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 Nusselt number for gases and liquids?
Nusselt number for gases and liquids calculator uses Nusselt Number = 2+(0.4*(Reynolds Number^0.5)+0.06*(Reynolds Number^0.67))*(Prandtl Number^0.4)*(Dynamic Viscosity at Free Stream Temperature/Dynamic Viscosity at Wall Temperature)^0.25 to calculate the Nusselt Number, Nusselt number for gases and liquids formula is defined as a dimensionless quantity that characterizes convective heat transfer between a fluid and a solid sphere, providing a measure of the ratio of convective to conductive heat transfer. Nusselt Number is denoted by Nu symbol.
How to calculate Nusselt number for gases and liquids using this online calculator? To use this online calculator for Nusselt number for gases and liquids, enter Reynolds Number (Re), Prandtl Number (Pr), Dynamic Viscosity at Free Stream Temperature (μ∞) & Dynamic Viscosity at Wall Temperature (μw) and hit the calculate button. Here is how the Nusselt number for gases and liquids calculation can be explained with given input values -> 541.4116 = 2+(0.4*(50000^0.5)+0.06*(50000^0.67))*(19^0.4)*(0.0015/0.0018)^0.25.