Wetting phenomena observed in evaporating droplets on structured surfaces

Revekka Tekidou; Gail Duursma; Coinneach Mackenzie-Dover; Veronika Kubyshkina; Jonathan Terry; Khellil Sefiane

doi:10.1080/01457632.2019.1640450

Wetting phenomena observed in evaporating droplets on structured surfaces

Revekka Tekidou, Gail Duursma, Coinneach Mackenzie-Dover, Veronika Kubyshkina, Jonathan Terry, Khellil Sefiane

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

A study was undertaken of ethanol droplet evaporation on structured surfaces of pillars (square pillars of variable dimensions and spacing of order microns, and cylindrical of various spacings). On seasoned perflourodecyltrichlorosilane surfaces, significant films were observed extending far beyond the initial contact line for pure ethanol droplets, most prominently for 4 microlitre droplets. On parylene coated surfaces, similar imbibed films were seen for 1.5 microlitre droplets of 50% by volume ethanol-water mixture. This film acts as an additional surface for evaporation and it appears that the droplet then serves as a reservoir for feeding the film until the evaporation process is completed, rather than evaporation being governed by evaporation at the contact line. The droplets with films show higher evaporation rates.

Original language	English (US)
Pages (from-to)	1645-1653
Number of pages	9
Journal	Heat Transfer Engineering
Volume	41
Issue number	19-20
DOIs	https://doi.org/10.1080/01457632.2019.1640450
State	Published - Nov 12 2020
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2019 Taylor & Francis Group, LLC.

Keywords

Wetting
droplet evaporation
structured surfaces

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1080/01457632.2019.1640450

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title = "Wetting phenomena observed in evaporating droplets on structured surfaces",

abstract = "A study was undertaken of ethanol droplet evaporation on structured surfaces of pillars (square pillars of variable dimensions and spacing of order microns, and cylindrical of various spacings). On seasoned perflourodecyltrichlorosilane surfaces, significant films were observed extending far beyond the initial contact line for pure ethanol droplets, most prominently for 4 microlitre droplets. On parylene coated surfaces, similar imbibed films were seen for 1.5 microlitre droplets of 50% by volume ethanol-water mixture. This film acts as an additional surface for evaporation and it appears that the droplet then serves as a reservoir for feeding the film until the evaporation process is completed, rather than evaporation being governed by evaporation at the contact line. The droplets with films show higher evaporation rates.",

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T1 - Wetting phenomena observed in evaporating droplets on structured surfaces

AU - Tekidou, Revekka

AU - Duursma, Gail

AU - Mackenzie-Dover, Coinneach

AU - Kubyshkina, Veronika

AU - Terry, Jonathan

AU - Sefiane, Khellil

PY - 2020/11/12

Y1 - 2020/11/12

N2 - A study was undertaken of ethanol droplet evaporation on structured surfaces of pillars (square pillars of variable dimensions and spacing of order microns, and cylindrical of various spacings). On seasoned perflourodecyltrichlorosilane surfaces, significant films were observed extending far beyond the initial contact line for pure ethanol droplets, most prominently for 4 microlitre droplets. On parylene coated surfaces, similar imbibed films were seen for 1.5 microlitre droplets of 50% by volume ethanol-water mixture. This film acts as an additional surface for evaporation and it appears that the droplet then serves as a reservoir for feeding the film until the evaporation process is completed, rather than evaporation being governed by evaporation at the contact line. The droplets with films show higher evaporation rates.

AB - A study was undertaken of ethanol droplet evaporation on structured surfaces of pillars (square pillars of variable dimensions and spacing of order microns, and cylindrical of various spacings). On seasoned perflourodecyltrichlorosilane surfaces, significant films were observed extending far beyond the initial contact line for pure ethanol droplets, most prominently for 4 microlitre droplets. On parylene coated surfaces, similar imbibed films were seen for 1.5 microlitre droplets of 50% by volume ethanol-water mixture. This film acts as an additional surface for evaporation and it appears that the droplet then serves as a reservoir for feeding the film until the evaporation process is completed, rather than evaporation being governed by evaporation at the contact line. The droplets with films show higher evaporation rates.

KW - Wetting

KW - droplet evaporation

KW - structured surfaces

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Wetting phenomena observed in evaporating droplets on structured surfaces

Abstract

Bibliographical note

Keywords

UN SDGs

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