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Multiphase Science and Technology

Publicou 4 edições por ano

ISSN Imprimir: 0276-1459

ISSN On-line: 1943-6181

SJR: 0.144 SNIP: 0.256 CiteScore™:: 1.1 H-Index: 24

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COMPUTATIONAL FLUID DYNAMICS SIMULATION OF SINGLE BUBBLE DYNAMICS IN CONVECTIVE BOILING FLOWS

Volume 25, Edição 2-4, 2013, pp. 287-309
DOI: 10.1615/MultScienTechn.v25.i2-4.110
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RESUMO

A sharp-interface phase-change model, which was developed in the framework of direct numerical simulation, has been extended to turbulent flows by introducing the Smagorinsky subscript-grid-scale model and applied to simulations of convective nucleate boiling flows. The developed model is validated against the experiments of convective boiling flows in the horizontal and vertical flow directions. Although the bubbles were successively released from the wall in the experiment, the simulations take into account only single bubble growth, and several assumptions are used for the initial and boundary conditions to complement the limited measured data. Thus, the comparison between the simulation and the experiment is not considered as a rigorous validation. In spite of this, the computed bubble lift-off diameter and lift-off time show generally good agreement with the experiments under the given conditions, and the applicability of the developed method to the simulation of convective boiling flows is demonstrated. Compared to a previous computational fluid dynamics study, our method cannot show improvement in terms of accuracy; however, the effects of turbulence are taken into account in our model, which should be essential for convective boiling flows with higher Reynolds numbers. The discrepancy between the measurement and simulation results is mainly caused by the steady-state assumption used in the micro-region model.

CITADO POR
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  4. Demazière Christophe, Sanchez-Espinoza Victor Hugo, Chanaron Bruno, Garbil R., Davies C., Diaconu D., Advanced numerical simulation and modelling for reactor safety − contributions from the CORTEX, HPMC, McSAFE and NURESAFE projects, EPJ Nuclear Sciences & Technologies, 6, 2020. Crossref

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