Direct numerical simulation of the thermal dehydration reaction in a TGA experiment
| Autor: | AA Anton van Steenhoven, Ccm Camilo Rindt, M Mohammadreza Gaeini, S Shuiquan Lan, HA Herbert Zondag |
|---|---|
| Přispěvatelé: | Energy Technology, Chemical Engineering and Chemistry |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Convection
Work (thermodynamics) Materials science Nucleation and growth 020209 energy Direct numerical simulation Nucleation Energy Engineering and Power Technology Thermodynamics 02 engineering and technology 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering Dehydration reaction Mass transfer Heat transfer Direction numerical simulation 0202 electrical engineering electronic engineering information engineering Fluid dynamics Thermochemical heat storage 0210 nano-technology Reaction kinetics Salt hydrate TGA measurement |
| Zdroj: | Applied Thermal Engineering, 128, 1175-1185. Elsevier |
| ISSN: | 1359-4311 |
| Popis: | This work presents a detailed mathematical model of the coupled mass and heat transfer processes in salt hydrate grains in a TGA experiment. The purpose of developing this numerical model is to get a more fundamental understanding of the influence of parameters like particle size, nucleation rate and vapor pressure on the dehydration reaction in a TGA experiment. Such a model needs a detailed description of the fluid flow and water vapor distribution between the particles. The dehydration reaction of grains of TCMs is described by the nucleation and nuclei growth model presented in our earlier work. The flow around grains is solved by means of the finite volume method using OpenFOAM including heat and mass transfer. Direct numerical simulations of TGA-experiments under various conditions are performed. Such simulations provide direct insight into the physics of mass and heat transport processes coupled with detailed reaction kinetics at grain scale. The numerical results are compared to the experimental results. The developed CFD model can be a promising tool to calculate the overall kinetics for dehydration reactions under realistic heat storage conditions. To that end, the effect of buoyancy should also be included in the model to get a more accurate description of convection within the sample. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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