Population Balance Method in Organic Liquids for
il y a 2 semaines
**Population balance method in organic liquids for bubble column reactors**:
- Réf **ABG-120138**
- Sujet de Thèse- 08/02/2024- Contrat doctoral- IFP Energies nouvelles- Lieu de travail- Lyon - Auvergne-Rhône-Alpes - France- Intitulé du sujet- Population balance method in organic liquids for bubble column reactors- Champs scientifiques- Chimie
- Mots clés- Bubble column, Population balance modelling, Breakup and Coalescence**Description du sujet**:
Bubble columns are commonly used in industry for bioprocesses, toluene hydrogenation for hydrogen transport or oligomerization of bio-ethylene... However, predicting the bubble size distribution in a bubble column under specifics operating conditions remains a major challenge for the scientific community. Indeed, the bubble size distribution depends on various parameters such as the bulk fluid properties, contamination of the gas-liquid interface, design of columnAll these parameters impact coalescence and breakup mechanisms that occur at the bubble scale by modifying the physico-chemical properties of the gas-liquid system, but also the turbulence of flow. A local description of bubble breakup and coalescence phenomena is thus necessary to predict the bubble size distribution in the reactor. However, in commercial CFD codes using k- two-fluid models, only scales larger than the bubble diameter, are simulated. Breakage and coalescence phenomena require thus further effort to be modelled from local flow characteristics predicted by CFD.
The main goal of the present proposal is to build up a breakthrough methodology based on both small and large scales experiments to determine breakage and coalescence kernels in organic liquids. Small scale experiments under controlled conditions will be performed at ICPF (Prague) to investigate breakage and coalescence phenomena. Then, bubble size distribution will be characterized in realistic bubble columns for air-water and organic systems. Two column diameters will be studied at ICPF (Prague) and at IFPEN (Lyon), to consider scale-up effects. The last stage of the PhD consists in making a link between small scale experiments under controlled conditions to the one performed in bubble columns. To do so, we will rely on breakup and coalescence kernels developed at small scale to predict the bubble size distribution and compare it to the experimental one. Kernels will be first tested using a simplified Population Balance model developed at IFPEN before being implemented in 3D two-fluid model CFD simulations.
**Nature du financement**:
- Contrat doctoral**Précisions sur le financement**:
**Présentation établissement et labo d'accueil**:
- IFP Energies nouvellesIFP Energies nouvelles is a French public-sector research, innovation and training center. Its mission is to develop efficient, economical, clean and sustainable technologies in the fields of energy, transport and the environment. For more information, see our WEB site.
IFPEN offers a stimulating research environment, with access to first in class laboratory infrastructures and computing facilities. IFPEN offers competitive salary and benefits packages. All PhD students have access to dedicated seminars and training sessions.
**Site web**:
**Academic requirements** University Master degree or Engineering school in Chemical engineering/Fluid mechanics
**Language requirements** English level B2 (CEFR)
**Other requirements** Fondness for experiments
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