0

Full Content is available to subscribers

Subscribe/Learn More  >

A Two-Temperature Model for the Analysis of Passive Thermal Control Systems for Electronics

[+] Author Affiliations
Shankar Krishnan, Jayathi Y. Murthy, Suresh V. Garimella

Purdue University, West Lafayette, IN

Paper No. IMECE2002-33335, pp. 105-115; 11 pages
doi:10.1115/IMECE2002-33335
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 7
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3638-X | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

Passive control of unsteady thermal loads using phase change materials is being explored for a variety of military and consumer electronics applications. The phase change materials usually have very low thermal conductivity. To enhance the thermal response of the system, thermal conductivity enhancers like metal foams, internal fins and metal filler particles have been proposed. Local thermal equilibrium between the solid matrix and the fluid is not ensured in such systems since the thermal conductivities and heat capacities for the fluid and solid are very different. The use of a single volume-averaged energy equation for both the phases cannot be justified in such situations. A two-medium approach is developed in the present work to account for the local thermal non-equilibrium. Separate energy equations are written for the solid and fluid respectively, and are closed using a steady-state interstitial heat transfer coefficient between the two phases. A general momentum equation which includes the Brinkman-Forchheimer extension to Darcy flow is employed. The resulting equations are solved using a finite volume scheme. The influence of various parameters such as the ratios of fluid to solid conductivities and heat capacities, porosity, Rayleigh number, Prandtl number, and Darcy number on the thermal and flow fields is investigated. The importance of using a two-medium approach for such situations is illustrated using the results obtained.

Copyright © 2002 by ASME

Figures

Tables

Interactive Graphics

Video

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

NOTE:
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