A Mechanistic Model for Slightly Subcooled Flow Boiling in Vertical Tubes
Slightly subcooled flow boiling is an important part of subcooled flow boiling in which bubbles start to detach from the wall and the void fraction experiences a rapid increase due to the sufficiently low liquid subcooling. Currently, the predicting of this process mainly relies on numerical simulations or a combination of empirical correlations while the mechanistic analysis is still lacking. Therefore, the present paper focuses on the theoretical analysis of bubble behaviors and interactions in slightly subcooled flow boiling and a mechanistic model is developed based on a set of twodimensional steady-state conservation equations of mass and energy. In this model, the flow is divided into two regions, the bubble layer region and the core region, based on the bubble departure diameter. And the results are verified with experiments of axial void fraction distributions and liquid temperature distributions which show high correspondence between predictions and experimental results. In addition, energy exchanges in different regions and mass exchanges in the radial direction are obtained and analyzed using this model, based on which more detailed mechanisms on the slightly subcooled flow boiling are explained
Year of publication: |
[2022]
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Authors: | he, wen ; Zhao, Chenru ; Bo, Hanliang |
Publisher: |
[S.l.] : SSRN |
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