Drag coefficient on particle agglomerates: a CFD study with experimental validation
The formation of irregularly shaped particle agglomerates is a recurring phenomenon observed in equipment with particle-laden flows, which directly interferes in the flow profile, due to drag effects. To observe the capability of computational fluid dynamics to predict the drag coefficient in partic...
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| Published in: | Journal of the Brazilian Society of Mechanical Sciences and Engineering Vol. 45; no. 9 |
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| Main Authors: | , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Berlin/Heidelberg
Springer Berlin Heidelberg
01-09-2023
Springer Nature B.V |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | The formation of irregularly shaped particle agglomerates is a recurring phenomenon observed in equipment with particle-laden flows, which directly interferes in the flow profile, due to drag effects. To observe the capability of computational fluid dynamics to predict the drag coefficient in particle agglomerates, laboratory experiments were performed, aiming the validation of simulations. Experimental assays were performed to obtain both the fluids’ properties and the terminal velocities of the particle agglomerates. To evaluate the drag coefficient, simulations were carried out at steady state for the experimental conditions and the results were compared. Simulations presented good agreement with the experimental assays, with most of deviations lower than ±10%. Simulations of the agglomerates of four and five particles falling in water presented higher deviations,
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12.73% and
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19.92%, respectively. Higher deviations are expected in these agglomerates due to the difficulties to represent the wake region in the rear of the agglomerates, observed in flows with Reynolds number greater than 1000. |
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| ISSN: | 1678-5878 1806-3691 |
| DOI: | 10.1007/s40430-023-04366-9 |