate Venturi or orifice?

Measurement of mass flow rate of fluid in fluid mechanics is by meters (venturimeter, orifice meter) connected at the entrance and at throat by recording pressure drop by manometer. Out of these, venturimeter is found to be the most accurate device for measurement of mass flow rate.

What is Vena Contracta in orifice meter?

Vena contracta is the point in a fluid stream where the diameter of the stream is the least, and fluid velocity is at its maximum, such as in the case of a stream issuing out of a nozzle (orifice).

What is a rotameter unit?

A rotameter, also called variable area flowmeter, is inherently a volumetric flow measurement device. The word origin is rota(tion) + messer/measure/meter. The scale can be in mass flow units if the volume flow rate is multiplied by a specified density, and in dimension units (mm) or percent.

Does pressure affect rotameter?

Rotameter accuracy is dependent on the accuracy of the pressure, temperature and flow control during calibration, and operation.

Where rotameter is used in industry?

Generally, safety-shielded glass tube rotameters are used widely in the industry to measure both liquids and gases. They provide flow capacities to about 60 GPM, and are manufactured with end fittings of metal or plastic to meet the chemical characteristics of the fluid being metered.

What are the types of orifice?

What is notch and weir?

A notch is an opening in the side of a measuring tank or reservoir extending above the free surface. A weir is a notch on a large scale, used, for example, to measure the flow of a river, and may be sharp edged or have a substantial breadth in the direction of flow.