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Local friction coefficient for external flow Formula

GoLocal Friction Coefficient given Reynolds Number Formula

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Local Friction Coefficient for the flow in ducts is the ratio of wall shearing stress and dynamic head of the stream. Check FAQs

C fx = 2 \cdot \frac{τ w}{ρ \cdot {u ∞}^{2}}

C_fx - Local Friction Coefficient?τ_w - Wall Shear Stress?ρ - Density?u_∞ - Free Stream Velocity?

Local friction coefficient for external flow Example

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Here is how the Local friction coefficient for external flow equation looks like with Values.

Here is how the Local friction coefficient for external flow equation looks like with Units.

Here is how the Local friction coefficient for external flow equation looks like.

0.328 = 2 \cdot \frac{801189.2}{997 \cdot 70^{2}}

0.328 = 2 \cdot \frac{801189.2Pa}{997kg/m³ \cdot {70m/s}^{2}}

0.328 = 2 \cdot \frac{801189.2}{997 \cdot 70^{2}}

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Local friction coefficient for external flow Solution

Follow our step by step solution on how to calculate Local friction coefficient for external flow?

FIRST Step Consider the formula

C fx = 2 \cdot \frac{τ w}{ρ \cdot {u ∞}^{2}}

Next Step Substitute values of Variables

∴

C fx = 2 \cdot \frac{801189.2Pa}{997kg/m³ \cdot {70m/s}^{2}}

Next Step Prepare to Evaluate

∴

C fx = 2 \cdot \frac{801189.2}{997 \cdot 70^{2}}

LAST Step Evaluate

∴

C fx = 0.328

Local friction coefficient for external flow Formula Elements

Variables

Local Friction Coefficient

Local Friction Coefficient for the flow in ducts is the ratio of wall shearing stress and dynamic head of the stream.

Symbol: C_fx

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Local Friction Coefficient

Wall Shear Stress

Wall shear stress is defined as the shear stress in the layer of fluid next to the wall of a pipe.

Symbol: τ_w

Measurement: PressureUnit: Pa

Note: Value can be positive or negative.

Formulas to find Wall Shear Stress

Density

The Density of a material shows the denseness of that material in a specific given area. This is taken as mass per unit volume of a given object.

Symbol: ρ

Measurement: DensityUnit: kg/m³

Note: Value should be greater than 0.

Formulas to find Density

Free Stream Velocity

Free Stream Velocity is defined as at some distance above the boundary the velocity reaches a constant value that is free stream velocity.

Symbol: u_∞

Measurement: SpeedUnit: m/s

Note: Value can be positive or negative.

Formulas to find Free Stream Velocity

Other Formulas to find Local Friction Coefficient

Go Local Friction Coefficient given Reynolds Number

C fx = 0.664 \cdot {Re x}^{- 0.5}

Other formulas in Laminar Flow category

Go Hydrodynamic boundary layer thickness at distance X from leading edge

𝛿hx = 5 \cdot x \cdot {Re x}^{- 0.5}

Go Thermal boundary layer thickness at distance X from leading edge

𝛿Tx = 𝛿hx \cdot {Pr}^{- 0.333}

Go Displacement thickness

𝛿 d = \frac{𝛿hx}{3}

Go Momentum thickness

θ = \frac{𝛿hx}{7}

How to Evaluate Local friction coefficient for external flow?

Local friction coefficient for external flow evaluator uses Local Friction Coefficient = 2*Wall Shear Stress/(Density*Free Stream Velocity^2) to evaluate the Local Friction Coefficient, Local friction coefficient for external flow formula is defined as a dimensionless measure of the shear stress at the surface of a flat plate, characterizing the resistance to fluid flow over the plate's surface, and is used to predict the frictional forces acting on the plate. Local Friction Coefficient is denoted by C_fx symbol.

How to evaluate Local friction coefficient for external flow using this online evaluator? To use this online evaluator for Local friction coefficient for external flow, enter Wall Shear Stress (τ_w), Density (ρ) & Free Stream Velocity (u_∞) and hit the calculate button.

FAQs on Local friction coefficient for external flow

What is the formula to find Local friction coefficient for external flow?

The formula of Local friction coefficient for external flow is expressed as Local Friction Coefficient = 2*Wall Shear Stress/(Density*Free Stream Velocity^2). Here is an example- 1.4E-6 = 2*801189.2/(997*70^2).

How to calculate Local friction coefficient for external flow?

With Wall Shear Stress (τ_w), Density (ρ) & Free Stream Velocity (u_∞) we can find Local friction coefficient for external flow using the formula - Local Friction Coefficient = 2*Wall Shear Stress/(Density*Free Stream Velocity^2).

What are the other ways to Calculate Local Friction Coefficient?

Here are the different ways to Calculate Local Friction Coefficient-

Local Friction Coefficient=0.664*Reynolds Number(x)^(-0.5)

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Local friction coefficient for external flow Formula

​GoLocal Friction Coefficient given Reynolds Number Formula

Local friction coefficient for external flow Example

Local friction coefficient for external flow Solution

Local friction coefficient for external flow Formula Elements

Other Formulas to find Local Friction Coefficient

Other formulas in Laminar Flow category

How to Evaluate Local friction coefficient for external flow?

FAQs on Local friction coefficient for external flow

Variable Name

GoLocal Friction Coefficient given Reynolds Number Formula