The Transient, Steady-State, and Stability Behavior of a Toroidal Thermosyphon With a Parallel-Flow Heat Exchanger

[+] Author and Article Information
A. Mertol, R. Greif

Department of Mechanical Engineering, University of California, Berkeley, Calif. 94720

A. T. Giz

Department of Physics, University of California, Berkeley, Calif. 94720

J. Sol. Energy Eng 105(1), 58-65 (Feb 01, 1983) (8 pages) doi:10.1115/1.3266347 History: Received April 22, 1982; Online November 11, 2009


The transient and steady-state heat transfer, fluid flow, and stability of a toroidal thermosyphon have been studied theoretically. The thermosyphon is heated over the lower half and cooled over the upper half by an annular parallel-flow heat exchanger. Under some conditions the system becomes unstable and the interaction between the fluids in the thermosyphon and in the heat exchanger is of special interest. Indeed, two neutrally stable curves are obtained for the same heat exchanger conditions. Detailed results and discussion are presented for the stability of the system as well as for the temperature, velocity, pressure drop, and efficiency.

Copyright © 1983 by ASME
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