An investigation into a micro-sized droplet impinging on a surface with sharp wettability contrast

An experimental investigation was conducted into a micro-sized droplet jetted onto a surface with sharp wettability contrast. The dynamics of micro-sized droplet impingement on a sharp wettability contrast surface, which is critical in inkjet printing technology, has not been investigated in the lit...

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Main Authors: Lam, Yee Cheong, Lim, Chun Yee
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2015
Subjects:
Online Access:https://hdl.handle.net/10356/107212
http://hdl.handle.net/10220/25334
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1072122023-03-04T17:17:51Z An investigation into a micro-sized droplet impinging on a surface with sharp wettability contrast Lam, Yee Cheong Lim, Chun Yee School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering::Fluid mechanics An experimental investigation was conducted into a micro-sized droplet jetted onto a surface with sharp wettability contrast. The dynamics of micro-sized droplet impingement on a sharp wettability contrast surface, which is critical in inkjet printing technology, has not been investigated in the literature. Hydrophilic lines with line widths ranging from 27 to 53 µm, and contact angle ranging from 17° to 77°, were patterned on a hydrophobic surface with a contact angle of 107°. Water droplets with a diameter of 81 µm were impinged at various offset distances from the centre of the hydrophilic line. The evolution of the droplet upon impingement can be divided into three distinct phases, namely the kinematic phase, the translating phase where the droplet moves towards the centre of the hydrophilic line, and the conforming phase where the droplet spreads along the line. The key parameters affecting the conformability of the droplet to the hydrophilic line pattern are the ratio of the line width to the initial droplet diameter and the contact angle of the hydrophilic line. The droplet will only conform completely to the hydrophilic pattern if the line width is not overly small relative to the droplet and the contact angle of the hydrophilic line is sufficiently low. The impact offset distance does not affect the final shape and final location of the droplet, as long as part of the droplet touches the hydrophilic line upon impingement. This process has a significant impact on inkjet printing technology as high accuracy of inkjet droplet deposition and shape control can be achieved through wettability patterning. ASTAR (Agency for Sci., Tech. and Research, S’pore) Accepted version 2015-04-07T08:38:35Z 2019-12-06T22:26:48Z 2015-04-07T08:38:35Z 2019-12-06T22:26:48Z 2014 2014 Journal Article Lim, C. Y., & Lam, Y. C. (2014). An investigation into a micro-sized droplet impinging on a surface with sharp wettability contrast. Journal of Physics D : applied physics, 47. https://hdl.handle.net/10356/107212 http://hdl.handle.net/10220/25334 10.1088/0022-3727/47/42/425305 184338 en Journal of Physics D : applied physics © 2014 IOP Publishing Ltd. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Physics D: Applied Physics, IOP Publishing Ltd. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1088/0022-3727/47/42/425305]. application/msword
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering::Fluid mechanics
spellingShingle DRNTU::Engineering::Mechanical engineering::Fluid mechanics
Lam, Yee Cheong
Lim, Chun Yee
An investigation into a micro-sized droplet impinging on a surface with sharp wettability contrast
description An experimental investigation was conducted into a micro-sized droplet jetted onto a surface with sharp wettability contrast. The dynamics of micro-sized droplet impingement on a sharp wettability contrast surface, which is critical in inkjet printing technology, has not been investigated in the literature. Hydrophilic lines with line widths ranging from 27 to 53 µm, and contact angle ranging from 17° to 77°, were patterned on a hydrophobic surface with a contact angle of 107°. Water droplets with a diameter of 81 µm were impinged at various offset distances from the centre of the hydrophilic line. The evolution of the droplet upon impingement can be divided into three distinct phases, namely the kinematic phase, the translating phase where the droplet moves towards the centre of the hydrophilic line, and the conforming phase where the droplet spreads along the line. The key parameters affecting the conformability of the droplet to the hydrophilic line pattern are the ratio of the line width to the initial droplet diameter and the contact angle of the hydrophilic line. The droplet will only conform completely to the hydrophilic pattern if the line width is not overly small relative to the droplet and the contact angle of the hydrophilic line is sufficiently low. The impact offset distance does not affect the final shape and final location of the droplet, as long as part of the droplet touches the hydrophilic line upon impingement. This process has a significant impact on inkjet printing technology as high accuracy of inkjet droplet deposition and shape control can be achieved through wettability patterning.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Lam, Yee Cheong
Lim, Chun Yee
format Article
author Lam, Yee Cheong
Lim, Chun Yee
author_sort Lam, Yee Cheong
title An investigation into a micro-sized droplet impinging on a surface with sharp wettability contrast
title_short An investigation into a micro-sized droplet impinging on a surface with sharp wettability contrast
title_full An investigation into a micro-sized droplet impinging on a surface with sharp wettability contrast
title_fullStr An investigation into a micro-sized droplet impinging on a surface with sharp wettability contrast
title_full_unstemmed An investigation into a micro-sized droplet impinging on a surface with sharp wettability contrast
title_sort investigation into a micro-sized droplet impinging on a surface with sharp wettability contrast
publishDate 2015
url https://hdl.handle.net/10356/107212
http://hdl.handle.net/10220/25334
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