背压率大于80%，能排不凝结气体，膜盒坚固，使用寿命长，维修方便，使用范围很广。
Back pressure higher than 80%, to row non-condensing gas, diaphragm solid, long life, easy maintenance, using a wide range.
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.
本文利用自主设计的大空间凝结换热实验台，对水平光管和三维肋管管外高不凝性气体含量水蒸气的凝结换热性能进行了实验研究；
In the past decades, little efforts has been done on the investigation of condensation of steam in the presence of high content non-condensable gas due to its complication.
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