0
RESEARCH PAPERS: Natural and Mixed Convection

Natural Convection Measurements for a Concentric Spherical Enclosure

[+] Author and Article Information
Peter M. Teertstra

Microelectronics Heat Transfer Laboratory, Department of Mechanical Engineering,  University of Waterloo , Waterloo, Ontario, Canada N2L 3G1pmt@mhtlab.uwaterloo.ca

M. Michael Yovanovich, J. Richard Culham

Microelectronics Heat Transfer Laboratory, Department of Mechanical Engineering,  University of Waterloo , Waterloo, Ontario, Canada N2L 3G1

J. Heat Transfer 128(6), 580-587 (Dec 15, 2005) (8 pages) doi:10.1115/1.2188476 History: Received March 09, 2005; Revised December 15, 2005

An experimental test program is described for the measurement of natural convection for an isothermal, heated sphere centrally located in an isothermal, cooled spherical enclosure. A transient test method is used in a reduced pressure environment to provide data for a wide range of Rayleigh number, from the limiting case of laminar boundary layer convection to the diffusive limit. Tests are performed using a fixed outer diameter for four different inner sphere diameters, resulting in diameter ratios in the range 1.5dodi4.8. The data are in excellent agreement with the exact solution for the conductive limit and are shown to be bounded by a model for the isolated, isothermal sphere.

FIGURES IN THIS ARTICLE
<>
Copyright © 2006 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Schematic of concentric spherical enclosure

Grahic Jump Location
Figure 2

Spherical enclosure with 25mm diameter sphere

Grahic Jump Location
Figure 3

Detail of 25mm sphere mounted in enclosure

Grahic Jump Location
Figure 4

Enclosure test apparatus in vacuum chamber

Grahic Jump Location
Figure 5

Calculation of time derivative of temperature, do∕di=1.5

Grahic Jump Location
Figure 6

Calculation of average inner body temperature do∕di=1.5

Grahic Jump Location
Figure 7

Heating test data

Grahic Jump Location
Figure 8

Cooling test data

Grahic Jump Location
Figure 9

Raw convection test data

Grahic Jump Location
Figure 10

Convection test results

Grahic Jump Location
Figure 11

Comparison with previous data do∕di=2.0

Tables

Errata

Discussions

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 Journal Articles
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