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Descripción
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| Film boiling is a heat transfer mechanism that might appear in nuclear reactors during abnormal operating conditions, as happens during a loss of coolant accident. In the present investigation film boiling around a finite vertical cylinder was studied by means of Computational Fluid Dynamics (CFD) simulations, considering five cases that include different liquids (water and nitrogen) and different levels of pressure and surface temperature. Volume of Fluid method for the treatment of multiphase flow was used and a User Defined Function was programmed to consider the exchange of mass and energy between the phases. The simulations were performed with a vertical cylinder of 32 mm in diameter and 32 mm in high, placed in a two-dimensional and axisymmetric domain of 0.1 m x 0.25 m. Results obtained for the heat flux show a periodic fluctuating behavior in time as a consequence of periodical variations in the thickness of the vapor film around the cylinder. A wavy liquid-vapor interface is observed as is reported in experimental works. The simulations results are compared with the experimental values reported by literature as well as with values obtained from the correlations. The results show that the computational code used captures reasonably well the physics involved in the film boiling and formed into a promising tool for the study of processes in which this phenomenon appears. | |
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Internacional
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Si |
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Nombre congreso
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4 International Conference on Nuclear and Renewable Energy Resources |
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Tipo de participación
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960 |
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Lugar del congreso
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Antalya, TURKEY |
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Revisores
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Si |
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ISBN o ISSN
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DOI
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Fecha inicio congreso
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26/10/2014 |
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Fecha fin congreso
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29/10/2014 |
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