【摘要】 用蒸汽喷射作为提升液体的动力,在1.5m长的管内实现了稳定的升膜蒸发,并对该升膜两相流动及传热进行了实验研究和理论分析.研究结果表明,蒸汽喷射对蒸发传热有一定的强化作用,以蒸汽喷射作为提升动力的经济性可以接受.考察了蒸汽喷射升液膜的流动及蒸发传热机理,建立了环状流传热模型,考虑了膜流动界面波的影响.模型计算值与实验值吻合较好.更多还原

【Abstract】 Steam nozzles were used to pump liquid in a climbing - film evaporation experimental system. In fact, a jet was formed by the nozzle and an evaporation tube. Two phase flow and heat transfer of climbing- film evaporation with steam injection pumping were studied experimentally and theoretically. The experimental results showed that steam injection enhanced heat transfer of evaporation and only a small amount of steam was consumed for pumping. A heat transfer model was presented, in which effects of interfacial wave on heat transfer were considered. The model was found in good agreement with the experimental data.更多还原