| 摘要: |
| 本文以纳米粒径为50 nm、质量分数为0.1%的三氧化二铝纳米流体液滴为研究对象，研究了纳米流体在玻璃载玻片4种不同底板加热温度（30、47、64、81 ℃）的蒸发过程，获得了纳米液滴在蒸发时的接触角、接触线半径的变化过程和温度分布过程，并用显微镜拍摄蒸发结果，观察蒸发后底板蒸发留下的沉积图案。结果表明：蒸发温度的不同未对蒸发模式产生显著影响；随着底板加热温度的升高，蒸发时间会大幅缩短（最长蒸发时间和最短蒸发时间相差10倍），初始马兰格尼数随底板温度的增加逐渐增大，但随着蒸发的不断进行，马兰格尼流动反而受到抑制。 |
| 关键词: 纳米流体 液滴蒸发 蒸发模式 温度分布 |
| DOI： |
| 投稿时间：2019-06-30 修订日期：2019-10-05
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| 基金项目:国家自然科学基金(51706154)资助项目 |
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| Effect of Substrate Temperature on Droplet Evaporation Mode and Temperature Field Distribution |
| Huang Xinlei,Liu Bin,Li Qinqin,Yang Wenzhe,Chen Aiqiang |
| (Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce) |
| Abstract: |
| The droplet evaporation process of Al2O3 nanofluid droplets with particle size 50 nm and mass fraction 0.1% were investigated experimentally. The actual evaporation behaviors of four types of heating temperatures (30, 47, 64, and 81 ℃) on the glass-slide substrate were studied to investigate the temperature field distribution of the gas liquid interface. The variation in the contact angle and contact line radius, and the temperature distribution of nanofluid droplets during evaporation were obtained, and the evaporation junctions were photographed with a microscope. As a result, the sedimentary patterns left by the evaporation of the bottom plate were observed. The results show that the difference in evaporation temperature does not have a significant effect on the evaporation mode. However, as the heating temperature of the bottom plate increases, the evaporation time is considerably shortened (the longest evaporation time is 10 times of the shortest). The initial Marangoni number increases gradually with the bottom plate temperature, but the Marangoni flow is inhibited with continuous evaporation. |
| Key words: nanofluid droplet evaporation evaporation mode temperature distribution |
