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Projects / Programmes source: ARIS

Three-dimensional eulerian model of convective boiling

Research activity

Code Science Field Subfield
2.03.00  Engineering sciences and technologies  Energy engineering   

Code Science Field
T140  Technological sciences  Energy research 
Keywords
two-phase flow, heat transfer, convective boiling, Eulerian model, three-dimensional simulations
Evaluation (rules)
source: COBISS
Researchers (2)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  16435  PhD Boštjan Končar  Energy engineering  Researcher  2004 - 2006  367 
2.  02852  PhD Borut Mavko  Energy engineering  Head  2004 - 2006  930 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  90,664 
Abstract
The phenomenon of boiling in the heated channels is often encountered in energy and process systems. The phenomenon is especially important in water-cooled nuclear reactors, since boiling on heated surfaces has significant impact on operating and accident conditions. A recent trend in nuclear reactor design is to develop passive safety systems, where convective boiling occurs at relatively low pressure (below 3 bar) and at moderate heat fluxes. Due to high density ratio between vapour and liquid phase, the analysis of flow boiling at low pressure is significantly more complicated than at relatively high pressure conditions. Available models for diabatic two-phase flow in current generation computational codes are mostly inadequate for detailed generic analysis of flow dynamics and phase change heat transfer mechanisms during convective flow boiling. Our goal within this project is to develop a generic model of convective flow boiling, which will be based on a three-dimensional Eulerian description of two-phase flow. Using this model, the evolution of two-phase flow parameters in space and time will be predicted. The micro-scale mechanisms of the wall evaporation will be described with generic physical models. Special attention will be given to the modeling of the interfacial area development and to the modeling of turbulence in the boiling flow. The model will be validated on various convective boiling experiments.
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