0
RESEARCH PAPERS: Offshore Mechanics

Performance of a Closed-Tube Thermosyphon With Large Length-Diameter Ratios

[+] Author and Article Information
G. S. H. Lock, G. A. Simpson

Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada

J. Offshore Mech. Arct. Eng 111(1), 22-28 (Feb 01, 1989) (7 pages) doi:10.1115/1.3257134 History: Received January 01, 1986; Revised May 18, 1988; Online October 30, 2009

Abstract

The experimental work reported here is concerned with the single-phase closed thermosyphon under conditions which are appropriate to a northern application: large length-diameter ratios and heated lengths much greater than cooled lengths. The purpose is twofold: to generate empirical heat transfer data which represent the conservative lower limit of performance (in the absence of boiling or bubbling); and to reveal the thermal and momentum exchange mechanisms which operate at the junction of the heated and cooled sections. The apparatus consisted of a 102-mm-dia, vertical steel pipe of overall length varying from 2 m to 6 m. The lower section of the pipe was heated by means of electric-resistive tape, and the upper section cooled by means of a water jacket. Heat transfer data, plotted in the usual form of Nusselt number versus the quotient of the Rayleigh number and the length-diameter ratio, show the effect of geometry. This data was obtained for 10 ≤ L H /d ≤ 50, and 1 ≤ L H /L c ≤ 20. An empirical correlation is developed.

Copyright © 1989 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

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