What is coefficient of discharge?

The coefficient of discharge is a dimensionless factor that is used to relate the actual flow rate of a fluid through a given opening to the theoretical flow rate that would be expected based on the size and shape of the opening. It is typically denoted by the symbol Cd.

The coefficient of discharge accounts for the influence of factors such as the geometry of the opening, the viscosity of the fluid, and any obstructions or imperfections that may affect the flow. It is used in various engineering applications, such as when calculating the flow rate of fluids through pipes, nozzles, or orifices.

The coefficient of discharge is typically determined experimentally through calibration tests. It is important to note that the coefficient of discharge may vary depending on the specific conditions of the flow, such as the Reynolds number, the fluid temperature, and the pressure.

In general, a higher coefficient of discharge indicates a more efficient flow through the opening, while a lower coefficient indicates a less efficient flow. It is important to consider the coefficient of discharge when designing systems that involve fluid flow to ensure accurate and reliable performance.