Population balance modeling for the growth of agglomerates via primary and secondary agglomeration in gas-fluidized beds
| Autor: | Konstantin Pougatch, Dana Grecov, Jennifer McMillan, John R. Grace, Lalit Kumar, Martha Salcudean |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Collision
Materials science Equations General Chemical Engineering Population Flows 02 engineering and technology Ansys fluent Aggregation Viscosity Population Balance Modeling 020401 chemical engineering 0204 chemical engineering Composite material education Kinetic-Theory Primary Agglomeration education.field_of_study Waste management Economies of agglomeration Agglomeration 021001 nanoscience & nanotechnology Fluidized Bed Particles Fluidized bed Agglomerate Nucleation Wet Granulation 0210 nano-technology Stability Secondary Agglomeration Layer (electronics) Discretization Asperity (materials science) |
| Zdroj: | Powder Technology. 321:499-513 |
| ISSN: | 0032-5910 |
| DOI: | 10.1016/j.powtec.2017.08.016 |
| Popis: | A population balance model is developed for the growth of pre-formed agglomerates in a fluidized bed with several agglomeration mechanisms considered. Primary agglomeration takes place when dry particles collide with the wet surface of the original agglomerate. Secondary agglomeration occurs either by wet particles colliding with the dry surface of agglomerates, or by liquid migration to the top layer of an agglomerate and subsequent collisions with dry particles. The properties of the liquid binder determine the dominant mechanism. The new agglomeration model for high-and low-viscosity liquid binders is implemented in ANSYS FLUENT commercial software. Model predictions agree reasonably well with available experimental results without altering the previously published parameters of the sub-models employed. It is found that the viscosity of the liquid binder and surface asperities play notable roles in the agglomeration. Surface asperities are especially important when asperity heights are of the same order as the thickness of the liquid film. (C) 2017 Published by Elsevier B.V. |
| Databáze: | OpenAIRE |
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