| Negative Knudsen force on heated microbeams |
| Zhu TS; Ye WJ; Zhang J(张俊) ; Zhu, TS (reprint author), Hong Kong Univ Sci & Technol, Dept Mech Engn, Hong Kong, Hong Kong, Peoples R China
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| 发表期刊 | Physical Review E
 |
| 2011
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| 卷号 | 84期号:5页码:56316 |
| ISSN | 1539-3755
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| 摘要 | Knudsen force acting on a heated microbeam adjacent to a cold substrate in a rarefied gas is a mechanical force created by unbalanced thermal gradients. The measured force has its direction pointing towards the side with a lower thermal gradient and its magnitude vanishes in both continuum and free-molecule limits. In our previous study, negative Knudsen forces were discovered at the high Knudsen regime before diminishing in the free-molecule limit. Such a phenomenon was, however, neither observed in experiment [A. Passian et al., Phys. Rev. Lett. 90, 124503 (2003)], nor captured in the latest numerical study [J. Nabeth et al., Phys. Rev. E 83, 066306 (2011)]. In this paper, the existence of such a negative Knudsen force is further confirmed using both numerical simulation and theoretical analysis. The asymptotic order of the Knudsen force near the collisionless limit is analyzed and the analytical expression of its leading term is provided, from which approaches for the enhancement of negative Knudsen forces are proposed. The discovered phenomenon could find its applications in novel mechanisms for pressure sensing and actuation. |
| 关键词 | Boltzmann-equation
Spherical-particle
Numerical-analysis
Rarefied-gas
Thermophoresis
Pressure
Model
Flow
|
| 学科领域 | Physics
|
| DOI | 10.1103/PhysRevE.84.056316
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| URL | 查看原文
|
| 收录类别 | SCI
; EI
|
| 语种 | 英语
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| WOS记录号 | WOS:000297467300007
|
| 关键词[WOS] | BOLTZMANN-EQUATION
; SPHERICAL-PARTICLE
; NUMERICAL-ANALYSIS
; RAREFIED-GAS
; THERMOPHORESIS
; PRESSURE
; MODEL
; FLOW
|
| WOS研究方向 | Physics
|
| WOS类目 | Physics, Fluids & Plasmas
; Physics, Mathematical
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| 项目资助者 | This work is supported in part by Award No. SA-C0040/UK-C0016, made by King Abdullah University of Science and Technology, and in part by Hong Kong Research Grants Council under Competitive Earmarked Research Grant No. 621408.
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| 课题组名称 | LHD微尺度和非平衡流动
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| 论文分区 | 一类
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/45180
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| 专题 | 高温气体动力学国家重点实验室
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| 通讯作者 | Zhu, TS (reprint author), Hong Kong Univ Sci & Technol, Dept Mech Engn, Hong Kong, Hong Kong, Peoples R China |
推荐引用方式
GB/T 7714 |
Zhu TS,Ye WJ,Zhang J,et al. Negative Knudsen force on heated microbeams[J]. Physical Review E,2011,84,5,:56316.
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| APA |
Zhu TS,Ye WJ,张俊,&Zhu, TS .(2011).Negative Knudsen force on heated microbeams.Physical Review E,84(5),56316.
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| MLA |
Zhu TS,et al."Negative Knudsen force on heated microbeams".Physical Review E 84.5(2011):56316.
|
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