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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
Source PublicationPhysical Review E
AbstractKnudsen 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.
KeywordBoltzmann-equation Spherical-particle Numerical-analysis Rarefied-gas Thermophoresis Pressure Model Flow
Subject AreaPhysics
Indexed BySCI ; EI
WOS IDWOS:000297467300007
WOS Research AreaPhysics
WOS SubjectPhysics, Fluids & Plasmas ; Physics, Mathematical
Funding OrganizationThis 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.
Citation statistics
Cited Times:27[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZhu, TS (reprint author), Hong Kong Univ Sci & Technol, Dept Mech Engn, Hong Kong, Hong Kong, Peoples R China
Recommended Citation
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.
APA Zhu TS,Ye WJ,张俊,&Zhu, TS .(2011).Negative Knudsen force on heated microbeams.Physical Review E,84(5),56316.
MLA Zhu TS,et al."Negative Knudsen force on heated microbeams".Physical Review E 84.5(2011):56316.
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