Impacting Droplet Can Mitigate Dust from PDMS Micro-Post Array Surfaces

In this paper, the impact mechanisms of a water droplet on hydrophobized micro-post array surfaces are examined and the influence of micro-post arrays spacing on the droplet behavior in terms of spreading, retraction, and rebounding is investigated. Impacting droplet behavior was recorded using a hi...

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Autores principales:	Abba Abdulhamid Abubakar, Bekir Sami Yilbas, Mubarak Yakubu, Hussain Al-Qahtani, Ghassan Hassan, Johnny Ebaika Adukwu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	micro-post arrays hydrophobic droplet impact dust mitigation Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/fd2e7ebabf3649029ad3e1d68b0946e2
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id	oai:doaj.org-article:fd2e7ebabf3649029ad3e1d68b0946e2
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spelling	oai:doaj.org-article:fd2e7ebabf3649029ad3e1d68b0946e22021-11-25T17:16:37ZImpacting Droplet Can Mitigate Dust from PDMS Micro-Post Array Surfaces10.3390/coatings111113772079-6412https://doaj.org/article/fd2e7ebabf3649029ad3e1d68b0946e22021-11-01T00:00:00Zhttps://www.mdpi.com/2079-6412/11/11/1377https://doaj.org/toc/2079-6412In this paper, the impact mechanisms of a water droplet on hydrophobized micro-post array surfaces are examined and the influence of micro-post arrays spacing on the droplet behavior in terms of spreading, retraction, and rebounding is investigated. Impacting droplet behavior was recorded using a high-speed facility and flow generated in the droplet fluid was simulated in 3D geometry accommodating conditions of the experiments. Micro-post arrays were initially formed lithographically on silicon wafer surfaces and, later, replicated by polydimethylsiloxane (PDMS). The replicated micro-post arrays surfaces were hydrophobized through coating by functionalized nano-silica particles. Hydrophobized surfaces result in a contact angle of 153° ± 3° with a hysteresis of 3° ± 1°. The predictions of the temporal behavior of droplet wetting diameter during spreading agree with the experimental data. Increasing micro-post arrays spacing reduces the maximum spreading diameter on the surface; in this case, droplet fluid penetrated micro-posts spacing creates a pinning effect while lowering droplet kinetic energy during the spreading cycle. Flow circulation results inside the droplet fluid in the edge region of the droplet during the spreading period; however, opposing flow occurs from the outer region towards the droplet center during the retraction cycle. This creates a stagnation zone in the central region of the droplet, which extends towards the droplet surface onset of droplet rebounding. Impacting droplet mitigates dust from hydrophobized micro-post array surfaces, and increasing droplet Weber number increases the area of dust mitigated from micro-post arrays surfaces.Abba Abdulhamid AbubakarBekir Sami YilbasMubarak YakubuHussain Al-QahtaniGhassan HassanJohnny Ebaika AdukwuMDPI AGarticlemicro-post arrayshydrophobicdroplet impactdust mitigationEngineering (General). Civil engineering (General)TA1-2040ENCoatings, Vol 11, Iss 1377, p 1377 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	micro-post arrays hydrophobic droplet impact dust mitigation Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	micro-post arrays hydrophobic droplet impact dust mitigation Engineering (General). Civil engineering (General) TA1-2040 Abba Abdulhamid Abubakar Bekir Sami Yilbas Mubarak Yakubu Hussain Al-Qahtani Ghassan Hassan Johnny Ebaika Adukwu Impacting Droplet Can Mitigate Dust from PDMS Micro-Post Array Surfaces
description	In this paper, the impact mechanisms of a water droplet on hydrophobized micro-post array surfaces are examined and the influence of micro-post arrays spacing on the droplet behavior in terms of spreading, retraction, and rebounding is investigated. Impacting droplet behavior was recorded using a high-speed facility and flow generated in the droplet fluid was simulated in 3D geometry accommodating conditions of the experiments. Micro-post arrays were initially formed lithographically on silicon wafer surfaces and, later, replicated by polydimethylsiloxane (PDMS). The replicated micro-post arrays surfaces were hydrophobized through coating by functionalized nano-silica particles. Hydrophobized surfaces result in a contact angle of 153° ± 3° with a hysteresis of 3° ± 1°. The predictions of the temporal behavior of droplet wetting diameter during spreading agree with the experimental data. Increasing micro-post arrays spacing reduces the maximum spreading diameter on the surface; in this case, droplet fluid penetrated micro-posts spacing creates a pinning effect while lowering droplet kinetic energy during the spreading cycle. Flow circulation results inside the droplet fluid in the edge region of the droplet during the spreading period; however, opposing flow occurs from the outer region towards the droplet center during the retraction cycle. This creates a stagnation zone in the central region of the droplet, which extends towards the droplet surface onset of droplet rebounding. Impacting droplet mitigates dust from hydrophobized micro-post array surfaces, and increasing droplet Weber number increases the area of dust mitigated from micro-post arrays surfaces.
format	article
author	Abba Abdulhamid Abubakar Bekir Sami Yilbas Mubarak Yakubu Hussain Al-Qahtani Ghassan Hassan Johnny Ebaika Adukwu
author_facet	Abba Abdulhamid Abubakar Bekir Sami Yilbas Mubarak Yakubu Hussain Al-Qahtani Ghassan Hassan Johnny Ebaika Adukwu
author_sort	Abba Abdulhamid Abubakar
title	Impacting Droplet Can Mitigate Dust from PDMS Micro-Post Array Surfaces
title_short	Impacting Droplet Can Mitigate Dust from PDMS Micro-Post Array Surfaces
title_full	Impacting Droplet Can Mitigate Dust from PDMS Micro-Post Array Surfaces
title_fullStr	Impacting Droplet Can Mitigate Dust from PDMS Micro-Post Array Surfaces
title_full_unstemmed	Impacting Droplet Can Mitigate Dust from PDMS Micro-Post Array Surfaces
title_sort	impacting droplet can mitigate dust from pdms micro-post array surfaces
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/fd2e7ebabf3649029ad3e1d68b0946e2
work_keys_str_mv	AT abbaabdulhamidabubakar impactingdropletcanmitigatedustfrompdmsmicropostarraysurfaces AT bekirsamiyilbas impactingdropletcanmitigatedustfrompdmsmicropostarraysurfaces AT mubarakyakubu impactingdropletcanmitigatedustfrompdmsmicropostarraysurfaces AT hussainalqahtani impactingdropletcanmitigatedustfrompdmsmicropostarraysurfaces AT ghassanhassan impactingdropletcanmitigatedustfrompdmsmicropostarraysurfaces AT johnnyebaikaadukwu impactingdropletcanmitigatedustfrompdmsmicropostarraysurfaces
_version_	1718412569270550528

Impacting Droplet Can Mitigate Dust from PDMS Micro-Post Array Surfaces

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