Fluidization of Fine Particles in Bubble Wakes Affects Hydrodynamics in Three-Phase Flows
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- Schlüter Michael
- Institute of Environmental Process Engineering, University of Bremen
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- Scheid Sören
- Institute of Environmental Process Engineering, University of Bremen
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- John Saskia
- Institute of Environmental Process Engineering, University of Bremen
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- Räbiger Norbert
- Institute of Environmental Process Engineering, University of Bremen
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Experiments were conducted to study the hydrodynamics of a three-phase jet-loop-reactor with liquid as a continuous phase. By using a perspex flow channel with a special geometry and different optical measuring systems the simultaneous measurement of the flow field as well as of the movement of bubbles and solids in three-phase flows was possible. In order to measure the distribution and movement of fine, suspended solids (ρsolid = 2400 kg/m3, dP =150 μm; 500 μm) within the bubble wakes, a specific fraction of particles was coated by a fluorescent dye. This made it possible to track single particles even at solid concentrations up to 10% by the use of an optical filter. The results indicates that the rise velocity of bubbles in three-phase flows depends on the accumulation of solid particles in bubble wakes due to the inertia of the solids. Particles which are able to follow the wake structure will increase the mass force acting on a bubble due to a higher suspension density of the wake with the consequence of a lower relative velocity. The decrease in relative bubble velocity influences the pressure drop and circulation velocity on loop reactors. Based on the measured results and the analyses of the forces acting on the bubble a model was developed which predicts the relative bubble velocity reasonably well.
収録刊行物
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- JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
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JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 37 (8), 947-954, 2004
公益社団法人 化学工学会
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詳細情報 詳細情報について
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- CRID
- 1390001204568647936
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- NII論文ID
- 80016836598
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- NII書誌ID
- AA00709658
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- ISSN
- 18811299
- 00219592
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- NDL書誌ID
- 7051371
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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