The heat-transfer process of condensers mainly exists on the side of steam, however, the condensing heat transfer on the side of steam is the forced-convection one of steam-gas mixture which relates to the non-condensing gas, whose flow and heat-transfer performance severely vary along the cooling surface. 由于凝汽器的传热过程主要汽阻产生于汽侧,而汽侧的凝结换热为含有不凝结气体的汽气混合物的强迫对流换热,其流动与传热特性沿着冷却表面剧烈变化。