Numerical Study of Nanoparticle Deposition in a Gaseous Microchannel under the Influence of Various Forces
Nanoparticle deposition in microchannel devices inducing contaminant clogging is a serious barrier to the application of micro-electro-mechanical systems (MEMS). For micro-scale gas flow fields with a high Knudsen number (<i>Kn</i>) in the microchannel, gas rarefaction and velocity slip...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-01-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/12/1/47 |
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| author | Fubing Bao Hanbo Hao Zhaoqin Yin Chengxu Tu |
| author_facet | Fubing Bao Hanbo Hao Zhaoqin Yin Chengxu Tu |
| author_sort | Fubing Bao |
| collection | DOAJ |
| description | Nanoparticle deposition in microchannel devices inducing contaminant clogging is a serious barrier to the application of micro-electro-mechanical systems (MEMS). For micro-scale gas flow fields with a high Knudsen number (<i>Kn</i>) in the microchannel, gas rarefaction and velocity slip cannot be ignored. Furthermore, the mechanism of nanoparticle transport and deposition in the microchannel is extremely complex. In this study, the compressible gas model and a second-order slip boundary condition have been applied to the Burnett equations to solve the flow field issue in a microchannel. Drag, Brownian, and thermophoretic forces are concerned in the motion equations of particles. A series of numerical simulations for various particle sizes, flow rates, and temperature gradients have been performed. Some important features such as reasons, efficiencies, and locations of particle deposition have been explored. The results indicate that the particle deposition efficiency varies more or less under the actions of forces such as Brownian force, thermophoretic force, and drag force. Nevertheless, different forces lead to different particle motions and deposition processes. Brownian or thermophoretic force causes particles to move closer to the wall or further away from it. The drag force influence of slip boundary conditions and gas rarefaction changes the particles’ residential time in the channel. In order to find a way to decrease particle deposition on the microchannel surface, the deposition locations of different sizes of particles have been analyzed in detail under the action of thermophoretic force. |
| first_indexed | 2024-03-10T13:32:32Z |
| format | Article |
| id | doaj.art-056468baf9834aadb1f259f362feab5a |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-10T13:32:32Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-056468baf9834aadb1f259f362feab5a2023-11-21T07:44:27ZengMDPI AGMicromachines2072-666X2021-01-011214710.3390/mi12010047Numerical Study of Nanoparticle Deposition in a Gaseous Microchannel under the Influence of Various ForcesFubing Bao0Hanbo Hao1Zhaoqin Yin2Chengxu Tu3Institute of Fluid Measurement and Simulation, China Jiliang University, Hangzhou 310018, ChinaInstitute of Fluid Measurement and Simulation, China Jiliang University, Hangzhou 310018, ChinaInstitute of Fluid Measurement and Simulation, China Jiliang University, Hangzhou 310018, ChinaInstitute of Fluid Measurement and Simulation, China Jiliang University, Hangzhou 310018, ChinaNanoparticle deposition in microchannel devices inducing contaminant clogging is a serious barrier to the application of micro-electro-mechanical systems (MEMS). For micro-scale gas flow fields with a high Knudsen number (<i>Kn</i>) in the microchannel, gas rarefaction and velocity slip cannot be ignored. Furthermore, the mechanism of nanoparticle transport and deposition in the microchannel is extremely complex. In this study, the compressible gas model and a second-order slip boundary condition have been applied to the Burnett equations to solve the flow field issue in a microchannel. Drag, Brownian, and thermophoretic forces are concerned in the motion equations of particles. A series of numerical simulations for various particle sizes, flow rates, and temperature gradients have been performed. Some important features such as reasons, efficiencies, and locations of particle deposition have been explored. The results indicate that the particle deposition efficiency varies more or less under the actions of forces such as Brownian force, thermophoretic force, and drag force. Nevertheless, different forces lead to different particle motions and deposition processes. Brownian or thermophoretic force causes particles to move closer to the wall or further away from it. The drag force influence of slip boundary conditions and gas rarefaction changes the particles’ residential time in the channel. In order to find a way to decrease particle deposition on the microchannel surface, the deposition locations of different sizes of particles have been analyzed in detail under the action of thermophoretic force.https://www.mdpi.com/2072-666X/12/1/47microchannel flowrarefied gasnanoparticles depositionthermophoresisBrownian force |
| spellingShingle | Fubing Bao Hanbo Hao Zhaoqin Yin Chengxu Tu Numerical Study of Nanoparticle Deposition in a Gaseous Microchannel under the Influence of Various Forces Micromachines microchannel flow rarefied gas nanoparticles deposition thermophoresis Brownian force |
| title | Numerical Study of Nanoparticle Deposition in a Gaseous Microchannel under the Influence of Various Forces |
| title_full | Numerical Study of Nanoparticle Deposition in a Gaseous Microchannel under the Influence of Various Forces |
| title_fullStr | Numerical Study of Nanoparticle Deposition in a Gaseous Microchannel under the Influence of Various Forces |
| title_full_unstemmed | Numerical Study of Nanoparticle Deposition in a Gaseous Microchannel under the Influence of Various Forces |
| title_short | Numerical Study of Nanoparticle Deposition in a Gaseous Microchannel under the Influence of Various Forces |
| title_sort | numerical study of nanoparticle deposition in a gaseous microchannel under the influence of various forces |
| topic | microchannel flow rarefied gas nanoparticles deposition thermophoresis Brownian force |
| url | https://www.mdpi.com/2072-666X/12/1/47 |
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