Fluid-Flow Analysis for a Novel Cylindrical Micromixer
Through computational fluid dynamics (CFD) and experiments, we studied the spiral flow and mixing process inside a novel cylindrical micromixer. Because mixing efficiency is generally poor in microflows, we expected spiral flow to enhance mixing. Parametric studies evaluated mixing efficiency in ter...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
The Japan Society of Mechanical Engineers
2011-03-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/6/2/6_2_230/_pdf/-char/en |
| _version_ | 1798020935845937152 |
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| author | Yoshiyuki MITSUHASHI Ken YAMAZAKI Eiichiro KOBAYASHI Akira YONEYA Naoki ONO |
| author_facet | Yoshiyuki MITSUHASHI Ken YAMAZAKI Eiichiro KOBAYASHI Akira YONEYA Naoki ONO |
| author_sort | Yoshiyuki MITSUHASHI |
| collection | DOAJ |
| description | Through computational fluid dynamics (CFD) and experiments, we studied the spiral flow and mixing process inside a novel cylindrical micromixer. Because mixing efficiency is generally poor in microflows, we expected spiral flow to enhance mixing. Parametric studies evaluated mixing efficiency in terms of flow rate and outer cylinder diameter (i.e., channel width). The patterns of streamlines and the concentration distribution obtained by CFD simulations agreed well with those obtained experimentally by flow observation and concentration measurements. Moreover, we found that the mixing efficiency was strongly influenced by the number of revolutions of the spiral flow. To predict the number of revolutions, we propose a simple equation derived by considering friction forces and angular momentum balance. Consequently, we found that when the distance between the inner and outer cylinders and/or the flow rate was increased, the number of revolutions in the spiral flow increased, which resulted in an enhanced mixing efficiency. |
| first_indexed | 2024-04-11T17:05:47Z |
| format | Article |
| id | doaj.art-6ae1aeed78cb4a28867a2db42dfffcf4 |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-04-11T17:05:47Z |
| publishDate | 2011-03-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-6ae1aeed78cb4a28867a2db42dfffcf42022-12-22T04:13:01ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582011-03-016223024110.1299/jfst.6.230jfstFluid-Flow Analysis for a Novel Cylindrical MicromixerYoshiyuki MITSUHASHI0Ken YAMAZAKI1Eiichiro KOBAYASHI2Akira YONEYA3Naoki ONO4Department of Engineering Science and Mechanics, Shibaura Institute of TechnologyDepartment of Engineering Science and Mechanics, Shibaura Institute of TechnologyNisso Engineering Co., Ltd.Nisso Engineering Co., Ltd.Department of Engineering Science and Mechanics, Shibaura Institute of TechnologyThrough computational fluid dynamics (CFD) and experiments, we studied the spiral flow and mixing process inside a novel cylindrical micromixer. Because mixing efficiency is generally poor in microflows, we expected spiral flow to enhance mixing. Parametric studies evaluated mixing efficiency in terms of flow rate and outer cylinder diameter (i.e., channel width). The patterns of streamlines and the concentration distribution obtained by CFD simulations agreed well with those obtained experimentally by flow observation and concentration measurements. Moreover, we found that the mixing efficiency was strongly influenced by the number of revolutions of the spiral flow. To predict the number of revolutions, we propose a simple equation derived by considering friction forces and angular momentum balance. Consequently, we found that when the distance between the inner and outer cylinders and/or the flow rate was increased, the number of revolutions in the spiral flow increased, which resulted in an enhanced mixing efficiency.https://www.jstage.jst.go.jp/article/jfst/6/2/6_2_230/_pdf/-char/encylindrical micromixerlaminar flowspiral flowcfdmixing efficiencynacl concentration |
| spellingShingle | Yoshiyuki MITSUHASHI Ken YAMAZAKI Eiichiro KOBAYASHI Akira YONEYA Naoki ONO Fluid-Flow Analysis for a Novel Cylindrical Micromixer Journal of Fluid Science and Technology cylindrical micromixer laminar flow spiral flow cfd mixing efficiency nacl concentration |
| title | Fluid-Flow Analysis for a Novel Cylindrical Micromixer |
| title_full | Fluid-Flow Analysis for a Novel Cylindrical Micromixer |
| title_fullStr | Fluid-Flow Analysis for a Novel Cylindrical Micromixer |
| title_full_unstemmed | Fluid-Flow Analysis for a Novel Cylindrical Micromixer |
| title_short | Fluid-Flow Analysis for a Novel Cylindrical Micromixer |
| title_sort | fluid flow analysis for a novel cylindrical micromixer |
| topic | cylindrical micromixer laminar flow spiral flow cfd mixing efficiency nacl concentration |
| url | https://www.jstage.jst.go.jp/article/jfst/6/2/6_2_230/_pdf/-char/en |
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