Dispersion in jets, decontamination processes at surfaces and natural ventilation
Event details
| Date | 25.03.2014 |
| Hour | 16:15 › 17:15 |
| Speaker |
Dr Julien Landel, University of Cambridge, UK Bio: Julien Landel is a Post-Doctoral Research Associate in the Department of Applied Mathematics and Theoretical Physics (DAMTP) and Junior Research Fellow of Magdalene College at the University of Cambridge. In 2009 he received a M.Sci. from École Polytechnique (Paris), where he had received the First Research Prize in Mechanics for his experimental study on the dynamics of large air bubbles rising in water. The same year, he also received a M.Eng. from the National University of Singapore. He received a Ph.D. in Applied Mathematics from Churchill College at the University of Cambridge in 2012. As a PhD student, he studied the transport, dispersion and mixing properties of confined turbulent jets, under the supervision of Colm Caulfield and Andy Woods. He was Finalist of the Osborne Reynolds Research Student Award in the UK for his dissertation in fluid dynamics. In 2012, he started his post-doctoral research under the supervision of Stuart Dalziel at DAMTP to study the fluid mechanics of decontamination processes. In 2013, he was awarded a three-year Thomas Nevile Research Fellowship by Magdalene College, Cambridge, for his post- doctoral research. |
| Location | |
| Category | Conferences - Seminars |
Abstract : In the first part of the talk, I will present one of my ongoing research interests on the dispersion and mixing
in confined turbulent jets. This research is relevant to chemical reactors, the coking process in oil refinement, as well as pollution in shallow rivers flowing into lakes or oceans. Confined jets display a fascinating
structure with a high-speed meandering core and large counter-rotating eddies. I model the impact of the core
and the eddies on the transport and dispersion of tracers using an advection-diffusion model. The time- dependent analytical solution is in good agreement with experimental results and reveals that a significant quantity of passive tracers can be transported faster than the advection speed predicted using a top-hat velocity profile in the jet.
In the second part of the talk, I will discuss my current post-doctoral research on the fluid mechanics of decontamination processes. The applications range from the efficient decontamination of hazardous materials
during chemical warfare, to reducing water and energy consumption for dishwashers. The fundamental
mechanisms involved in decontamination can be modelled as advection, diffusion and reaction processes. I
will discuss their impact on the optimization of the decontamination process in the light of my experimental results.
Finally, I will describe my future research plans. I intend to investigate the influence of thermal mass and smart innovative materials, such as phase-change materials, on the ventilation of buildings. The impact of thermal mass has often been overlooked in models for natural ventilation. There is major potential benefit
from using thermal mass, such as reducing daily temperature fluctuations and storing excess thermal energy. Designing new low-energy buildings using natural ventilation as well as adapting existing buildings
represents a formidable engineering challenge, and there is a pressing need to understand and model the underlying physics.
in confined turbulent jets. This research is relevant to chemical reactors, the coking process in oil refinement, as well as pollution in shallow rivers flowing into lakes or oceans. Confined jets display a fascinating
structure with a high-speed meandering core and large counter-rotating eddies. I model the impact of the core
and the eddies on the transport and dispersion of tracers using an advection-diffusion model. The time- dependent analytical solution is in good agreement with experimental results and reveals that a significant quantity of passive tracers can be transported faster than the advection speed predicted using a top-hat velocity profile in the jet.
In the second part of the talk, I will discuss my current post-doctoral research on the fluid mechanics of decontamination processes. The applications range from the efficient decontamination of hazardous materials
during chemical warfare, to reducing water and energy consumption for dishwashers. The fundamental
mechanisms involved in decontamination can be modelled as advection, diffusion and reaction processes. I
will discuss their impact on the optimization of the decontamination process in the light of my experimental results.
Finally, I will describe my future research plans. I intend to investigate the influence of thermal mass and smart innovative materials, such as phase-change materials, on the ventilation of buildings. The impact of thermal mass has often been overlooked in models for natural ventilation. There is major potential benefit
from using thermal mass, such as reducing daily temperature fluctuations and storing excess thermal energy. Designing new low-energy buildings using natural ventilation as well as adapting existing buildings
represents a formidable engineering challenge, and there is a pressing need to understand and model the underlying physics.
Practical information
- General public
- Free
Organizer
- IGM GE
Contact
- Géraldine Palaj