中国物理B ›› 2020, Vol. 29 ›› Issue (1): 14701-014701.doi: 10.1088/1674-1056/ab5782
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Hong-Hui Sun(孙弘辉), Wei-Bin Li(李伟斌), Wen-Jie Ji(纪文杰), Guo-Liang Dai(戴国亮), Yong Huan(郇勇), Yu-Ren Wang(王育人), Ding Lan(蓝鼎)
Hong-Hui Sun(孙弘辉)1,3, Wei-Bin Li(李伟斌)1,3, Wen-Jie Ji(纪文杰)1,2, Guo-Liang Dai(戴国亮)1,3, Yong Huan(郇勇)2,3, Yu-Ren Wang(王育人)1,3, Ding Lan(蓝鼎)1,3
摘要: The dynamic process of the evaporation and the desiccation of sessile saline colloidal droplets, and their final deposition are investigated. During the evaporation, the movement of the colloidal particles shows a strong dependence on the salt concentration and the droplet shape. The final deposition pattern indicates a weakened coffee-ring effect in this mixed droplet system. The microscopic observation reveals that as evaporation proceeds, the particle motion trail is affected by the salt concentration of the droplet boundary. The Marangoni flow, which is induced by surface tension gradient originating from the local evaporative peripheral salt enrichment, suppresses the compensation flow towards the contact line of the droplet. The inhomogeneous density and concentration field induced by evaporation or crystallization can be the major reason for various micro-flows. At last stage, the distribution and crystallization of NaCl are affected by the colloidal particles during the drying of the residual liquid film.
中图分类号: (Capillary and thermocapillary flows)