Full Content is available to subscribers

Subscribe/Learn More  >

Rarefied Conditions in the Convective-Diffusive Regimes of a Disc in Natural Convection

[+] Author Affiliations
Jason Stafford, Ryan Enright

Alcatel-Lucent, Bell Labs, Dublin, Ireland

Roger Kempers

Alcatel-Lucent, Dublin, Ireland

Paper No. MNHMT2013-22116, pp. V001T11A005; 8 pages
  • ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer
  • ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer
  • Hong Kong, China, December 11–14, 2013
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-5615-4
  • Copyright © 2013 by ASME


A numerical investigation has been conducted on a heated circular disc immersed in quiescent air in an enclosed environment and for rarefied conditions. For moderate to low Rayleigh numbers, laminar natural convection can be described by two regimes and a transitional region which separates the diffusive limit and laminar boundary layer, or convective limit. A practical scenario was simulated which involved lowering Rayleigh number and increasing Knudsen number of the disc simultaneously to examine the convective-diffusive relationship under a rarefied condition. The numerical model used to solve the continuum equations has been extended using a first order slip condition and assessed based on the available experimental data from literature. Although similar convective-diffusive regimes exist, there is a divergence from the classical continuum diffusive limit when operating in rarefied conditions with Knudsen numbers of order 10−3 or higher. The conditions for this second transitional region in heat transport from the surface have been highlighted and have been attributed to the temperature jump condition. This has resulted in recommendations on the limitation of existing analytical heat transfer models when applied to rarefied conditions. The findings also have practical significance to thermal metrology and aerospace industries where buoyancy induced flows and low ambient pressures are frequently experienced.

Copyright © 2013 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In