SharePoint
Aide
IRSN, Institut de radioprotection et de sûreté nucléaire

Search our site :

ok

Contact us :

ok
En Fr

Enhancing Nuclear Safety


Research

Publications

The use of a diffuse interface model to estimate effective transport properties for two-phase flows in porous media

International Topical Meeting on Nuclear Thermal-Hydraulics (NURETH-11), Avignon, October 2005

Florian Fichot, Fabien Duval, Phongsan Meekunnasombat (BARC), A. Garcia, Juilien Belloni, M. Quintard.

Document type > *Congrès/colloque

Keywords > safety, fluid flow, porous medium, severe accident

Research Unit > IRSN/DPAM/SEMCA/LESAM

Authors > BELLONI Julien, DUVAL Fabien, FICHOT Florian, MEEKUNNASOMBAT Phongsan

Publication Date > 03/10/2005

Summary

In the framework of its research programme on severe nuclear reactor accidents, IRSN investigates the water flooding of an overheated porous bed, where complex two-phase flows are likely to exist. A better understanding of the flow at the pore level appears to be necessary in order to justify and improve closure laws of macroscopic models. To investigate the local features of a two-phase flow in complex geometries, two alternative ways are available : experiments with high accuracy local measurements or direct numerical simulation (DNS) of the flows in small scale volumes. Within the framework of the second gradient theory, diffuse interface models can be derived for both single-component and binary fluids. The latter model is often referred to as the Cahn-Hilliard model.

In this paper, the Cahn-Hilliard model is used to simulate immiscible two-phase flows in a representative geometry of a particle bed. The results are used to characterize the configuration of the phases and possible flow regimes as a function of the saturation. Correlations for the relative permeabilities of each phase as a function of saturation are also presented. The results are discussed and compared with classical correlations.

Send Print

Contact

More about


Close

Send to a friend

The information you provide in this page are single use only and will not be saved.
* Required fields

Recipient's email:*  

Sign with your name:* 

Type your email address:*   

Add a message :

Do you want to receive a copy of this email?

Send

Cancel

Close

WP_IMPRIMER_TITLE

WP_IMPRIMER_MESSAGE

Back

Ok