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Friction factor for rough tubes Formula

GoFriction factor for Re greater than 2300 Formula

GoFriction factor for Re greater than 10000 Formula

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The Friction Factor is a dimensionless number that quantifies the resistance to flow in a pipe due to friction, particularly in turbulent flow conditions. Check FAQs

f = \frac{1.325}{{(\ln ((\frac{e}{3.7} \cdot D) + (\frac{5.74}{{Re}^{0.9}})))}^{2}}

f - Friction Factor?e - Surface Roughness?D - Diameter?Re - Reynolds Number?

Friction factor for rough tubes Example

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Here is how the Friction factor for rough tubes equation looks like with Values.

Here is how the Friction factor for rough tubes equation looks like with Units.

Here is how the Friction factor for rough tubes equation looks like.

0.0426 = \frac{1.325}{{(\ln ((\frac{0.0004}{3.7} \cdot 10) + (\frac{5.74}{5000^{0.9}})))}^{2}}

0.0426 = \frac{1.325}{{(\ln ((\frac{0.0004}{3.7} \cdot 10m) + (\frac{5.74}{5000^{0.9}})))}^{2}}

0.0426 = \frac{1.325}{{(\ln ((\frac{0.0004}{3.7} \cdot 10) + (\frac{5.74}{5000^{0.9}})))}^{2}}

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Friction factor for rough tubes Solution

Follow our step by step solution on how to calculate Friction factor for rough tubes?

FIRST Step Consider the formula

f = \frac{1.325}{{(\ln ((\frac{e}{3.7} \cdot D) + (\frac{5.74}{{Re}^{0.9}})))}^{2}}

Next Step Substitute values of Variables

∴

f = \frac{1.325}{{(\ln ((\frac{0.0004}{3.7} \cdot 10m) + (\frac{5.74}{5000^{0.9}})))}^{2}}

Next Step Prepare to Evaluate

∴

f = \frac{1.325}{{(\ln ((\frac{0.0004}{3.7} \cdot 10) + (\frac{5.74}{5000^{0.9}})))}^{2}}

Next Step Evaluate

∴

f = 0.0425508620777238

LAST Step Rounding Answer

∴

f = 0.0426

Friction factor for rough tubes Formula Elements

Variables

Functions

Friction Factor

The Friction Factor is a dimensionless number that quantifies the resistance to flow in a pipe due to friction, particularly in turbulent flow conditions.

Symbol: f

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Friction Factor

Surface Roughness

The Surface Roughness is a measure of the texture of a surface, indicating how smooth or rough it is, which can affect fluid flow and heat transfer.

Symbol: e

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Surface Roughness

Diameter

The Diameter is the straight line passing through the center of a circle or tube, connecting two points on its boundary, crucial for understanding flow characteristics in turbulent systems.

Symbol: D

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Diameter

Reynolds Number

The Reynolds Number is a dimensionless quantity that helps predict flow patterns in different fluid flow situations, particularly in determining whether the flow is laminar or turbulent.

Symbol: Re

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Reynolds Number

The natural logarithm, also known as the logarithm to the base e, is the inverse function of the natural exponential function.

Syntax: ln(Number)

Other Formulas to find Friction Factor

Go Friction factor for Re greater than 2300

f = 0.25 \cdot {(1.82 \cdot \log 10 (Re D) - 1.64)}^{- 2}

Go Friction factor for Re greater than 10000

f = 0.184 \cdot {Re D}^{- 0.2}

Go Friction factor for transitional turbulent flow

f = 0.316 \cdot {Re D}^{- 0.25}

Go Friction factor for rough tube Colburn analogy

f = 8 \cdot St \cdot ({Pr}^{0.67})

Other formulas in Turbulent Flow category

Go Nusselt number at entrance region

Nu = 0.036 \cdot ({Re D}^{0.8}) \cdot ({Pr}^{0.33}) \cdot {(\frac{D}{L})}^{0.055}

Go Nusselt number for short pipes

Nu Avg = Nu \cdot (1 + (\frac{a}{\frac{L}{D}}))

Go Nusselt number for Smooth tubes

Nu = 0.027 \cdot {Re D}^{0.8} \cdot {Pr}^{0.333} \cdot {(\frac{μ m}{μ w})}^{0.14}

Go Stanton number at bulk temperature

St = \frac{f}{8 \cdot {Pr}^{0.67}}

How to Evaluate Friction factor for rough tubes?

Friction factor for rough tubes evaluator uses Friction Factor = 1.325/((ln((Surface Roughness/3.7*Diameter)+(5.74/(Reynolds Number^0.9))))^2) to evaluate the Friction Factor, The Friction factor for rough tubes formula is defined as the loss of pressure of a fluid in a pipe due to the interactions in between the fluid and the pipe. Friction Factor is denoted by f symbol.

How to evaluate Friction factor for rough tubes using this online evaluator? To use this online evaluator for Friction factor for rough tubes, enter Surface Roughness (e), Diameter (D) & Reynolds Number (Re) and hit the calculate button.

FAQs on Friction factor for rough tubes

What is the formula to find Friction factor for rough tubes?

The formula of Friction factor for rough tubes is expressed as Friction Factor = 1.325/((ln((Surface Roughness/3.7*Diameter)+(5.74/(Reynolds Number^0.9))))^2). Here is an example- 0.041439 = 1.325/((ln((0.0004/3.7*10)+(5.74/(5000^0.9))))^2).

How to calculate Friction factor for rough tubes?

With Surface Roughness (e), Diameter (D) & Reynolds Number (Re) we can find Friction factor for rough tubes using the formula - Friction Factor = 1.325/((ln((Surface Roughness/3.7*Diameter)+(5.74/(Reynolds Number^0.9))))^2). This formula also uses Natural Logarithm (ln) function(s).

What are the other ways to Calculate Friction Factor?

Here are the different ways to Calculate Friction Factor-

Friction Factor=0.25*(1.82*log10(Reynolds Number Dia)-1.64)^-2
Friction Factor=0.184*Reynolds Number Dia^(-0.2)
Friction Factor=0.316*Reynolds Number Dia^-0.25

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: Unit

Friction factor for rough tubes Formula

​GoFriction factor for Re greater than 2300 Formula

​GoFriction factor for Re greater than 10000 Formula

Friction factor for rough tubes Example

Friction factor for rough tubes Solution

Friction factor for rough tubes Formula Elements

Other Formulas to find Friction Factor

Other formulas in Turbulent Flow category

How to Evaluate Friction factor for rough tubes?

FAQs on Friction factor for rough tubes

Variable Name

GoFriction factor for Re greater than 2300 Formula

GoFriction factor for Re greater than 10000 Formula