Item request has been placed! ×
Item request cannot be made. ×
loading  Processing Request

Uncertainty quantification in rarefied dynamics of molecular gas: Rate effect of thermal relaxation

Item request has been placed! ×
Item request cannot be made. ×
loading   Processing Request
Read Online Read More Add to Saved list
  • Author(s): Li, Qi; Zeng, Jianan; Su, Wei; Wu, Lei
  • Document Type:
    Electronic Resource
  • Online Access:
    http://repository.hkust.edu.hk/ir/Record/1783.1-119594
    https://doi.org/10.1017/jfm.2021.338
    http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0022-1120&rft.volume=&rft.issue=&rft.date=2021&rft.spage=&rft.aulast=Li&rft.aufirst=&rft.atitle=Uncertainty+quantification+in+rarefied+dynamics+of+molecular+gas%3A+Rate+effect+of+thermal+relaxation&rft.title=Journal+of+Fluid+Mechanics
    http://www.scopus.com/record/display.url?eid=2-s2.0-85105553111&origin=inward
    http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000646616300001
  • Additional Information
    • Publisher Information:
      Cambridge University Press 2021
    • Abstract:
      The thermal conductivity of a molecular gas consists of the translational and internal parts. Although in continuum flows the total thermal conductivity itself is adequate to describe the heat transfer, in rarefied gas flows they need to be modelled separately, according to the relaxation rates of translational and internal heat fluxes in an homogeneous system. This paper is dedicated to quantifying how these relaxation rates affect rarefied gas dynamics. The kinetic model of Wu et al. (J. Fluid Mech., vol. 763, 2015, pp. 24-50) is adapted to recover the relaxation of heat fluxes, which is validated by the direct simulation Monte Carlo method. Then the model of Wu et al., which has the freedom to adjust the relaxation rates, is used to investigate the rate effects of thermal relaxation in problems such as the normal shock wave, creep flow driven by Maxwell's demon and thermal transpiration. It is found that the relaxation rates of heat flux affect rarefied gas flows significantly, even when the total thermal conductivity is fixed. © The Author(s), 2021.
    • Subject Terms:
      Rarefied gas flow; Article
    • Availability:
      Open access content. Open access content
    • Note:
      English
    • Other Numbers:
      HNK oai:repository.hkust.edu.hk:1783.1-119594
      Journal of Fluid Mechanics, v. 917, May 2021, article number A58
      0022-1120
      1469-7645
      1363077557
    • Contributing Source:
      HONG KONG UNIV OF SCI & TECH, THE
      From OAIster®, provided by the OCLC Cooperative.
    • Accession Number:
      edsoai.on1363077557
HoldingsOnline