swamee-jain equation formula |
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| f=0.25(log(ϵ3.7⋅d+5.74Re0.9))2 | ||
| Symbol | English | Metric |
| f = Friction Factor | dimensionless | dimensionless |
| ϵ (Greek symbol epsilon) = Absolute Roughness | in | mm |
| d = Inside Diameter of Pipe | in | mm |
| Re = Reynolds Number | dimensionless | dimensionless |
Swamee-Jain equation, also called Jain equation or the Darcy-Weisbach equation, is used in fluid mechanics to calculate the pressure drop or head loss of a fluid flowing through a pipe. It's an empirical equation derived from experimental data and is widely used in engineering and fluid dynamics for estimating pressure losses due to friction in pipes.
