Deposition patterns from evaporating sessile droplets with suspended mixtures of multi-sized and multi-species hydrophilic and non-adsorbing nanoparticles

作者：Zhong Xin; Xie Hanlin; Duan Fei

来源：Applied Thermal Engineering, 2017, 111: 1565-1572.

DOI：10.1016/j.applthermaleng.2016.08.040

• Multi-size
• Multi-species
• Nanofluids
• Droplet Evaporation

Effects of multi-sized and multi-species nanoparticles on the deposition profiles from evaporating sessile droplets are investigated experimentally. With specific combinations of the small and the large size alumina nanoparticles, the heterogeneities of the two single-sized nanoparticle patterns are eliminated, and a homogeneous mixture pattern is produced. The small particles prevent the droplet from shrinking which occurs in the droplet of the large alumina nanoparticles, and the interactions between the small and the large particles suppress the center-oriented accumulation of the small nanoparticles taking place in the droplet of the small nanoparticles. The mixture pattern assembled by two different species of nanoparticles either exhibits both the features of the single-species patterns or is analogous to solely one of them. An energy dispersive X-ray spectroscope analysis confirms that each nanoparticle species tends to behave similarly for its mixture pattern and its single species pattern. Nanoparticles with a greater pinning effect prohibit the inward transport of the other species, while two nanoparticle species behaving similarly in their single patterns repeat their respective features in the mixture pattern. Particle-particle interactions coupling with the particle-dependent droplet dynamics controls the deposit morphology from the nanofluid droplets.

• 出版日期2017-1-25
• 单位南阳理工学院