疏水性纳米颗粒提高水分蒸发速率的研究

Hydrophobic Nanoparticle to Enhance Water Evaporation Rate

本文结合实验测试和理论分析探究疏水性纳米颗粒的添加对去离子水蒸发速率的影响。采用表面化学修饰法得到不同粒径疏水性纳米颗粒,两步法制备纳米流体并用称重法测定其蒸发速率。研究结果表明疏水性纳米颗粒的添加提高了水的蒸发速率,并且颗粒粒径越小、质量分数越高,效果越明显,其中添加质量分数为0.02%的13 nm Al_2O_3疏水性颗粒使水蒸发速率提高了15%。在实验基础上,建立了纳米流体蒸发速率的半经验理论模型,并对其影响因素进行了分析。

The effects of hydrophobic nanoparticle on deionized water were experimentally and theoretically studied in the paper. Surface chemical modification method was adapted to synthesize hydrophobic nanoparticles with different diameters. Water-based nanofluids were prepared by two-step technique and the evaporation rates of which were measured using gravimetric method. Results indicate that water evaporation rates increase after the addition of hydrophobic nanoparticles. The magnitudes of enhancement are related to the diameter and mass concentration of nanoparticles. In particular, a 15% enhancement was achieved at a mass concentration of 0.02% and a particle diameter of 13 nm. On the basis of the experimental results, a semi empirical model was established and the influence factors were analyzed.