Match the following operating principles to the correct flow meter: 1.Use a free

Question

Match the following operating principles to the correct flow meter:

1.Use a free-spinning turbine wheel to measure fluid velocity, much like a miniature windmill installed in the flow stream.

2.Involves placing a bluff body (called a shedder bar) in the path of the fluid. As the fluid passes this bar, disturbances in the flow called vortices are created. The vortices trail behind the cylinder, alternatively from each side of the bluff body. The frequency at which these vortices alternate sides is essentially proportional to the flow rate of the fluid. Inside, atop, or downstream of the shedder bar is a sensor for measuring the frequency of the vortex shedding. This sensor is often a piezoelectric crystal, which produces a small, but measurable, voltage pulse every time a vortex is created. Since the frequency of such a voltage pulse is also proportional to the fluid velocity, a volumetric flow rate is calculated using the cross sectional area of the flow meter.

3.The tube on which the fluid flows is vibrated and the amount of twist is proportional to the mass flow rate of fluid passing through the tube(s). Sensors and a mass flowmeter transmitter are used to measure the twist and generate a linear flow signal.

4.Uses a magnetic field applied to the metering tube, which results in a potential difference proportional to the flow velocity perpendicular to the flux lines. The potential difference is sensed by electrodes aligned perpendicular to the flow and the applied magnetic field. The magnetic flow meter requires a conducting fluid and a nonconducting pipe liner.

5.Accumulate a fixed volume of fluid and then count the number of times the volume is filled to measure flow.

6.Measure the difference of the transit time of ultrasonic pulses propagating in and against the direction of flow. This time difference is a measure for the average velocity of the fluid along the path of the ultrasonic beam. By using the absolute transit times both the averaged fluid velocity and the speed of sound can be calculated

Explanation / Answer

The flow meter types of the given principles are:

1.It is a Swirl meter of Velocity flowmeter.

2. It is a Votex meter of Velocity flowmeter.

3. It is a Coriolis meter of Mass flowmeter of velocity flowmeter.

4. It is an Electromagnetic meter of Velocity flowmeter.

5. It is Rotary Vane meter of Positive displacement flowmeter.

6. Ultrasonic (doppler, transit time) flowmeter

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