Handle URI:
http://hdl.handle.net/10754/599645
Title:
Size Dependent Orientation of Knudsen Force
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 not observed in the experiment. 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. Copyright © 2012 by ASME.
Citation:
Zhu T, Ye W, Zhang J (2012) Size Dependent Orientation of Knudsen Force. ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. Available: http://dx.doi.org/10.1115/mnhmt2012-75237.
Publisher:
ASME International
Journal:
ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer
KAUST Grant Number:
SA-C0040; UKC0016
Issue Date:
3-Mar-2012
DOI:
10.1115/mnhmt2012-75237
Type:
Conference Paper
Sponsors:
This work is supported in part by Award No. SA-C0040/UKC0016,made by King Abdullah University of Science andTechnology, and in part by Hong Kong Research GrantsCouncil under Competitive Earmarked Research Grant 621408.
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.accessioned2016-02-28T06:06:35Zen
dc.date.available2016-02-28T06:06:35Zen
dc.date.issued2012-03-03en
dc.identifier.citationZhu T, Ye W, Zhang J (2012) Size Dependent Orientation of Knudsen Force. ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. Available: http://dx.doi.org/10.1115/mnhmt2012-75237.en
dc.identifier.doi10.1115/mnhmt2012-75237en
dc.identifier.urihttp://hdl.handle.net/10754/599645en
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 not observed in the experiment. 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. Copyright © 2012 by ASME.en
dc.description.sponsorshipThis work is supported in part by Award No. SA-C0040/UKC0016,made by King Abdullah University of Science andTechnology, and in part by Hong Kong Research GrantsCouncil under Competitive Earmarked Research Grant 621408.en
dc.publisherASME Internationalen
dc.subjectDSMCen
dc.subjectGas kinetic theoryen
dc.subjectHeated microcantileveren
dc.subjectKnudsen forceen
dc.titleSize Dependent Orientation of Knudsen Forceen
dc.typeConference Paperen
dc.identifier.journalASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transferen
dc.contributor.institutionHong Kong University of Science and Technology, Hong Kong, Chinaen
kaust.grant.numberSA-C0040en
kaust.grant.numberUKC0016en
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.