Revisit of the wall effect on the settling of cylindrical particles in the inertial regime

Raymond Lau; Meer Saiful Hassan; Wenyin Wong; Tao Chen

doi:10.1021/ie1012807

Revisit of the wall effect on the settling of cylindrical particles in the inertial regime

Raymond Lau^*, Meer Saiful Hassan, Wenyin Wong, Tao Chen

^*Corresponding author for this work

Nanyang Technological University

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

The wall effect on the settling of cylindrical particles in the inertial regime is revisited. This study covers particle Reynolds number from 600 to 16 100 and particle-length-to-diameter ratios (l/d) from 4 to 21. The wall factor (U_t/U_t,â̂) is found to decrease initially as the particle-to-column diameter ratio (d/D) increases. When the wall effect becomes significant, U_t/U_t,â̂ starts to increase with an increase in d/D due to a change of the particle orientation during settling. After U_t/U_t,â̂ reaches a maximum, it decreases to 0 when d/D increases to 1. A semiempirical model is developed to predict the wall effect of settling of cylindrical particles over the whole range of d/D. The model shows good prediction to the experimental results and matches the wall factor models developed for spherical particles when l/d approaches 1.

Original language	English
Pages (from-to)	8870-8876
Number of pages	7
Journal	Industrial and Engineering Chemistry Research
Volume	49
Issue number	18
DOIs	https://doi.org/10.1021/ie1012807
Publication status	Published - Sept 15 2010
Externally published	Yes

ASJC Scopus Subject Areas

General Chemistry
General Chemical Engineering
Industrial and Manufacturing Engineering

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10.1021/ie1012807

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title = "Revisit of the wall effect on the settling of cylindrical particles in the inertial regime",

abstract = "The wall effect on the settling of cylindrical particles in the inertial regime is revisited. This study covers particle Reynolds number from 600 to 16 100 and particle-length-to-diameter ratios (l/d) from 4 to 21. The wall factor (Ut/Ut,{\^a}̂) is found to decrease initially as the particle-to-column diameter ratio (d/D) increases. When the wall effect becomes significant, Ut/Ut,{\^a}̂ starts to increase with an increase in d/D due to a change of the particle orientation during settling. After Ut/Ut,{\^a}̂ reaches a maximum, it decreases to 0 when d/D increases to 1. A semiempirical model is developed to predict the wall effect of settling of cylindrical particles over the whole range of d/D. The model shows good prediction to the experimental results and matches the wall factor models developed for spherical particles when l/d approaches 1.",

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T1 - Revisit of the wall effect on the settling of cylindrical particles in the inertial regime

AU - Lau, Raymond

AU - Hassan, Meer Saiful

AU - Wong, Wenyin

AU - Chen, Tao

PY - 2010/9/15

Y1 - 2010/9/15

N2 - The wall effect on the settling of cylindrical particles in the inertial regime is revisited. This study covers particle Reynolds number from 600 to 16 100 and particle-length-to-diameter ratios (l/d) from 4 to 21. The wall factor (Ut/Ut,â̂) is found to decrease initially as the particle-to-column diameter ratio (d/D) increases. When the wall effect becomes significant, Ut/Ut,â̂ starts to increase with an increase in d/D due to a change of the particle orientation during settling. After Ut/Ut,â̂ reaches a maximum, it decreases to 0 when d/D increases to 1. A semiempirical model is developed to predict the wall effect of settling of cylindrical particles over the whole range of d/D. The model shows good prediction to the experimental results and matches the wall factor models developed for spherical particles when l/d approaches 1.

AB - The wall effect on the settling of cylindrical particles in the inertial regime is revisited. This study covers particle Reynolds number from 600 to 16 100 and particle-length-to-diameter ratios (l/d) from 4 to 21. The wall factor (Ut/Ut,â̂) is found to decrease initially as the particle-to-column diameter ratio (d/D) increases. When the wall effect becomes significant, Ut/Ut,â̂ starts to increase with an increase in d/D due to a change of the particle orientation during settling. After Ut/Ut,â̂ reaches a maximum, it decreases to 0 when d/D increases to 1. A semiempirical model is developed to predict the wall effect of settling of cylindrical particles over the whole range of d/D. The model shows good prediction to the experimental results and matches the wall factor models developed for spherical particles when l/d approaches 1.

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Revisit of the wall effect on the settling of cylindrical particles in the inertial regime

Abstract

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