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− | Porous media are nowadays common materials in many thermal or mechanical engineering applications such as heat exchangers or oil/air separators | + | Porous media are nowadays common materials in many thermal or mechanical engineering applications such as heat exchangers or oil/air separators. However, since a few decades, a new type of such "macro-porous" media called metal foams often used in the engineering field has emerged. Compared to other standard materials, metal foams or metfoams constitute a new class of materials, known to have many interesting combinations of physical & mechanical properties. |
=== ''Target Applications, Hurdles'' === | === ''Target Applications, Hurdles'' === |
Revision as of 22:37, 1 April 2016
Contents
Flow, heat transfer & particle transport in metal foams
under construction !!!
Context
Porous media are nowadays common materials in many thermal or mechanical engineering applications such as heat exchangers or oil/air separators. However, since a few decades, a new type of such "macro-porous" media called metal foams often used in the engineering field has emerged. Compared to other standard materials, metal foams or metfoams constitute a new class of materials, known to have many interesting combinations of physical & mechanical properties.
Target Applications, Hurdles
Since the possible fields of applications of metal foams are very large, this project has the ambition to tackle the challenge of proposing a numerical/experimental methodology in order to create the design tools for next generation metal foams conception & optimization, by not only characterizing but also proposing & determining the more adapted macro/micro scale pore structure for each specific application. We shall mainly focus on developing a methodology for the design of high performance compact heat exchangers and heat sinks, e.g. in the context of the thermal management of direct thermo-electric converters or electronic devices coolers, for instance in the context of LED thermal management. Above the enhanced thermal conduction or the desired filtering, undesired particulate fouling is a common phenomenon in porous media/metal foams and may dramatically reduce the heat transfer efficiency.
Main objectives
The main research objectives are to:
- develop a numerical framework based on an Immersed Boundary Method (IBM) including a Level-Set technique for tracking the complex fluid/solid interface,
- incorporate physical interactions between turbulent flow, particles and heat transfer in complex porous structures within the proposed framework while preserving high-order accuracy (using adapted versions of DEM, Discrete Element Method)
- apply the validated numerical framework to identify the key contributing parameters to fouling mechanisms and its mitigation in porous metal foams in turbulent heated flows.
An IBM strategy
Idealized and realistic geometries
Preliminary DNS Results
Participants
Emilie Sauret, Sofiane Khelladi, Thomas Sarfati, Lucas Manueco, Eric Herbert, Yves D'Angelo.