理论上，分析了低温容器表面水蒸气膜态凝结出现前后的换热机理。
The heat transfer mechanics before and after the film condensation formation was analyzed theoretically.
简单介绍了四阶段理论和蒸气膜内气体的流动规律及其对工件冷却快慢与冷却均匀性的影响。
Then the four-stage theory, the law of gas flow in vapor blanket and their influence upon the cooling rate and evenness of work pieces are discussed.
不同类型的绝缘材料会从空气中吸收不同量的水分，所以最好选择水蒸气不容易在其上形成连续膜的绝缘材料。
Different types of insulators will absorb varying amounts of water from the air, so it's best to choose an insulator on which water vapor doesn't readily form a continuous film.
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