Handle URI:
http://hdl.handle.net/10754/552993
Title:
Negative Knudsen force on heated microbeams
Authors:
Zhu, Taishan; Ye, Wenjing; Zhang, Jun
Abstract:
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.
Citation:
Negative Knudsen force on heated microbeams 2011, 84 (5) Physical Review E
Publisher:
American Physical Society (APS)
Journal:
Physical Review E
Issue Date:
18-Nov-2011
DOI:
10.1103/PhysRevE.84.056316
Type:
Article
ISSN:
1539-3755; 1550-2376
Additional Links:
http://link.aps.org/doi/10.1103/PhysRevE.84.056316
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorZhu, Taishanen
dc.contributor.authorYe, Wenjingen
dc.contributor.authorZhang, Junen
dc.date.accessioned2015-05-17T20:46:21Zen
dc.date.available2015-05-17T20:46:21Zen
dc.date.issued2011-11-18en
dc.identifier.citationNegative Knudsen force on heated microbeams 2011, 84 (5) Physical Review Een
dc.identifier.issn1539-3755en
dc.identifier.issn1550-2376en
dc.identifier.doi10.1103/PhysRevE.84.056316en
dc.identifier.urihttp://hdl.handle.net/10754/552993en
dc.description.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.en
dc.publisherAmerican Physical Society (APS)en
dc.relation.urlhttp://link.aps.org/doi/10.1103/PhysRevE.84.056316en
dc.rightsArchived with thanks to Physical Review Een
dc.titleNegative Knudsen force on heated microbeamsen
dc.typeArticleen
dc.identifier.journalPhysical Review Een
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionDepartment of Mechanical Engineering, The Hong Kong University of Science and Technology, Hong Kongen
dc.contributor.institutionThe Hong Kong University of Science and Technology, Hong Kongen
dc.contributor.institutionLaboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, People's Republic of Chinaen
kaust.authorYe, Wenjingen
kaust.grant.fundedcenterKAUST-HKUST Micro/Nanofluidic Joint Laboratoryen
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.