A transient two-dimensional thermosyphon model is presented that accounts for conjugate heat transfer through the wall and the falling condensate film. The complete transient two-dimensional conservation equations are solved for the vapor flow and pipe wall, and the liquid film is modeled using a quasi-steady Nusselt-type solution. The model is verified by comparison with existing experimental data for a low-temperature thermosyphon with good agreement. A typical high-temperature thermosyphon was then simulated to examine the effects of vapor compressibility and conjugate heat transfer.

Issue Section:
Multiphase Heat Transfer
Keywords:
Condensation, Evaporation, Heat Pipes and Thermosyphons
Topics:
Condensed matter, Transients (Dynamics), Heat transfer, Vapors, Compressibility, Condensation, Evaporation, Flow (Dynamics), Heat pipes, High temperature, Liquid films, Low temperature, Pipes
Copyright © 1994
 by The American Society of Mechanical Engineers
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