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Simulation of hydrogen mitigation in catalytic recombiner. Part-II: Formulation of a CFD model

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Title Simulation of hydrogen mitigation in catalytic recombiner. Part-II: Formulation of a CFD model
 
Creator PRABHUDHARWADKAR, DM
IYER, KN
 
Subject IGNITION
PLATINUM
MIXTURES
 
Description This paper aims at formulation of a model compatible with CFD code to simulate hydrogen distribution and mitigation using a Passive Catalytic Recombiner in the Nuclear power plant containments. The catalytic recombiner is much smaller in size compared to the containment compartments. In order to fully resolve the recombination processes during the containment simulations, it requires the geometric details of the recombiner to be modelled and a very fine mesh size inside the recombiner channels. This component when integrated with containment mixing calculations would result in a large number of mesh elements which may take large computational times to solve the problem. This paper describes a method to resolve this simulation difficulty. In this exercise, the catalytic recombiner alone was first modelled in detail using the best suited option to describe the reaction rate (Prabhudharwadkar et al., 2005, 2011). A detailed parametric study was conducted, from which correlations for the heat of reaction (hence the rate of reaction) and the heat transfer coefficient were obtained. These correlations were then used to model the recombiner channels as single computational cells providing necessary volumetric sources/sinks to the energy and species transport equations. This avoids full resolution of these channels, thereby allowing larger mesh size in the recombiners. The above mentioned method was successfully validated using both steady state and transient test problems and the results indicate very satisfactory modelling of the component. (C) 2011 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2012-06-26T07:44:10Z
2012-06-26T07:44:10Z
2011
 
Type Article
 
Identifier NUCLEAR ENGINEERING AND DESIGN,241(5)1758-1767
0029-5493
http://dx.doi.org/10.1016/j.nucengdes.2011.01.013
http://dspace.library.iitb.ac.in/jspui/handle/100/14167
 
Language English