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Settling dynamics of micro-sized char and coal powders: An experimental study
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Wenyu Tua, Peilin Tiana, Liang-Liang Fanb, *, Liang Zhaoa, **
Particuology | 2026, 115 : 356 - 365
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Particuology | 2026, 115: 356-365
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Settling dynamics of micro-sized char and coal powders: An experimental study
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Wenyu Tua, Peilin Tiana, Liang-Liang Fanb, *, Liang Zhaoa, **
Affiliations
  • aState Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
  • bSchool of Instrument Science and Technology, Xi'an Jiaotong University, Xi'an, 710049, China
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1

These authors contributed equally to this work.

Published: 2026-08-10 doi: 10.1016/j.partic.2026.05.022
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Char particles from coal pyrolysis exhibit unique settling dynamics, such as terminal velocity and drag coefficient. Accurate quantification of drag characteristics is essential for pneumatic conveying. Current simulations adopting spherical drag models suffer large deviations for irregular char particles. To fill this gap, we built a visual platform to investigate free settling of coal and char particles (<200 μm). Terminal velocities were measured for individual particles and aggregates. Based on statistical analysis, we revised Stokes and Schiller drag formulations. In the Stokes form, the fitted coefficients for individual coal particles and coal aggregates are 26.04 ± 3.5 and 52.15 ± 4.8, respectively; for individual char particles and char aggregates, they are 41.05 ± 3.2 and 112.4 ± 4.3, respectively. In the Schiller form, the fitted coefficients for individual coal particles and coal aggregates are 26.19 ± 3.4 and 53.88 ± 4.2, respectively; for individual char particles and char aggregates, they are 40.94 ± 3.2 and 111.1 ± 4.2, respectively. These correlations can be directly employed in drag model for numerical simulation of char pneumatic conveying. Validation shows significantly improved accuracy. This work presents the first experimentally derived drag coefficient correlations for char particles, addressing the lack of quantitative data and offering a more precise tool for char transport design.

Settling dynamics  /  Char powder  /  Coal powder  /  Drag coefficient  /  Settling velocity
Wenyu Tu, Peilin Tian, Liang-Liang Fan, Liang Zhao. Settling dynamics of micro-sized char and coal powders: An experimental study[J]. Particuology, 2026 , 115 : 356 -365 . DOI: 10.1016/j.partic.2026.05.022
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Funding
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  • Shaanxi Provincial Natural Science Foundation Research Program Shaanxi Coal Joint Funding(2021JLM-21)
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Year 2026 volume 115 Issue 0
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Article Info
doi: 10.1016/j.partic.2026.05.022
  • Receive Date：2026-02-03
  • Online Date：2026-08-20
  • Published：2026-08-10
Article Data
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History
  • Received：2026-02-03
  • Revised：2026-05-17
  • Accepted：2026-05-29
Funding
Shaanxi Provincial Natural Science Foundation Research Program Shaanxi Coal Joint Funding(2021JLM-21)
Affiliations
    aState Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
    bSchool of Instrument Science and Technology, Xi'an Jiaotong University, Xi'an, 710049, China

Corresponding:

* E-mail addresses: (L.-L. Fan)
** (L. Zhao).
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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