Abstract
In this paper, the deposition patterns of alumina nanofluids with different particle size ratios (10 nm:30 nm = 0:1, 1:9, 3:7, 5:5 and 1:0) evaporated on different roughness (0.1, 0.15 and 0.2μm) substrates were studied. It was found that the surface roughness of substrates and particle size ratio in solution were important factors affecting the height of deposition rings and the morphology of deposition patterns. A dimensionless criterion number Ajw was defined to represent the deposition patterns. The Ajw number increases with the increase of the roughness of the floor and the proportion of small particles in the solution.
Highlights
Droplet evaporation is a complex thermodynamic behavior involving heat transfer and evaporation processes at three interfaces: solid-liquid, solid-gas and liquid-gas
The study of droplet evaporation characteristics has been widely applied in spray cooling and ink jet printing fields[1,2,3]
The experimental results show that the roughness of boards affects the distance or number of cracks; Yongjian Zhang, et al.[10]studied the deposition patterns of silica nanoparticles suspension solution on different roughness surfaces were studied and compared, and the results showed that roughness
Summary
Droplet evaporation is a complex thermodynamic behavior involving heat transfer and evaporation processes at three interfaces: solid-liquid, solid-gas and liquid-gas. The study of droplet evaporation characteristics has been widely applied in spray cooling and ink jet printing fields[1,2,3]. The research of droplet evaporation characteristics has been carried out in the field of spray cooling and ink jet printing. Liu et al.[9] studied the crack pattern formed by evaporation of dried colloidal suspension droplets on different surface roughness boards. The experimental results show that the roughness of boards affects the distance or number of cracks; Yongjian Zhang, et al.[10]studied the deposition patterns of silica nanoparticles suspension solution on different roughness surfaces were studied and compared, and the results showed that roughness. This paper studies the effect of the two on the deposition pattern by changing the roughness of the bottom plate and the particle size ratio of Al2O3-H2O solution. The shape and size of the deposition pattern are observed by microscopy and three-dimensional surface measurement instrument, and the specific effects of the roughness and particle size ratio are discussed
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