Improvement of Physical Modeling for Coupled Heat and Mass Transfer in a Square Cavity with Condensation in the Presence of Non-Condensable Gas - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Accéder directement au contenu
Communication Dans Un Congrès Année : 2019

Improvement of Physical Modeling for Coupled Heat and Mass Transfer in a Square Cavity with Condensation in the Presence of Non-Condensable Gas

Résumé

During accident scenarios, pressure increase in the containment building caused by steam release is significantly limited by condensation on the wall. The comprehension of this mechanism requires a reliable physical model of the coupled heat and mass transfer inside a binary gas mixture involving a noncondensable species. In this paper, we develop such a model for natural convection of a mixture of airand vapor in a two-dimensional square cavity. The flow velocity being small enough compared to sound speed, the low Mach approximation is taken to filter acoustic waves. The specificity of our model compared to the classical double diffusive approach, is to take into account the species interdiffusion phenomenon of a mixture of two gases with eventually different specific heat ratios. A Pressure-Implicit algorithm with Splitting Operators (PISO) is implemented with OpenFOAM to solve the model with a special treatment of the boundary conditions based on the partial velocity of air. Mesh convergence is established and comparisons with the double diffusive model are made. Our analysis shows that species interdiffusion represents an important amount of the heat transfer and that without its presence, the balance of heat fluxes cannot be ensured at steady state. The existence of interdiffusion also modifies the diffusive heat flux. Influence on the convective heat transfer. These two corrections need to be taken into account in further research.
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Dates et versions

cea-04383033 , version 1 (09-01-2024)

Identifiants

  • HAL Id : cea-04383033 , version 1

Citer

Nan Jiang, Etienne Studer, Bérengère Podvin. Improvement of Physical Modeling for Coupled Heat and Mass Transfer in a Square Cavity with Condensation in the Presence of Non-Condensable Gas. 18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-18), Aug 2019, Portland (OR), United States. pp.6579-6592. ⟨cea-04383033⟩
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