Local friction coefficient for external flow Calculator

✖Wall shear stress is defined as the shear stress in the layer of fluid next to the wall of a pipe.ⓘ Wall Shear Stress [τ_w]			+10% -10%
✖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.ⓘ Density [ρ]			+10% -10%
✖Free Stream Velocity is defined as at some distance above the boundary the velocity reaches a constant value that is free stream velocity.ⓘ Free Stream Velocity [u_∞]			+10% -10%

✖Local Friction Coefficient for the flow in ducts is the ratio of wall shearing stress and dynamic head of the stream.ⓘ Local friction coefficient for external flow [C_fx]

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Local friction coefficient for external flow Solution

STEP 0: Pre-Calculation Summary

Formula Used

Local Friction Coefficient = 2*Wall Shear Stress/(Density*Free Stream Velocity^2)
C_fx = 2*τ_w/(ρ*u_∞^2)
This formula uses 4 Variables

Variables Used

Local Friction Coefficient - Local Friction Coefficient for the flow in ducts is the ratio of wall shearing stress and dynamic head of the stream.
Wall Shear Stress - (Measured in Pascal) - Wall shear stress is defined as the shear stress in the layer of fluid next to the wall of a pipe.
Density - (Measured in Kilogram per Cubic Meter) - 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.
Free Stream Velocity - (Measured in Meter per Second) - Free Stream Velocity is defined as at some distance above the boundary the velocity reaches a constant value that is free stream velocity.

STEP 1: Convert Input(s) to Base Unit

Wall Shear Stress: 801189.2 Pascal --> 801189.2 Pascal No Conversion Required
Density: 997 Kilogram per Cubic Meter --> 997 Kilogram per Cubic Meter No Conversion Required
Free Stream Velocity: 70 Meter per Second --> 70 Meter per Second No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

C_fx = 2*τ_w/(ρ*u_∞^2) --> 2*801189.2/(997*70^2)

Evaluating ... ...

C_fx = 0.328

STEP 3: Convert Result to Output's Unit

0.328 --> No Conversion Required

FINAL ANSWER

0.328 <-- Local Friction Coefficient

(Calculation completed in 00.020 seconds)

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< Laminar Flow Calculators

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Displacement thickness

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Momentum thickness

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Local friction coefficient for external flow Formula

LaTeX Go

Local Friction Coefficient = 2*Wall Shear Stress/(Density*Free Stream Velocity^2)
C_fx = 2*τ_w/(ρ*u_∞^2)

What is external flow?

In fluid mechanics, external flow is such a flow that boundary layers develop freely, without constraints imposed by adjacent surfaces. Accordingly, there will always exist a region of the flow outside the boundary layer in which velocity, temperature, and/or concentration gradients are negligible. It can be defined as the flow of a fluid around a body that is completely submerged in it.
An example includes fluid motion over a flat plate (inclined or parallel to the free stream velocity) and flow over curved surfaces such as a sphere, cylinder, airfoil, or turbine blade, air flowing around an airplane and water flowing around the submarines.

How to Calculate Local friction coefficient for external flow?

Local friction coefficient for external flow calculator uses Local Friction Coefficient = 2*Wall Shear Stress/(Density*Free Stream Velocity^2) to calculate 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 calculate Local friction coefficient for external flow using this online calculator? To use this online calculator for Local friction coefficient for external flow, enter Wall Shear Stress (τ_w), Density (ρ) & Free Stream Velocity (u_∞) and hit the calculate button. Here is how the Local friction coefficient for external flow calculation can be explained with given input values -> 1.4E-6 = 2*801189.2/(997*70^2).

FAQ

What is Local friction coefficient for external flow?

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 and is represented as C_fx = 2*τ_w/(ρ*u_∞^2) or Local Friction Coefficient = 2*Wall Shear Stress/(Density*Free Stream Velocity^2). Wall shear stress is defined as the shear stress in the layer of fluid next to the wall of a pipe, 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 & Free Stream Velocity is defined as at some distance above the boundary the velocity reaches a constant value that is free stream velocity.

How to calculate Local friction coefficient for external flow?

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 is calculated using Local Friction Coefficient = 2*Wall Shear Stress/(Density*Free Stream Velocity^2). To calculate Local friction coefficient for external flow, you need Wall Shear Stress (τ_w), Density (ρ) & Free Stream Velocity (u_∞). With our tool, you need to enter the respective value for Wall Shear Stress, Density & Free Stream Velocity and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Local Friction Coefficient?

In this formula, Local Friction Coefficient uses Wall Shear Stress, Density & Free Stream Velocity. We can use 1 other way(s) to calculate the same, which is/are as follows -

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

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