Abstract
Jetting fluidized beds are widely used in industries for mixing of granular materials. The mixing efficiency is affected significantly by the number of jets and their locations. In this work, discrete particle model is used to simulate fluidized beds with different jet numbers, and the results are validated by physical experiments. Cases with different jet numbers (varying from one to five) but the same gas flow rates are compared in terms of the maximum bed pressure drop, bed height, mixing index, particle velocities and contact number. The results show that different jet numbers result in different flow patterns, which severely affect the mixing efficiency. The mixing efficiency in the one-jet case (spouted-bed) is 1.5–3 times higher than other cases due to a higher jet velocity and umbrella-type flow pattern. For the multiple jets, bubbles and vortex can form and promote particle mixing but not as efficient as the case of one jet. However, particle contacts in multiple jet cases is more uniform than the one-jet case. This implies that from the perspective of particle heat transfer, multiple jets can behave better than one jet.
| Original language | English |
|---|---|
| Number of pages | 11 |
| Journal | Powder Technology |
| DOIs | |
| Publication status | Accepted/In press - 8 Aug 2019 |
Keywords
- Discrete particle modelling
- Jetting fluidized bed
- Mixing index
- Multiple jets
Cite this
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CFD-DEM modelling of mixing of granular materials in multiple jets fluidized beds. / Liu, Runjia; Zhou, Zongyan; Xiao, Rui; Yu, Aibing.
In: Powder Technology, 08.08.2019.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - CFD-DEM modelling of mixing of granular materials in multiple jets fluidized beds
AU - Liu, Runjia
AU - Zhou, Zongyan
AU - Xiao, Rui
AU - Yu, Aibing
PY - 2019/8/8
Y1 - 2019/8/8
N2 - Jetting fluidized beds are widely used in industries for mixing of granular materials. The mixing efficiency is affected significantly by the number of jets and their locations. In this work, discrete particle model is used to simulate fluidized beds with different jet numbers, and the results are validated by physical experiments. Cases with different jet numbers (varying from one to five) but the same gas flow rates are compared in terms of the maximum bed pressure drop, bed height, mixing index, particle velocities and contact number. The results show that different jet numbers result in different flow patterns, which severely affect the mixing efficiency. The mixing efficiency in the one-jet case (spouted-bed) is 1.5–3 times higher than other cases due to a higher jet velocity and umbrella-type flow pattern. For the multiple jets, bubbles and vortex can form and promote particle mixing but not as efficient as the case of one jet. However, particle contacts in multiple jet cases is more uniform than the one-jet case. This implies that from the perspective of particle heat transfer, multiple jets can behave better than one jet.
AB - Jetting fluidized beds are widely used in industries for mixing of granular materials. The mixing efficiency is affected significantly by the number of jets and their locations. In this work, discrete particle model is used to simulate fluidized beds with different jet numbers, and the results are validated by physical experiments. Cases with different jet numbers (varying from one to five) but the same gas flow rates are compared in terms of the maximum bed pressure drop, bed height, mixing index, particle velocities and contact number. The results show that different jet numbers result in different flow patterns, which severely affect the mixing efficiency. The mixing efficiency in the one-jet case (spouted-bed) is 1.5–3 times higher than other cases due to a higher jet velocity and umbrella-type flow pattern. For the multiple jets, bubbles and vortex can form and promote particle mixing but not as efficient as the case of one jet. However, particle contacts in multiple jet cases is more uniform than the one-jet case. This implies that from the perspective of particle heat transfer, multiple jets can behave better than one jet.
KW - Discrete particle modelling
KW - Jetting fluidized bed
KW - Mixing index
KW - Multiple jets
UR - http://www.scopus.com/inward/record.url?scp=85070497695&partnerID=8YFLogxK
U2 - 10.1016/j.powtec.2019.08.002
DO - 10.1016/j.powtec.2019.08.002
M3 - Article
JO - Powder Technology
JF - Powder Technology
SN - 0032-5910
ER -