Compute fluid velocity, pressure drop, Reynolds number, and friction loss in pipes using industry-standard Darcy-Weisbach or Hazen-Williams equations.
Darcy-Weisbach is more accurate and works for all fluids. Hazen-Williams is an empirical formula simpler to use but valid ONLY for water at normal temperatures.
It predicts flow patterns. Re < 2100 is Laminar (smooth). Re > 4000 is Turbulent (chaotic). This determines which friction factor formulas apply.
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