Marangoni convection instabilities in an evaporating droplet on a non-isothermal substrate

The Marangoni convection instabilities are investigated in a sessile ethanol droplet as it evaporates on a non-isothermal substrate. The instability structures consistently, preferentially occur at the lower temperature side of substrate. Drifted by the azimuthal thermocapillary flow under externall...

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Main Authors: Wang, Tian-Shi, Shi, Wan-Yuan, Duan, Fei
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/161771
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1617712022-09-19T08:19:19Z Marangoni convection instabilities in an evaporating droplet on a non-isothermal substrate Wang, Tian-Shi Shi, Wan-Yuan Duan, Fei School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Marangoni Convection Evaporation The Marangoni convection instabilities are investigated in a sessile ethanol droplet as it evaporates on a non-isothermal substrate. The instability structures consistently, preferentially occur at the lower temperature side of substrate. Drifted by the azimuthal thermocapillary flow under externally imposed temperature gradient, the longitudinal rolls are found to propagate from the hot side to the cold side for the droplet, while a radial propagation of the BM cells directly from the cold side to the hot side along the droplet diameter occurs at the last period of evaporation process. The azimuthal propagation speed of longitudinal rolls increases with the increase of temperature gradient, but is independent of the mean temperature of the substrate. Effects of the mean temperature of substrate and the temperature gradient on the Marangoni instabilities are investigated, and the critical conditions for the onset of longitudinal rolls are determined. This work was supported by National Natural Science Foundation of China (No. 51676018). Thanks for the financial support from the program of China Scholarships Council (No. 202006050147). 2022-09-19T08:19:19Z 2022-09-19T08:19:19Z 2022 Journal Article Wang, T., Shi, W. & Duan, F. (2022). Marangoni convection instabilities in an evaporating droplet on a non-isothermal substrate. International Journal of Heat and Mass Transfer, 195, 123140-. https://dx.doi.org/10.1016/j.ijheatmasstransfer.2022.123140 0017-9310 https://hdl.handle.net/10356/161771 10.1016/j.ijheatmasstransfer.2022.123140 2-s2.0-85132385567 195 123140 en International Journal of Heat and Mass Transfer © 2022 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
Marangoni Convection
Evaporation
spellingShingle Engineering::Mechanical engineering
Marangoni Convection
Evaporation
Wang, Tian-Shi
Shi, Wan-Yuan
Duan, Fei
Marangoni convection instabilities in an evaporating droplet on a non-isothermal substrate
description The Marangoni convection instabilities are investigated in a sessile ethanol droplet as it evaporates on a non-isothermal substrate. The instability structures consistently, preferentially occur at the lower temperature side of substrate. Drifted by the azimuthal thermocapillary flow under externally imposed temperature gradient, the longitudinal rolls are found to propagate from the hot side to the cold side for the droplet, while a radial propagation of the BM cells directly from the cold side to the hot side along the droplet diameter occurs at the last period of evaporation process. The azimuthal propagation speed of longitudinal rolls increases with the increase of temperature gradient, but is independent of the mean temperature of the substrate. Effects of the mean temperature of substrate and the temperature gradient on the Marangoni instabilities are investigated, and the critical conditions for the onset of longitudinal rolls are determined.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Wang, Tian-Shi
Shi, Wan-Yuan
Duan, Fei
format Article
author Wang, Tian-Shi
Shi, Wan-Yuan
Duan, Fei
author_sort Wang, Tian-Shi
title Marangoni convection instabilities in an evaporating droplet on a non-isothermal substrate
title_short Marangoni convection instabilities in an evaporating droplet on a non-isothermal substrate
title_full Marangoni convection instabilities in an evaporating droplet on a non-isothermal substrate
title_fullStr Marangoni convection instabilities in an evaporating droplet on a non-isothermal substrate
title_full_unstemmed Marangoni convection instabilities in an evaporating droplet on a non-isothermal substrate
title_sort marangoni convection instabilities in an evaporating droplet on a non-isothermal substrate
publishDate 2022
url https://hdl.handle.net/10356/161771
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