Segment V8.6: Rotameter

(Related to Textbook Section 8.6.1 - Pipe Flowrate Meters)

It is often necessary to determine the volumetic flowrate of a fluid in a pipe. A rotameter can be used for such purposes.

The main elements of a rotameter are a tapered tube through which the fluid flows and the float within the tube. The equilibrium height of the float within the tube is a function of the flowrate and represents a balance between buoyant, weight, and drag forces on the float. As the flowrate in the pipe increases or decreases, the water bubbles higher or lower from the exit and the float in the rotameter rises or falls.