The Colebrook equation is used to calculate the Darcy friction factor for fluid flow in a pipe. The Darcy friction factor is a dimensionless quantity that measures the resistance to flow caused by the pipe wall roughness and the fluid viscosity. It’s an important parameter for designing and analyzing pipe systems, such as water supply, oil and gas transportation, or HVAC.
The Colebrook equation is a complex equation that involves iterative calculations because it’s implicit in terms of the friction factor. That means you can’t solve for the friction factor directly, but you have to use a trial-and-error method until you find a value that satisfies the equation. While you can use Excel to perform these calculations, it may require some effort to set up.
Here’s how you might implement the Colebrook equation in Excel:
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