Heat Transfer in an Air Thermosyphon Permafrost Protection Device

[+] Author and Article Information
A. L. Evans, R. L. Reid

Mechanical and Aerospace Engineering Department, The University of Tennessee, Knoxville, Tenn. 37916

J. Energy Resour. Technol 104(3), 205-210 (Sep 01, 1982) (6 pages) doi:10.1115/1.3230404 History: Received November 08, 1979; Revised January 04, 1982; Online October 22, 2009


Velocity and temperature profiles were measured in a prototype air thermosyphon permafrost protection device. This device, known as the air convection pile, consists of an 18-in. (0.46-m) outer tube containing a shorter concentric 10-in. (0.25-m) tube extending from 10 to 60 ft (3 to 18 m) into the permafrost. Measurements showed a low frequency oscillating flow in both the annulus and inner tube. Heat removal rates compared favorable with an analytical model and previous experimental results, but the annulus velocity profiles were significantly different, possibly due to the oscillation in the flow.

Copyright © 1982 by ASME
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