Evaporation of binary droplets on heated superamphiphobic surfaces
| Parent link: | International Journal of Heat and Mass Transfer.— .— Amsterdam: Elsevier Science Publishing Company Inc. Vol. 240.— 2025.— Article number 126612, 12 p. |
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| Other Authors: | , , , , , , , , |
| Summary: | Title screen The evaporation of sessile liquid droplets on solid surfaces is crucial in diverse technological and industrial processes, ranging from inkjet printing to fuel combustion and electronic-cigarettes. This has stimulated tremendous research efforts on droplet evaporation; yet most of them were focusing on single-component liquids, while multi-component liquids remain largely unexplored. In this work, we conduct an experimental investigation on the evaporation dynamics of pure and binary droplets of propylene glycol (PG) and vegetable glycerol (VG) on heated superamphiphobic surfaces. We demonstrate that all sessile droplets initially evaporated with a constant contact angle (CCA) mode thanks to the excellent liquid-repellence of superamphiphobic surfaces, and then followed with a mixed mode, which is caused by the adsorption and accumulation of nanoparticles from the superamphiphobic surfaces into the evaporating droplets. Increasing either the mass ratio of the more volatile PG or surface temperature would notably shorten the lifetime of PG-VG binary droplets, but does not affect their relative durations of the CCA mode (∼80%) and the mixed mode (∼20%) of evaporation. Based on quantitative analyses of evaporation processes, we found that the long-duration CCA evaporation can be split up into two sub-stages, which correspond to the evaporation of the more volatile PG and the less volatile VG, respectively. The two-stage CCA evaporation and its dependence on surface temperature have been further analyzed by employing an effective diffusion coefficient that quantifies the overall diffusibility of liquid molecules from within the evaporating droplet to its surrounding air. Moreover, an empirical equation was derived to describe how the effective diffusion coefficient varies with the surface temperature in evaporating pure droplets Текстовый файл AM_Agreement |
| Language: | English |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://doi.org/10.1016/j.ijheatmasstransfer.2024.126612 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=679679 |