Transition Routes of Electrokinetic Flow in a Divergent Microchannel with Bending Walls
Electrokinetic flow can be generated as a highly coupled phenomenon among velocity fields, electric conductivity fields, and electric fields. It can exhibit different responses to AC electric fields in different frequency regimes, according to different instability/receptivity mechanisms. In this in...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-02-01
|
| Series: | Micromachines |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2072-666X/14/2/474 |
| _version_ | 1797619236717199360 |
|---|---|
| author | Yanxia Shi Ming Zeng Haoxin Bai Shuangshuang Meng Chen Zhang Xiaoqiang Feng Ce Zhang Kaige Wang Wei Zhao |
| author_facet | Yanxia Shi Ming Zeng Haoxin Bai Shuangshuang Meng Chen Zhang Xiaoqiang Feng Ce Zhang Kaige Wang Wei Zhao |
| author_sort | Yanxia Shi |
| collection | DOAJ |
| description | Electrokinetic flow can be generated as a highly coupled phenomenon among velocity fields, electric conductivity fields, and electric fields. It can exhibit different responses to AC electric fields in different frequency regimes, according to different instability/receptivity mechanisms. In this investigation, by both flow visualization and single-point laser-induced fluorescence (LIF) method, the response of AC electrokinetic flow and the transition routes towards chaos and turbulence have been experimentally investigated. It is found, when the AC frequency <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>f</mi><mi>f</mi></msub><mo>></mo><mn>30</mn></mrow></semantics></math></inline-formula> Hz, the interface responds at both the neutral frequency of the basic flow and the AC frequency. However, when <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>f</mi><mi>f</mi></msub><mo>≥</mo><mn>30</mn></mrow></semantics></math></inline-formula> Hz, the interface responds only at the neutral frequency of the basic flow. Both periodic doubling and subcritical bifurcations have been observed in the transition of AC electrokinetic flow. We hope the current investigation can promote our current understanding of the ultrafast transition process of electrokinetic flow from laminar state to turbulence. |
| first_indexed | 2024-03-11T08:24:16Z |
| format | Article |
| id | doaj.art-6ffa73f5e7194e2aa2e430e8ae3efa6d |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-11T08:24:16Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-6ffa73f5e7194e2aa2e430e8ae3efa6d2023-11-16T22:12:45ZengMDPI AGMicromachines2072-666X2023-02-0114247410.3390/mi14020474Transition Routes of Electrokinetic Flow in a Divergent Microchannel with Bending WallsYanxia Shi0Ming Zeng1Haoxin Bai2Shuangshuang Meng3Chen Zhang4Xiaoqiang Feng5Ce Zhang6Kaige Wang7Wei Zhao8State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi’an 710127, ChinaState Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi’an 710127, ChinaState Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi’an 710127, ChinaState Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi’an 710127, ChinaState Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi’an 710127, ChinaState Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi’an 710127, ChinaState Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi’an 710127, ChinaState Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi’an 710127, ChinaState Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwest University, Xi’an 710127, ChinaElectrokinetic flow can be generated as a highly coupled phenomenon among velocity fields, electric conductivity fields, and electric fields. It can exhibit different responses to AC electric fields in different frequency regimes, according to different instability/receptivity mechanisms. In this investigation, by both flow visualization and single-point laser-induced fluorescence (LIF) method, the response of AC electrokinetic flow and the transition routes towards chaos and turbulence have been experimentally investigated. It is found, when the AC frequency <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>f</mi><mi>f</mi></msub><mo>></mo><mn>30</mn></mrow></semantics></math></inline-formula> Hz, the interface responds at both the neutral frequency of the basic flow and the AC frequency. However, when <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>f</mi><mi>f</mi></msub><mo>≥</mo><mn>30</mn></mrow></semantics></math></inline-formula> Hz, the interface responds only at the neutral frequency of the basic flow. Both periodic doubling and subcritical bifurcations have been observed in the transition of AC electrokinetic flow. We hope the current investigation can promote our current understanding of the ultrafast transition process of electrokinetic flow from laminar state to turbulence.https://www.mdpi.com/2072-666X/14/2/474electrokinetic instability (EKI)power spectrumresponse frequencysingle-point laser-induced fluorescence (LIF) |
| spellingShingle | Yanxia Shi Ming Zeng Haoxin Bai Shuangshuang Meng Chen Zhang Xiaoqiang Feng Ce Zhang Kaige Wang Wei Zhao Transition Routes of Electrokinetic Flow in a Divergent Microchannel with Bending Walls Micromachines electrokinetic instability (EKI) power spectrum response frequency single-point laser-induced fluorescence (LIF) |
| title | Transition Routes of Electrokinetic Flow in a Divergent Microchannel with Bending Walls |
| title_full | Transition Routes of Electrokinetic Flow in a Divergent Microchannel with Bending Walls |
| title_fullStr | Transition Routes of Electrokinetic Flow in a Divergent Microchannel with Bending Walls |
| title_full_unstemmed | Transition Routes of Electrokinetic Flow in a Divergent Microchannel with Bending Walls |
| title_short | Transition Routes of Electrokinetic Flow in a Divergent Microchannel with Bending Walls |
| title_sort | transition routes of electrokinetic flow in a divergent microchannel with bending walls |
| topic | electrokinetic instability (EKI) power spectrum response frequency single-point laser-induced fluorescence (LIF) |
| url | https://www.mdpi.com/2072-666X/14/2/474 |
| work_keys_str_mv | AT yanxiashi transitionroutesofelectrokineticflowinadivergentmicrochannelwithbendingwalls AT mingzeng transitionroutesofelectrokineticflowinadivergentmicrochannelwithbendingwalls AT haoxinbai transitionroutesofelectrokineticflowinadivergentmicrochannelwithbendingwalls AT shuangshuangmeng transitionroutesofelectrokineticflowinadivergentmicrochannelwithbendingwalls AT chenzhang transitionroutesofelectrokineticflowinadivergentmicrochannelwithbendingwalls AT xiaoqiangfeng transitionroutesofelectrokineticflowinadivergentmicrochannelwithbendingwalls AT cezhang transitionroutesofelectrokineticflowinadivergentmicrochannelwithbendingwalls AT kaigewang transitionroutesofelectrokineticflowinadivergentmicrochannelwithbendingwalls AT weizhao transitionroutesofelectrokineticflowinadivergentmicrochannelwithbendingwalls |