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Darcy friction factor Formula

GoDarcy friction factor for Colburn analogy Formula

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Darcy Friction Factor is denoted by f. Its value depends on the flow's Reynolds number Re and on the pipe's relative roughness ε / D. It can be obtained from Moody's chart. Check FAQs

df = \frac{64}{Re D}

df - Darcy Friction Factor?Re_D - Reynolds Number Dia?

Darcy friction factor Example

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Here is how the Darcy friction factor equation looks like with Values.

Here is how the Darcy friction factor equation looks like with Units.

Here is how the Darcy friction factor equation looks like.

0.04 = \frac{64}{1600}

0.04 = \frac{64}{1600}

0.04 = \frac{64}{1600}

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Darcy friction factor Solution

Follow our step by step solution on how to calculate Darcy friction factor?

FIRST Step Consider the formula

df = \frac{64}{Re D}

Next Step Substitute values of Variables

∴

df = \frac{64}{1600}

Next Step Prepare to Evaluate

∴

df = \frac{64}{1600}

LAST Step Evaluate

∴

df = 0.04

Darcy friction factor Formula Elements

Variables

Darcy Friction Factor

Darcy Friction Factor is denoted by f. Its value depends on the flow's Reynolds number Re and on the pipe's relative roughness ε / D. It can be obtained from Moody's chart.

Symbol: df

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Darcy Friction Factor

Reynolds Number Dia

Reynolds Number Dia is the ratio of inertial forces to viscous forces.

Symbol: Re_D

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Reynolds Number Dia

Other Formulas to find Darcy Friction Factor

Go Darcy friction factor for Colburn analogy

df = 8 \cdot St \cdot {Pr}^{0.67}

Other formulas in Laminar Flow category

Go Reynolds Number given Darcy Friction Factor

Re = \frac{64}{df}

Go Hydrodynamic entry length

L = 0.04 \cdot D \cdot Re D

Go Diameter of hydrodynamic entry tube

D = \frac{L}{0.04 \cdot Re D}

Go Thermal entry length

L = 0.04 \cdot Re D \cdot D \cdot Pr

How to Evaluate Darcy friction factor?

Darcy friction factor evaluator uses Darcy Friction Factor = 64/Reynolds Number Dia to evaluate the Darcy Friction Factor, The Darcy friction factor formula is defined as a dimensionless quantity used for the description of frictional losses in pipe or duct as well as for open-channel flow. Darcy Friction Factor is denoted by df symbol.

How to evaluate Darcy friction factor using this online evaluator? To use this online evaluator for Darcy friction factor, enter Reynolds Number Dia (Re_D) and hit the calculate button.

FAQs on Darcy friction factor

What is the formula to find Darcy friction factor?

The formula of Darcy friction factor is expressed as Darcy Friction Factor = 64/Reynolds Number Dia. Here is an example- 0.04 = 64/1600.

How to calculate Darcy friction factor?

With Reynolds Number Dia (Re_D) we can find Darcy friction factor using the formula - Darcy Friction Factor = 64/Reynolds Number Dia.

What are the other ways to Calculate Darcy Friction Factor?

Here are the different ways to Calculate Darcy Friction Factor-

Darcy Friction Factor=8*Stanton Number*Prandtl Number^0.67

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