A means was developed for extending the predictive capability of the Equivalent Single-Tube Model (ESTM) to accurately predict the onset of a self-sustained oscillatory flow instability for a multitube condensing flow system. The model includes the effects of compressibility, subcooled liquid inertia, and thermal and flow distribution asymmetry. Previously, liquid inertia, a necessary mechanism for the instability, had not been modeled for a multitube system. Extensive experimental data was obtained for a two-tube system that verifies not only the predictive capability of the ESTM, but also its accuracy and its wide range of applicability.

Issue Section:
Two-Phase Flow and Heat Transfer
Keywords:
Condensation, Heat Transfer, Instability, Phase Change, Two-Phase, heat exchangers, flow instability, compressibility, limit cycles, condensers (steam plant), condensation, fluid oscillations
Topics:
Compressibility, Condensation, Flow (Dynamics), Flow instability, Inertia (Mechanics), Vapors, Limit cycles, Condensers (steam plant), Stability
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