Direct numerical simulations and experiments of a pseudo-2D gas-fluidized bed
| العنوان: | Direct numerical simulations and experiments of a pseudo-2D gas-fluidized bed |
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| المؤلفون: | Jam Hans Kuipers, Y Yali Tang, NG Niels Deen, YM Yuk Man Lau, Eajf Frank Peters |
| المساهمون: | Multi-scale Modelling of Multi-phase Flows, Group Deen |
| المصدر: | Chemical Engineering Science 143(2016), 166-180 Chemical Engineering Science, 143, 166-180. Elsevier |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | DNS, General Chemical Engineering, Flow (psychology), 02 engineering and technology, Industrial and Manufacturing Engineering, Physics::Fluid Dynamics, 020401 chemical engineering, DIA, Fluidization, Particle velocity, 0204 chemical engineering, Gas-fluidized bed, Physics, Applied Mathematics, General Chemistry, Mechanics, Immersed boundary method, 021001 nanoscience & nanotechnology, PIV, Classical mechanics, Particle image velocimetry, Fluidized bed, Particle, Liquid bubble, 0210 nano-technology, Granular temperature |
| الوصف: | This paper reports our study on fluidization of 5000 spherical particles in a pseudo-2D gas-fluidized bed by direct numerical simulations (DNS) and experiments as well. Simulations are performed using an immersed boundary method, together with the methodology developed in our earlier work for accurate prediction of gas–solid interactions at relatively low grid resolutions. This modelling approach provides detailed information on the gas flow and the motion of individual particles, which allows for a priori calculation of the bed hydrodynamics. Experimental measurements of solids mean motion are conducted using a combined technique of Particle Image Velocimetry (PIV) and Digital Image Analysis (DIA). Fur- ther, the PIV technique is extended and applied for instantaneous measurements of the particle granular temperature, which is the key characteristics of particle velocity fluctuations. For the first time, this paper reports a direct comparison in great detail between DNS results and experimental data for realistic gas fluidization. The detailed comparison reveals a reasonably good agreement with respect to the time-averaged solids motion and the pressure fluctuations. In addition, the granular temperatures calculated from the simulations agree well with the experimental data, but provide more details with respect to the variations corresponding to bubble formation and eruption. From our investigation, it also becomes clear that attention should be paid on the measurement and interpretation of the granular temperature. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 0009-2509 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4deedf4104f10ee74a6d23d91456d6a8 https://doi.org/10.1016/j.ces.2015.12.026 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....4deedf4104f10ee74a6d23d91456d6a8 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00092509 |
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