为查明不凝气体对水平管外膜状凝结换热特性的影响规律，建立了水平单管的气、液双边界层模型。
Film condensation heat transfer characteristics are studied by numerical simulation for a single horizontal tube in the presence of a non condensable gas.
凝结换热有两种形式：珠状凝结和膜状凝结。
There are two kinds of condensation: dropwise condensation and film condensation.
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