test_moissonnage_selune
type: Agent

Characterization and modelling of the dispersed phase behavior in pulsed colums
type: Dataset
contact point: Organization
  fn: CCSD
keyword: buoyancy
keyword: volumic-interfacial-area
keyword: image-processing
keyword: hough
keyword: modele-eulerien
keyword: taux-de-retention
keyword: droplets
keyword: theses
keyword: eulerian-model
keyword: hough-hold-up-rate
keyword: aire-interfaciale-volumique
keyword: emulsion
keyword: experiences
keyword: infoeu-reposemanticsdoctoralthesis
keyword: traitement-dimages
keyword: physmecameflphysics-physicsmechanics-physicsfluid-mechanics-physicsclass-ph
keyword: spimecameflengineering-sciences-physicsmechanics-physicsmed-phfluids-mechanics-physicsc
keyword: gouttes
keyword: experiments
landing page: https://theses.hal.science/tel-00825558
description: In a context that requires the reduction of human impact on the environment, optimizing the recycling of nuclear spent fuel is of increasing importance. The liquid-liquid extraction, one of the main processes of spent fuel recycling, brings together two immiscible phases one of which dispersed into droplets. The mass exchange between both liquids is closely linked to interfacial area produced by the equipment used. Already operated on an industrial scale, the pulsed column is the subject of this work which aims at providing a mathematical model for the prediction of the amount of interfacial area produced so as to allow a better design of devices. The work in this thesis focuses on two main themes : the characterization of emulsions produced by pulsed columns and modelling the dispersed phase behaviour. The characterization step is intented to mesure the data required for a better understanding of the emulsion and to calibrate the model. In order to comply with the eulerian nature of the model, measures were synchronized with the pulsation cycle. Innovative measurement techniques based on image processing and exploiting this synchronization have been developed to assess the average hold-up rate, the drop sizes distribution, the anisotropy and the average interfaciale area density. These experimental works have been the subject of an oral presentation at the International Conference on Multi-phase Flows (ICMF 2010). The modellig was based on D. LHUILLIER's work who provides an eulerian mixture model for the emulsion. The emulsion is perceived as a pseudo-continous single phase whose properties are weighted by the respective volume fraction of each present phase. The novelty of the model lies on the use of a transport equation for interfacial area density which is the keystone of the design and the assessment of the efficiency of liquid-liquid extraction devices. The evolution of Interfacial area density is the result of the competition between four main phenomena tha…
identifier: NNT: 2011PA066047
issued: 2026-05-11T00:59:52.932950
language: fr
modified: 2026-05-11T00:59:52.932955

Characterization and modelling of the dispersed phase behavior in pulsed colums
type: Distribution
access URL: https://theses.hal.science/tel-00825558
format: HTML
issued: 2026-05-11T00:59:52.935139
modified: 2026-05-11T00:59:52.908206