Observations of Complex Oscillations in a Closed Thermosyphon

[+] Author and Article Information
J. E. Hart

Department of Astrophysical, Planetary and Atmospheric Sciences, University of Colorado, Boulder, CO 80309

J. Heat Transfer 107(4), 833-839 (Nov 01, 1985) (7 pages) doi:10.1115/1.3247511 History: Received August 08, 1984; Online October 20, 2009


Observations have been made of thermal oscillations in a slightly inclined closed thermosyphon. The thermosyphon is made up of two isothermal tubes, capped at the outer ends, and joined along their axes by an insulating section. The tube assembly is filled with liquid and inclined slightly with respect to the vertical. The lower isothermal section is hotter than the upper one and convection is driven across the insulating region. Between the applied temperature difference at which simple steady convection occurs, and that required for persistent turbulent motions, there is a wide range over which thermal oscillations are observed. These oscillations reflect quasi-periodic flow as well as a type of periodic chaos.

Copyright © 1985 by ASME
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