Calculation of the individual heat transfer coefficient
Forced convection, turbulent flow
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. |
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Dimensionless numbers and equations |
Forced convection, laminar flow |
Typical Nu - Pr - Re relationship |
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