### 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/m ^{2}·K]d _{h} = hydraulic diameter [m] = 4·A/sA = cross-sectional area [m ^{2}]s = wetted perimeter [m] λ = thermal conductivity [W/m·K] μ _{b} = dynamic bulk viscosity
[Pas]μ _{w} = 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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