3.3 MEASUREMENT OF VELOCITY AND DISCHARGE.

Introduction

This course is about measurement of the flow rate of a fluid flowing under pressure in a closed conduit. The closed conduit is often circular, but also may be square or rectangular (such as a heating duct) or any other shape.  The other major category of flow is open channel flow, which is the flow of a liquid with a free surface open to atmospheric pressure.  Measurement of the flow rate of a fluid flowing under pressure is carried out for a variety of purposes, such as billing for water supply to homes or businesses, or for monitoring or process control of a wide variety of industrial processes which involve flowing fluids. Several categories of pipe flow measurement devices will be described and discussed including some associated calculations.