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Microlayered flow structure around an acoustically levitated droplet under a phase-change process
The acoustic levitation method (ALM) has found extensive applications in the fields of materials science, analytical chemistry, and biomedicine. This paper describes an experimental investigation of a levitated droplet in a 19.4-kHz single-axis acoustic levitator. We used water, ethanol, water/ethan...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5515528/ https://www.ncbi.nlm.nih.gov/pubmed/28725723 http://dx.doi.org/10.1038/npjmgrav.2016.4 |
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author | Hasegawa, Koji Abe, Yutaka Goda, Atsushi |
author_facet | Hasegawa, Koji Abe, Yutaka Goda, Atsushi |
author_sort | Hasegawa, Koji |
collection | PubMed |
description | The acoustic levitation method (ALM) has found extensive applications in the fields of materials science, analytical chemistry, and biomedicine. This paper describes an experimental investigation of a levitated droplet in a 19.4-kHz single-axis acoustic levitator. We used water, ethanol, water/ethanol mixture, and hexane as test samples to investigate the effect of saturated vapor pressure on the flow field and evaporation process using a high-speed camera. In the case of ethanol, water/ethanol mixtures with initial ethanol fractions of 50 and 70 wt%, and hexane droplets, microlayered toroidal vortexes are generated in the vicinity of the droplet interface. Experimental results indicate the presence of two stages in the evaporation process of ethanol and binary mixture droplets for ethanol content >10%. The internal and external flow fields of the acoustically levitated droplet of pure and binary mixtures are clearly observed. The binary mixture of the levitated droplet shows the interaction between the configurations of the internal and external flow fields of the droplet and the concentration of the volatile fluid. Our findings can contribute to the further development of existing theoretical prediction. |
format | Online Article Text |
id | pubmed-5515528 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-55155282017-07-19 Microlayered flow structure around an acoustically levitated droplet under a phase-change process Hasegawa, Koji Abe, Yutaka Goda, Atsushi NPJ Microgravity Article The acoustic levitation method (ALM) has found extensive applications in the fields of materials science, analytical chemistry, and biomedicine. This paper describes an experimental investigation of a levitated droplet in a 19.4-kHz single-axis acoustic levitator. We used water, ethanol, water/ethanol mixture, and hexane as test samples to investigate the effect of saturated vapor pressure on the flow field and evaporation process using a high-speed camera. In the case of ethanol, water/ethanol mixtures with initial ethanol fractions of 50 and 70 wt%, and hexane droplets, microlayered toroidal vortexes are generated in the vicinity of the droplet interface. Experimental results indicate the presence of two stages in the evaporation process of ethanol and binary mixture droplets for ethanol content >10%. The internal and external flow fields of the acoustically levitated droplet of pure and binary mixtures are clearly observed. The binary mixture of the levitated droplet shows the interaction between the configurations of the internal and external flow fields of the droplet and the concentration of the volatile fluid. Our findings can contribute to the further development of existing theoretical prediction. Nature Publishing Group 2016-03-10 /pmc/articles/PMC5515528/ /pubmed/28725723 http://dx.doi.org/10.1038/npjmgrav.2016.4 Text en Copyright © 2016 Macmillan Publishers Limited http://creativecommons.org/licenses/by-nc-sa/4.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/ |
spellingShingle | Article Hasegawa, Koji Abe, Yutaka Goda, Atsushi Microlayered flow structure around an acoustically levitated droplet under a phase-change process |
title | Microlayered flow structure around an acoustically levitated droplet under a phase-change process |
title_full | Microlayered flow structure around an acoustically levitated droplet under a phase-change process |
title_fullStr | Microlayered flow structure around an acoustically levitated droplet under a phase-change process |
title_full_unstemmed | Microlayered flow structure around an acoustically levitated droplet under a phase-change process |
title_short | Microlayered flow structure around an acoustically levitated droplet under a phase-change process |
title_sort | microlayered flow structure around an acoustically levitated droplet under a phase-change process |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5515528/ https://www.ncbi.nlm.nih.gov/pubmed/28725723 http://dx.doi.org/10.1038/npjmgrav.2016.4 |
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