Calculation of the individual heat transfer coefficient

The following equation is valid for turbulent flow conditions (Hausen):
		where α = individual heat transfer coefficient [W/m2·K] dh = hydraulic diameter [m] = 4·A/s A = cross-sectional area [m2] s = wetted perimeter [m] λ = thermal conductivity [W/m·K] μb = dynamic bulk viscosity [Pas] μw = dynamic wall viscosity [Pas] L = tube length [m] Re = Reynolds number [ - ] Pr = Prandtl number [ - ]
The equation is valid for:
The following equation is also valid (Dittus - Boelter):
This equation is valid for:
A large number of other equations are available in literature, for different fluids, flow conditions and geometries.