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?
Local friction coefficient calculator uses Local Friction Coefficient = 0.0592*(Reynolds Number(x)^(-0.2)) to calculate the Local Friction Coefficient, The Local friction coefficient 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 using this online calculator? To use this online calculator for Local friction coefficient, enter Reynolds Number(x) (Rex) and hit the calculate button. Here is how the Local friction coefficient calculation can be explained with given input values -> 0.038758 = 0.0592*(8.314^(-0.2)).