Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Applicability of CFD simulation of film boiling around a vertical cylinder for safety analysis of abnormal nuclear reactor operation
Year:2014
Research Areas
  • Mechanical aeronautics and naval engineering
Information
Abstract
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.
International
Si
Congress
4 International Conference on Nuclear and Renewable Energy Resources
960
Place
Antalya, TURKEY
Reviewers
Si
ISBN/ISSN
Start Date
26/10/2014
End Date
29/10/2014
From page
To page
Participants
  • Autor: Ruben Arevalo Ramirez (UPM)
  • Autor: Wister Vivas (Universidad Nacional Experimental del Táchira)
  • Autor: Ricardo Gómez (Universidad Nacional Experimental del Táchira)
  • Autor: Alberto Abanades Velasco (UPM)
  • Autor: Javier Muñoz Anton (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Modelización de Sistemas Termoenergéticos
  • Centro o Instituto I+D+i: Instituto de Fusión Nuclear
  • Departamento: Ingeniería Energética
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