Reflooding with internal boiling of a heating model porous medium with mm-scale pores
| Autor: | Paul Sapin, Michel Quintard, Florian Fichot, Paul Duru, Marc Prat, Ange Gourbil |
|---|---|
| Přispěvatelé: | Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut de Radioprotection et de Sûreté Nucléaire - IRSN (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE) |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Mécanique des fluides 020209 energy Porous media Context (language use) 02 engineering and technology 7. Clean energy 01 natural sciences 010305 fluids & plasmas Cylinder (engine) law.invention law Boiling 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Nuclear safety [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] Fluid Flow and Transfer Processes Heating element Mechanical Engineering Hot debris bed Mechanics Nuclear reactor Condensed Matter Physics Superheating Porous medium Loss-of-coolant accident |
| Zdroj: | International Journal of Heat and Mass Transfer International Journal of Heat and Mass Transfer, Elsevier, 2016, vol. 99, pp. 512-520. ⟨10.1016/j.ijheatmasstransfer.2016.04.013⟩ |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/j.ijheatmasstransfer.2016.04.013 |
| Popis: | International audience; This paper presents a pore-scale experimental study of the reflooding of a two-dimensional model porous medium. The objective is to better understand the reflooding mechanisms in play in the context of nuclear reactor safety. The hot debris bed that forms in a nuclear reactor following a loss of coolant accident is comparable to a heat-generating porous medium. Its cooling by water reflooding involves intense boiling mechanisms that must be modeled properly to assess mitigation procedures. The experimental study presented in this paper focuses on the phenomenology of reflooding of a model porous medium composed of a bank of mm-scale heating cylinders placed between two ceramic plates. A Fluorinert™ liquid, HFE-7000, is injected at a temperature close to saturation into the dry and superheated porous medium. Each cylinder of the test section is used both as a heating element and a temperature probe, which enables to track the evolution of the three different macroscopic zones identified during cooling of the system. The reflooding dynamics, in particular the cooling fronts velocities, are thus determined thanks to pore-scale thermal measurements together with direct visualizations. The influence of the injection flow rate and of the heating power are studied in a parametric way. |
| Databáze: | OpenAIRE |
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