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Derivation of Darcy Weisbach Equation

The Darcy-Weisbach Equation is an empirical formula used to calculate the pressure drop of a fluid flowing through a pipe or other conduit. It relates the pressure drop or head loss of a fluid to the average velocity, diameter, roughness, and length of the pipe or conduit. The equation is expressed as: h = f (L/D) (V^2/2g) where: h is the head loss or pressure drop f is the Darcy-Weisbach friction factor L is the length of the pipe or conduit D is the diameter of the pipe or conduit V is the average velocity of the fluid g is the acceleration due to gravity The Darcy-Weisbach friction factor is a dimensionless quantity that depends on the Reynolds number, which is a ratio of inertial forces to viscous forces in the fluid. The friction factor can be determined by using experimental data, correlations, or computational fluid dynamics simulations. The Darcy-Weisbach Equation is commonly used in engineering and fluid mechanics to design and analyze piping systems and other hydraulic structures.