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Darcy Friction Factor Equation:
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The Darcy Friction Factor is a dimensionless quantity used in fluid dynamics to characterize the frictional resistance in pipe flow. Its value depends on the flow's Reynolds number and the pipe's relative roughness. For laminar flow (ReD < 2300), it can be calculated using the simple formula f = 64/ReD.
The calculator uses the Darcy friction factor equation for laminar flow:
Where:
Explanation: This formula applies specifically to laminar flow conditions where ReD < 2300. For turbulent flow, more complex correlations are needed.
Details: Accurate friction factor calculation is crucial for determining pressure drops in piping systems, designing fluid transport systems, and optimizing energy consumption in pumping applications.
Tips: Enter the Reynolds Number (must be greater than 0). Note that this formula is valid only for laminar flow conditions (ReD < 2300).
Q1: When is this formula applicable?
A: This formula applies only to laminar flow conditions where the Reynolds number is less than 2300.
Q2: What about turbulent flow?
A: For turbulent flow (ReD > 4000), the friction factor depends on both Reynolds number and pipe roughness, typically calculated using the Colebrook-White equation or Moody chart.
Q3: What are typical friction factor values?
A: For laminar flow, friction factors typically range from about 0.01 to 0.1. For turbulent flow, values are generally between 0.008 and 0.08.
Q4: How does pipe roughness affect friction factor?
A: Pipe roughness significantly affects friction factor in turbulent flow but has no effect in laminar flow where the formula f = 64/ReD applies.
Q5: Can this calculator be used for non-circular pipes?
A: This specific formula is for circular pipes. For non-circular conduits, the hydraulic diameter should be used instead of pipe diameter.