When various manipulations disturb the thermal boundary layer inside or the condensatefilm and gas-vapor diffusion layer outside, the heat transfer effect will be better or be worse off.
各种操作条件只有影响到管程的温度边界层或壳程的冷凝液膜层和气-汽扩散层，才能强化或恶化传热过程。
2
The recirculation and utilization of condensate water out of the falling-film evaporator;