Stable hydrothermal waves at steady state evaporating droplet surface
Stable hydrothermal waves (HTWs) are found at a sessile ethanol droplet surface under the steady state evaporation. It is different from those which greatly decrease with the evaporation time in the transient droplet drying process. This study removes the possible effect of shrinking droplet on HTWs...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2018
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| Online Access: | https://hdl.handle.net/10356/88277 http://hdl.handle.net/10220/45673 |
| _version_ | 1826113838944092160 |
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| author | Zhong, Xin Duan, Fei |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Zhong, Xin Duan, Fei |
| author_sort | Zhong, Xin |
| collection | NTU |
| description | Stable hydrothermal waves (HTWs) are found at a sessile ethanol droplet surface under the steady state evaporation. It is different from those which greatly decrease with the evaporation time in the transient droplet drying process. This study removes the possible effect of shrinking droplet on HTWs. An analysis of the dimensionless numbers indicates the increasingly enhanced role of thermocapillary instabilities upon raising the substrate temperature. The onset HTWs can be continuously maintained under the steady state evaporation conditions. Interestingly, the stable number of HTWs follows a linear fitting with the dimensionless factor incorporating the normalized temperature difference between the substrate and the surroundings and the droplet aspect ratio. The temperature heterogeneity of HTWs is intensified by increasing the substrate temperature. The stable HTWs exhibit the “one source-to-one sink” propagation at lower substrate temperatures. However, such directional traveling, normally presented in the transient HTWs in the drying droplet, is changed at the higher substrate temperatures due to the newly emerged sources and sinks under the steady state conditions. |
| first_indexed | 2024-10-01T03:29:47Z |
| format | Journal Article |
| id | ntu-10356/88277 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:29:47Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/882772023-03-04T17:12:11Z Stable hydrothermal waves at steady state evaporating droplet surface Zhong, Xin Duan, Fei School of Mechanical and Aerospace Engineering Evaporation DRNTU::Engineering::Mechanical engineering Hydrothermal Waves Stable hydrothermal waves (HTWs) are found at a sessile ethanol droplet surface under the steady state evaporation. It is different from those which greatly decrease with the evaporation time in the transient droplet drying process. This study removes the possible effect of shrinking droplet on HTWs. An analysis of the dimensionless numbers indicates the increasingly enhanced role of thermocapillary instabilities upon raising the substrate temperature. The onset HTWs can be continuously maintained under the steady state evaporation conditions. Interestingly, the stable number of HTWs follows a linear fitting with the dimensionless factor incorporating the normalized temperature difference between the substrate and the surroundings and the droplet aspect ratio. The temperature heterogeneity of HTWs is intensified by increasing the substrate temperature. The stable HTWs exhibit the “one source-to-one sink” propagation at lower substrate temperatures. However, such directional traveling, normally presented in the transient HTWs in the drying droplet, is changed at the higher substrate temperatures due to the newly emerged sources and sinks under the steady state conditions. ASTAR (Agency for Sci., Tech. and Research, S’pore) Published version 2018-08-27T03:37:04Z 2019-12-06T16:59:41Z 2018-08-27T03:37:04Z 2019-12-06T16:59:41Z 2017 Journal Article Zhong, X., & Duan, F. (2017). Stable hydrothermal waves at steady state evaporating droplet surface. Scientific Reports, 7, 16219-. doi:10.1038/s41598-017-16582-0 2045-2322 https://hdl.handle.net/10356/88277 http://hdl.handle.net/10220/45673 10.1038/s41598-017-16582-0 en Scientific Reports © 2017 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Te images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. 9 p. application/pdf |
| spellingShingle | Evaporation DRNTU::Engineering::Mechanical engineering Hydrothermal Waves Zhong, Xin Duan, Fei Stable hydrothermal waves at steady state evaporating droplet surface |
| title | Stable hydrothermal waves at steady state evaporating droplet surface |
| title_full | Stable hydrothermal waves at steady state evaporating droplet surface |
| title_fullStr | Stable hydrothermal waves at steady state evaporating droplet surface |
| title_full_unstemmed | Stable hydrothermal waves at steady state evaporating droplet surface |
| title_short | Stable hydrothermal waves at steady state evaporating droplet surface |
| title_sort | stable hydrothermal waves at steady state evaporating droplet surface |
| topic | Evaporation DRNTU::Engineering::Mechanical engineering Hydrothermal Waves |
| url | https://hdl.handle.net/10356/88277 http://hdl.handle.net/10220/45673 |
| work_keys_str_mv | AT zhongxin stablehydrothermalwavesatsteadystateevaporatingdropletsurface AT duanfei stablehydrothermalwavesatsteadystateevaporatingdropletsurface |