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The effect of femtosecond laser fluence and pitches between V-shaped microgrooves on the dynamics of capillary flow

Open microgroove is one kind of capillary-driven superwicking surface structure. In this study, arrays of parallel V-shaped microgrooves were fabricated on an aluminum surface by using a femtosecond laser to obtain a superwicking surface which can quickly transport the water uphill against gravity....

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Detalles Bibliográficos
Autores principales: Xie, Fei, Yang, Jianjun, Ngo, Chi-Vinh
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7762841/
https://www.ncbi.nlm.nih.gov/pubmed/33381391
http://dx.doi.org/10.1016/j.rinp.2020.103606
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author Xie, Fei
Yang, Jianjun
Ngo, Chi-Vinh
author_facet Xie, Fei
Yang, Jianjun
Ngo, Chi-Vinh
author_sort Xie, Fei
collection PubMed
description Open microgroove is one kind of capillary-driven superwicking surface structure. In this study, arrays of parallel V-shaped microgrooves were fabricated on an aluminum surface by using a femtosecond laser to obtain a superwicking surface which can quickly transport the water uphill against gravity. The relationships between the flowing time and flowing distance were investigated and compared with theoretical results. We demonstrated both laser fluence and scanning step size can affect the superwicking performance. The aluminum surfaces fabricated at a laser fluence of 18.49 J/cm(2) and 52.67 J/cm(2) showed the best superwicking performances with the average water flow velocities approximately 16.2 mm/s and 16.4 mm/s, respectively, in the distance of 30 mm. On the other hand, the superwicking surfaces show an anisotropic flow characteristic due to the parallel microgrooves structure. However, when the scanning step size drops to 25 µm, the surface will form irregular rough structures that result in the isotropic flow characteristics. Moreover, by using a thermal camera, we found that after a 10 µL water droplet was dropped into the heated surface, the superwicking surface temperature quickly dropped from 92.4 °C to 82.5 °C which indicated that laser processing of the superwicking surface has potential application in heat dissipation.
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spelling pubmed-77628412020-12-28 The effect of femtosecond laser fluence and pitches between V-shaped microgrooves on the dynamics of capillary flow Xie, Fei Yang, Jianjun Ngo, Chi-Vinh Results Phys Article Open microgroove is one kind of capillary-driven superwicking surface structure. In this study, arrays of parallel V-shaped microgrooves were fabricated on an aluminum surface by using a femtosecond laser to obtain a superwicking surface which can quickly transport the water uphill against gravity. The relationships between the flowing time and flowing distance were investigated and compared with theoretical results. We demonstrated both laser fluence and scanning step size can affect the superwicking performance. The aluminum surfaces fabricated at a laser fluence of 18.49 J/cm(2) and 52.67 J/cm(2) showed the best superwicking performances with the average water flow velocities approximately 16.2 mm/s and 16.4 mm/s, respectively, in the distance of 30 mm. On the other hand, the superwicking surfaces show an anisotropic flow characteristic due to the parallel microgrooves structure. However, when the scanning step size drops to 25 µm, the surface will form irregular rough structures that result in the isotropic flow characteristics. Moreover, by using a thermal camera, we found that after a 10 µL water droplet was dropped into the heated surface, the superwicking surface temperature quickly dropped from 92.4 °C to 82.5 °C which indicated that laser processing of the superwicking surface has potential application in heat dissipation. Elsevier 2020-12 /pmc/articles/PMC7762841/ /pubmed/33381391 http://dx.doi.org/10.1016/j.rinp.2020.103606 Text en © 2020 The Author(s) http://creativecommons.org/licenses/by/4.0/ This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Xie, Fei
Yang, Jianjun
Ngo, Chi-Vinh
The effect of femtosecond laser fluence and pitches between V-shaped microgrooves on the dynamics of capillary flow
title The effect of femtosecond laser fluence and pitches between V-shaped microgrooves on the dynamics of capillary flow
title_full The effect of femtosecond laser fluence and pitches between V-shaped microgrooves on the dynamics of capillary flow
title_fullStr The effect of femtosecond laser fluence and pitches between V-shaped microgrooves on the dynamics of capillary flow
title_full_unstemmed The effect of femtosecond laser fluence and pitches between V-shaped microgrooves on the dynamics of capillary flow
title_short The effect of femtosecond laser fluence and pitches between V-shaped microgrooves on the dynamics of capillary flow
title_sort effect of femtosecond laser fluence and pitches between v-shaped microgrooves on the dynamics of capillary flow
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7762841/
https://www.ncbi.nlm.nih.gov/pubmed/33381391
http://dx.doi.org/10.1016/j.rinp.2020.103606
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