铁酸锌纳米强化氨水发生过程实验研究
Experimental Investigation on Enhancement of Ammonia-water Falling Film Generation by Adding ZnFe2O4 Nano-particles

本文提出一种可直接测试有、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，通过实验对比分析了0%~0.5%质量浓度的纳米和分散剂、25%~40%质量浓度的氨水以及加热水温度对氨气发生率和相对发生率的影响。研究表明：添加合适质量分数的铁酸锌（ZnFe2O4）和十二烷基苯磺酸钠（SDBS）配制的氨水纳米流体可以增加氨气发生率。当氨水基液质量浓度为25%~40%时，添加质量分数分别为0.1%的ZnFe2O4和0.05%的SDBS，氨气发生率比原相应浓度的氨水基液约增加60%。但只添加分散剂SDBS会对氨气发生产生一定的抑制作用。选择分散剂用量时需兼顾分散稳定性和对发生起正或副作用，以达到最优效果。因此将纳米应用于吸收式制冷系统以提高系统的COP具有较广阔的前景。
This paper presents a falling film generating apparatus for testing ammonia vapor generation rate with/without nanoparticles. The comparative experiments were conducted to study the influence of the nanoparticle and surfactant with their mass fraction varying from 0% to 0.5%, the ammonia-water with the concentration varying from 25% to 40%, and the temperature of the hot water on ammonia vapor generation rate. Adding the optimal mass fraction of Zinc Ferrite(ZnFe2O4) with sodium dodecyl benzene sulfonate(SDBS) into ammonia water can significantly improve the generation rate of ammonia vapor. The effective generation ratio can be increased by 60% with the mass fraction of 0.1% ZnFe2O4 and the mass fraction of 0.05% SDBS when the concentration of the base fluid ammonia-water varies from 25% to 40%. However, only adding the dispersant SDBS will weaken the generation rate of ammonia vapor. In order to achieve optimal result, both positive and negative effects of dispersant on generation process are need to be taken into account. In view of the enhancement of ammonia-water nanofluid on generation process, the development of AARS should have a more promising future for their commercial application