Three‐component solids velocity measurements in the outlet section of a riser
| Autor: | Geraldine Heynderickx, Maria N. Pantzali, Guy Marin, Javier Marques de Marino |
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| Rok vydání: | 2016 |
| Předmět: |
Environmental Engineering
Particle Technology and Fluidization fluid mechanics multiphase flow General Chemical Engineering riser 02 engineering and technology Physics::Fluid Dynamics Momentum 020401 chemical engineering Streamlines streaklines and pathlines Geotechnical engineering Particle velocity 0204 chemical engineering Physics Multiphase flow Fluid mechanics Mechanics 021001 nanoscience & nanotechnology Vortex Shear (sheet metal) hydrodynamics Turbulence kinetic energy fluidization 0210 nano-technology Biotechnology |
| Zdroj: | Aiche Journal. American Institute of Chemical Engineers |
| ISSN: | 1547-5905 0001-1541 |
| DOI: | 10.1002/aic.15277 |
| Popis: | Coincident (simultaneous) three‐component particle velocity measurements performed using two laser Doppler anemometry probes at the outlet section of a 9 m high cylindrical riser are for the first time presented for dilute flow conditions. Near the blinded extension of the T‐outlet a solids vortex is formed. Particle downflow along the riser wall opposite the outlet tube is observed, which is restricted to higher riser heights at higher gas flow rates. Increased velocity fluctuations are observed in the solids vortex and downflow region as well as at heights corresponding to the outlet tube. Contrary to the rest of the riser, in the downflow region time and ensemble velocity averages are not equal. Given the local bending of the streamlines, axial momentum transforms to radial and azimuthal momentum giving rise to the corresponding shear stresses. Turbulence intensity values indicate the edges of the downflow region. © 2016 The Authors AIChE Journal published by Wiley Periodicals, Inc. on behalf of American Institute of Chemical Engineers AIChE J, 62: 3575–3584, 2016 |
| Databáze: | OpenAIRE |
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