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6.凝结换热 6.1 凝结现象 (1) 均质凝结与非均质凝结若将蒸气缓慢冷却,达到饱和温度以下就发生相变而凝结为液体。这种凝结大致可分为均质凝结和非均质凝结。所谓均质凝结,就是在没有蒸气以外的不同物质的空间里,由于蒸气分子运动的起伏随机地引起的凝结过程。非均质凝结是以空间里的固体或液体等物质为核心,在其表面形成的凝结过程。在一般情况下,绝大多数为非均质凝结。 (2) 容积凝结与面积凝结这种非均质凝结还可分为两类:在空间发
6. Condensation Heat Exchange 6.1 Condensation Phenomenon (1) Homogeneous Condensation and Non-Homogeneous Condensation If the vapor is slowly cooled to reach the saturation temperature, the phase change takes place and the liquid condenses to a liquid. This condensation can be roughly divided into homogeneous and heterogeneous condensation. The so-called homogeneous coagulation, that is, in the absence of steam outside the space of different substances, due to fluctuations in the vapor molecular motion caused by random condensation process. Inhomogeneous condensation is a condensation process formed on the surface of a solid or liquid substance in space. Under normal circumstances, the vast majority of non-homogeneous condensation. (2) Volume condensation and area condensation This non-homogeneous condensation can be divided into two categories: