EXPERIMENTAL CLASS 3. FLOW MEASUREMENT2015.04.03

EXPERIMENT 3. FLOW MEASUREMENT

Local Flow measurement Pitot Tube

Using Differential Pressure

This equation provides the relation between pressure and velocity.

𝑝𝐴

𝜌=𝑣2

2+𝑝𝐵

𝜌

𝑃 𝐴>𝑃 𝐵

𝑣=√¿¿

EXPERIMENT 3. FLOW MEASUREMENT

Average(Global) Flow measurement Pressure Difference

Orifice, Venturi, Nozzle, Elbow tube, etc.

Linear Flow Meter

Turbine Meter, Vortex Meter, Ultrasonic Flow Meter, etc.

Force Balance

Rotameter

EXPERIMENT 3. FLOW MEASUREMENT

Using Pressure Difference : Orifice Plate & Venturi Using pressure difference between the front and the back of the devices

Using Linear Velocity : Ultrasonic Flowmeter It detects the flow rate using Ultrasonic wave,

In the secondary system of PWRs, the other flow sensors suffer fouling problem erroneously indicating high feed water flow.

It can cost a plant nearly 3 percent of power output. Because of this problem, many plants have installed ultrasonic flow sensors.

For this 3 percent gain in plant power output, plants must pay about $2 million (in 2006) to implement an ultrasonic flow sensor.

EXPERIMENT 3. FLOW MEASUREMENT

Using Linear Velocity : Vortex meter If an objective, such as a cylinder, is put in

flowing fluid, then vortex happens.

This vortex generates signal and the vortex flow meter detect this vortex and the flow rate can be measured

EXPERIMENT 3. FLOW MEASUREMENT

EXPERIMENT 3. FLOW MEASUREMENT

Using Force Balance : Rotameter Gravity – Buoyancy= Pressure drop due to flow

Since gravity is fixed and buoyancy force is constant for the given flow rate, the pressure drop due to flow rate determines the location of the float

EXPERIMENT 3. FLOW MEASUREMENT