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提出一种可以直接测试有、无纳米氨水溶液氨气发生量的氨水纳米降膜发生实验装置,通过有、无纳米的氨水溶液对比实验,发现添加合适纳米颗粒能够增加氨气发生率。结合氨水纳米溶液降膜发生过程试验结果,以及前人关于纳米颗粒强化传热传质方面的研究,分别从纳米粒子的微运动、界面效应、Marangoni效应、纳米流体物性等方面进行强化发生机理分析,证明纳米流体的粒子微运动和纳米流体的物性是纳米流体强化氨水降膜发生的两大主要因素。
An experimental device for the determination of NH3 drop in the presence of ammonia gas without ammonia solution was proposed. The experimental results show that addition of suitable nano-particles can increase the incidence of ammonia. Based on the experimental results of falling film formation of aqueous ammonia solution and the previous studies on the enhanced heat and mass transfer of nanoparticles, the mechanism of strengthening mechanism was analyzed respectively from the micro-motion of nanoparticles, the interface effect, the Marangoni effect and the properties of nanofluids It is proved that the nano-fluid particle movement and the properties of nanofluids are the two main factors of nanofluid-enhanced ammonia-induced film drop.