Steady and Unsteady Computational Results of Full Two Dimensional Governing Equations for Annular Internal Condensing Flows
This paper presents steady and unsteady computational results obtained from numerical solutions of the full two-dimensional governing equations for annular internal condensing flows in a channel. This is achieved by tracking the “sharp” interface while solving the flow fields using COMSOL Multiphysics® and MATLAB®. The unsteady wave simulation capability is used to predict heat-transfer rates and annular regime lengths for condensing flows, which are necessary for designing modern high heat-load condensers. In addition, the results obtained for inclined, horizontal, and zero-gravity cases bring out the differences between shear driven and gravity assisted/driven flows. This accurate simulation capability leads to significant accuracy improvements over earlier reported simulation capabilities and other existing fixed grid solution techniques.
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