Undirected implementation of the Conduction Element for the DiscritizedHex.
Concerning the heat transfer it is assumed, that the main term influencing the coefficient of heat transfer is the mass flow rate. Therefore a nominal value for the heat transfer coefficient at a nominal mass flow rate can be set. Furthermore a minimum value U_min for the coefficient of heat transfer is set to ensure heat transfer at zero mass flow.
For further documentation see the documentation of the motherclass.