Dye visualization of the wake of a near-wall particle in response to a periodic oscillation
In turbulent dispersed multiphase flows, the interaction between the particle wake and the ambient turbulent fluctuation can be crucial for the change of the multiphase system. This issue is extremely complex due to the chaotic nature of the turbulence. In this paper, the ambient turbulent fluctuati...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2021-02-01
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| Series: | Measurement: Sensors |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2665917420300295 |
| _version_ | 1818971024395337728 |
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| author | Xing Li Haibin Zhang Bofeng Bai |
| author_facet | Xing Li Haibin Zhang Bofeng Bai |
| author_sort | Xing Li |
| collection | DOAJ |
| description | In turbulent dispersed multiphase flows, the interaction between the particle wake and the ambient turbulent fluctuation can be crucial for the change of the multiphase system. This issue is extremely complex due to the chaotic nature of the turbulence. In this paper, the ambient turbulent fluctuation of certain frequency is simulated by the Karman vortex street behind a horizontally placed cylinder, and the response of the wake of a stationary near-wall particle to the oncoming oscillation is investigated. The dye visualization is used to mark the vortex structures of the wake and the oncoming oscillation, respectively, and power spectrum analysis is conducted to reveal the features in the frequency domain. Results show that at relatively low Rep, the oncoming oscillation has little effect on the wake. As Rep increases, the response of the wake to the oncoming oscillation is evident. High-frequency fluctuation dissipates very fast and only exists near the particle. On the contrary, the life span of the low-frequency fluctuation lasts for a much longer period and exists far downstream. In addition, the self-induced vortex shedding is not notable and is overwhelmed by the oncoming oscillation. |
| first_indexed | 2024-12-20T14:45:48Z |
| format | Article |
| id | doaj.art-942a5d7ae77b442aaf158938f2090684 |
| institution | Directory Open Access Journal |
| issn | 2665-9174 |
| language | English |
| last_indexed | 2024-12-20T14:45:48Z |
| publishDate | 2021-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Measurement: Sensors |
| spelling | doaj.art-942a5d7ae77b442aaf158938f20906842022-12-21T19:37:08ZengElsevierMeasurement: Sensors2665-91742021-02-0113100032Dye visualization of the wake of a near-wall particle in response to a periodic oscillationXing Li0Haibin Zhang1Bofeng Bai2State Key Laboratory of Multiphase Flow in Power Engineering, School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, ChinaState Key Laboratory of Multiphase Flow in Power Engineering, School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, ChinaCorresponding author.; State Key Laboratory of Multiphase Flow in Power Engineering, School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, ChinaIn turbulent dispersed multiphase flows, the interaction between the particle wake and the ambient turbulent fluctuation can be crucial for the change of the multiphase system. This issue is extremely complex due to the chaotic nature of the turbulence. In this paper, the ambient turbulent fluctuation of certain frequency is simulated by the Karman vortex street behind a horizontally placed cylinder, and the response of the wake of a stationary near-wall particle to the oncoming oscillation is investigated. The dye visualization is used to mark the vortex structures of the wake and the oncoming oscillation, respectively, and power spectrum analysis is conducted to reveal the features in the frequency domain. Results show that at relatively low Rep, the oncoming oscillation has little effect on the wake. As Rep increases, the response of the wake to the oncoming oscillation is evident. High-frequency fluctuation dissipates very fast and only exists near the particle. On the contrary, the life span of the low-frequency fluctuation lasts for a much longer period and exists far downstream. In addition, the self-induced vortex shedding is not notable and is overwhelmed by the oncoming oscillation.http://www.sciencedirect.com/science/article/pii/S2665917420300295Dye visualizationParticle wakeTurbulence |
| spellingShingle | Xing Li Haibin Zhang Bofeng Bai Dye visualization of the wake of a near-wall particle in response to a periodic oscillation Measurement: Sensors Dye visualization Particle wake Turbulence |
| title | Dye visualization of the wake of a near-wall particle in response to a periodic oscillation |
| title_full | Dye visualization of the wake of a near-wall particle in response to a periodic oscillation |
| title_fullStr | Dye visualization of the wake of a near-wall particle in response to a periodic oscillation |
| title_full_unstemmed | Dye visualization of the wake of a near-wall particle in response to a periodic oscillation |
| title_short | Dye visualization of the wake of a near-wall particle in response to a periodic oscillation |
| title_sort | dye visualization of the wake of a near wall particle in response to a periodic oscillation |
| topic | Dye visualization Particle wake Turbulence |
| url | http://www.sciencedirect.com/science/article/pii/S2665917420300295 |
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