INVESTIGADORES
BONETTO Fabian Jose
congresos y reuniones científicas
Título:
THE MOVING BOILING-BOUNDARY MODEL OF A VERTICAL TWO-PHASE FLOW CHANNEL REVISITED
Autor/es:
THELER, GERMAN; CLAUSSE, ALEJANDRO; BONETTO, FABIAN
Reunión:
Congreso; Mecánica Computacional Vol XXIX,; 2010
Resumen:
Vertical flow involving phase changes is a subject of interest in several engineering branches,
especially in the nuclear industry. Not only is there a concern about it in the design of boiling water reactors,
but also safety evaluation and analysis in pressurised reactors involve a substantial amount of two
phase flow calculations. As there is not yet a sound theoretical basis able to solve general problems, several
mathematical modelsoften based on empirical or phenomenological observationswith limited
applicability have been introduced to deal with particular situations. One example of these ad-hoc models
is the moving boundary nodalisation proposed by Clausse and Lahey, that is reasonably simple and
at the same time recovers experimental results with a high degree of accuracy. In this paper, the model is
revisited and the equations are developed in detail keeping the intermediate mathematical steps. Alternative
formulations that can be conveniently applied to different problems (i.e. single channel, parallel
channels, adiabatic risers, non-steady external pressure drops, etc) are proposed, trying to take advantages
of modern differential-algebraic equations solving methods. The general results obtained in this
work can be extended to build particular models for different applications, including thermalhydraulic
representations of nuclear power plants.