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Indian Institute of Technology Kharagpur (IIT KGP), Kharagpur
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Skin friction coefficient Solution

STEP 0: Pre-Calculation Summary
Formula Used
skin_friction_coefficient = (2*log10(Reynolds Number)-0.65)^(-2.30)
cf = (2*log10(Re)-0.65)^(-2.30)
This formula uses 2 Functions, 1 Variables
Functions Used
log10 - Common logarithm function (base 10), log10(Number)
log - Logarithm function, log(Number, Base)
Variables Used
Reynolds Number- The Reynolds number is the ratio of inertial forces to viscous forces within a fluid which is subjected to relative internal movement due to different fluid velocities. A region where these forces change behavior is known as a boundary layer, such as the bounding surface in the interior of a pipe.
STEP 1: Convert Input(s) to Base Unit
Reynolds Number: 5000 --> No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
cf = (2*log10(Re)-0.65)^(-2.30) --> (2*log10(5000)-0.65)^(-2.30)
Evaluating ... ...
cf = 0.0123852908639912
STEP 3: Convert Result to Output's Unit
0.0123852908639912 --> No Conversion Required
FINAL ANSWER
0.0123852908639912 <-- Skin friction coefficient
(Calculation completed in 00.000 seconds)

7 CFD Calculators

Lift on airfoil
Lift_on_airfoil = Normal Force on airfoil*cos(Angle of Attack of airfoil)-Axial Force on airfoil*sin(Angle of Attack of airfoil) Go
Drag on airfoil
Drag_on_airfoil = Normal Force on airfoil*sin(Angle of Attack of airfoil)+Axial Force on airfoil*cos(Angle of Attack of airfoil) Go
Reynolds Number for airfoil
reynolds_number = (Density of fluid*Flow Velocity*Chord Length of Airfoil)/Dynamic viscosity Go
Y plus
Y_plus = First layer height*Density of air*Friction Velocity for airfoil/Kinematic viscosity Go
Wall Shear Stress for airfoil
wall_shear_stress = 0.5*Skin friction coefficient*Flow Velocity*Density of air Go
Friction Velocity for airfoil
Friction_Velocity_for_airfoil = (Wall Shear Stress for airfoil/Density of air)^0.5 Go
Skin friction coefficient
skin_friction_coefficient = (2*log10(Reynolds Number)-0.65)^(-2.30) Go

Skin friction coefficient Formula

skin_friction_coefficient = (2*log10(Reynolds Number)-0.65)^(-2.30)
cf = (2*log10(Re)-0.65)^(-2.30)

How to Calculate Skin friction coefficient?

Skin friction coefficient calculator uses skin_friction_coefficient = (2*log10(Reynolds Number)-0.65)^(-2.30) to calculate the Skin friction coefficient, The Skin friction coefficient is a dimensionless skin shear stress which is nondimensionalized by the dynamic pressure of a free stream. Skin friction coefficient is denoted by cf symbol.

How to calculate Skin friction coefficient using this online calculator? To use this online calculator for Skin friction coefficient, enter Reynolds Number (Re) and hit the calculate button. Here is how the Skin friction coefficient calculation can be explained with given input values -> 0.012385 = (2*log10(5000)-0.65)^(-2.30).

FAQ

What is Skin friction coefficient?
The Skin friction coefficient is a dimensionless skin shear stress which is nondimensionalized by the dynamic pressure of a free stream and is represented as cf = (2*log10(Re)-0.65)^(-2.30) or skin_friction_coefficient = (2*log10(Reynolds Number)-0.65)^(-2.30). The Reynolds number is the ratio of inertial forces to viscous forces within a fluid which is subjected to relative internal movement due to different fluid velocities. A region where these forces change behavior is known as a boundary layer, such as the bounding surface in the interior of a pipe.
How to calculate Skin friction coefficient?
The Skin friction coefficient is a dimensionless skin shear stress which is nondimensionalized by the dynamic pressure of a free stream is calculated using skin_friction_coefficient = (2*log10(Reynolds Number)-0.65)^(-2.30). To calculate Skin friction coefficient, you need Reynolds Number (Re). With our tool, you need to enter the respective value for Reynolds Number 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 Skin friction coefficient?
In this formula, Skin friction coefficient uses Reynolds Number. We can use 7 other way(s) to calculate the same, which is/are as follows -
  • reynolds_number = (Density of fluid*Flow Velocity*Chord Length of Airfoil)/Dynamic viscosity
  • skin_friction_coefficient = (2*log10(Reynolds Number)-0.65)^(-2.30)
  • wall_shear_stress = 0.5*Skin friction coefficient*Flow Velocity*Density of air
  • Friction_Velocity_for_airfoil = (Wall Shear Stress for airfoil/Density of air)^0.5
  • Y_plus = First layer height*Density of air*Friction Velocity for airfoil/Kinematic viscosity
  • Lift_on_airfoil = Normal Force on airfoil*cos(Angle of Attack of airfoil)-Axial Force on airfoil*sin(Angle of Attack of airfoil)
  • Drag_on_airfoil = Normal Force on airfoil*sin(Angle of Attack of airfoil)+Axial Force on airfoil*cos(Angle of Attack of airfoil)
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