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)
Cfx = 2*τw/(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: 3.5 Pascal --> 3.5 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
Cfx = 2*τw/(ρ*u^2) --> 2*3.5/(997*70^2)
Evaluating ... ...
Cfx = 1.43287003868749E-06
STEP 3: Convert Result to Output's Unit
1.43287003868749E-06 --> No Conversion Required
FINAL ANSWER
1.43287003868749E-06 1.4E-6 <-- Local Friction Coefficient
(Calculation completed in 00.004 seconds)

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15 Laminar Flow Calculators

Average temperature difference between plate and fluid
Go Average Temperature Difference = ((Heat Flux*Distance L/Thermal Conductivity))/(0.679*(Reynolds Number at Location L^0.5)*(Prandtl Number^0.333))
Free stream velocity given local friction coefficient
Go Free Stream Velocity = sqrt((2*Wall Shear Stress)/(Density*Local Friction Coefficient))
Density given local friction coefficient
Go Density = 2*Wall Shear Stress/(Local Friction Coefficient*(Free Stream Velocity^2))
Wall shear stress
Go Wall Shear Stress = (Local Friction Coefficient*Density*(Free Stream Velocity^2))/2
Local friction coefficient for external flow
Go Local Friction Coefficient = 2*Wall Shear Stress/(Density*Free Stream Velocity^2)
Hydrodynamic boundary layer thickness at distance X from leading edge
Go Hydrodynamic Boundary Layer Thickness = 5*Distance from Point to YY Axis*Reynolds Number(x)^(-0.5)
Thermal boundary layer thickness at distance X from leading edge
Go Thermal Boundary Layer Thickness = Hydrodynamic Boundary Layer Thickness*Prandtl Number^(-0.333)
Film temperature
Go Film temperature = (Plate Surface Temperature+Free Stream Fluid Temperature)/2
Free stream fluid temperature
Go Free Stream Fluid Temperature = 2*Film temperature-Plate Surface Temperature
Plate surface temperature
Go Plate Surface Temperature = 2*Film temperature-Free Stream Fluid Temperature
Coefficient of friction given Stanton number
Go Coefficient of Friction = 2*Stanton Number*(Prandtl Number^(2/3))
Displacement thickness
Go Displacement Thickness = Hydrodynamic Boundary Layer Thickness/3
Average friction coefficient
Go Average Friction Coefficient = 1.328*Reynolds Number(x)^(-0.5)
Local Friction Coefficient given Reynolds Number
Go Local Friction Coefficient = 0.664*Reynolds Number(x)^(-0.5)
Momentum thickness
Go Momentum Thickness = Hydrodynamic Boundary Layer Thickness/7

Local friction coefficient for external flow Formula

Local Friction Coefficient = 2*Wall Shear Stress/(Density*Free Stream Velocity^2)
Cfx = 2*τw/(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, The Local friction coefficient for external flow formula is defined as the ratio between local shear stress to characteristic dynamics pressure. Local Friction Coefficient is denoted by Cfx 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 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 -> 7E-5 = 2*3.5/(997*70^2).

FAQ

What is Local friction coefficient for external flow?
The Local friction coefficient for external flow formula is defined as the ratio between local shear stress to characteristic dynamics pressure and is represented as Cfx = 2*τw/(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?
The Local friction coefficient for external flow formula is defined as the ratio between local shear stress to characteristic dynamics pressure 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 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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