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.
swamee-jain equation formula |
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| \( f \;=\; \dfrac{ 0.25 }{ \left( log \left( \dfrac{\epsilon }{ 3.7\cdot d } + \dfrac{ 5.74 }{ Re^{0.9} } \right) \right)^2 }\) | ||
| Symbol | English | Metric |
| \( f \) = Friction Factor | \( dimensionless \) | \( dimensionless \) |
| \( \epsilon \) (Greek symbol epsilon) = Absolute Roughness | \( in \) | \( mm \) |
| \( d \) = Inside Diameter of Pipe | \( in \) | \( mm \) |
| \( Re \) = Reynolds Number | \( dimensionless \) | \( dimensionless \) |
