Question

An orifice meter, having an orifice of diameter 'd' is fitted in a pipe of diameter D. For this orifice meter, what is the coefficient of discharge Cd?

• A. A function of Reynolds number only
• B. A function of d/D only
• C. A function of d/D and Reynolds number
• D. Independent of d/D and Reynolds number

Answer 1

Answer:

C. A function of d/D and Reynolds number

Coefficient of Discharge is defined as the ratio of actual flow to ideal flow and is always less than one, indicating the losses in flow. The coefficient of discharge Cd for an orifice meter depends on both the diameter ratio d / D and the Reynolds number of the flow.