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The influence of Reynolds number variation on the instantaneous velocity and motion trajectory of microplastics in water
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Jia-chen LI1, Wei-ping LI1, Pu GUO2, Shuang-yi JING1, Zhen-yu YIN1, Zhi-chao WANG1, *
China Environmental Science | 2025, 45(12) : 6924 - 6934
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China Environmental Science | 2025, 45(12): 6924-6934
• Emerging Contaminants •
The influence of Reynolds number variation on the instantaneous velocity and motion trajectory of microplastics in water
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Jia-chen LI1, Wei-ping LI1, Pu GUO2, Shuang-yi JING1, Zhen-yu YIN1, Zhi-chao WANG1, *
Affiliations
  • 1.School of Energy and Environment, Inner Mongolia University of Science and Technology, Autonomous Region Level Ecological Protection and Comprehensive Utilization Cooperative Innovation Center for the Inner Mongolia Section of the Yellow River Basin, Baotou 014010, China
  • 2.Inner Mongolia Yellow River Dengkou Irrigation District Management Center, Baotou 014010, China
Published: 2025-12-20
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The study was initiated with the Reynolds number (Re), and three types of microplastics—polyethylene (PE), polypropylene (PP), and polystyrene (PS)—were focused on. By employing the Lagrangian method, the longitudinal instantaneous velocity and motion trajectories of microplastics in water were investigated using high-speed camera tracking and Tracker physics software, with Reynolds numbers ranging from 300 to 580 and 580 to 3500, respectively. It was observed that at very low Reynolds numbers, the motion trajectory of microplastics was approximated by a straight horizontal line, with small absolute error and standard deviation. Reynolds number reached or exceeded the critical value (575~580), transition and turbulence caused a significant increase in longitudinal instantaneous velocity. As a result, the original linear paths were deviated from by the microplastics. Overall, a normal distribution was followed by the longitudinal velocity of microplastics in water. Greater deviation from the standard normal distribution was exhibited by PS, along with more uneven instantaneous velocity fluctuations, and its travel distance in the flow direction was found to be harder to predict. In addition, the total travel distance of microplastics was increased by 0.4‰~6‰compared to straight-line motion, due to flow transition and turbulence.

microplastics  /  Reynolds number  /  instantaneous speed  /  trajectory
李嘉辰, 李卫平, 郭普, 敬双怡, 殷震育, 王志超. 雷诺数变化对水中微塑料瞬时速度及运动轨迹的影响. 中国环境科学, 2025 , 45 (12) : 6924 -6934 .
Jia-chen LI, Wei-ping LI, Pu GUO, Shuang-yi JING, Zhen-yu YIN, Zhi-chao WANG. The influence of Reynolds number variation on the instantaneous velocity and motion trajectory of microplastics in water[J]. China Environmental Science, 2025 , 45 (12) : 6924 -6934 .
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Year 2025 volume 45 Issue 12
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  • Receive Date：2025-05-12
  • Online Date：2026-10-08
  • Published：2025-12-20
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  • Received：2025-05-12
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Affiliations
    1.School of Energy and Environment, Inner Mongolia University of Science and Technology, Autonomous Region Level Ecological Protection and Comprehensive Utilization Cooperative Innovation Center for the Inner Mongolia Section of the Yellow River Basin, Baotou 014010, China
    2.Inner Mongolia Yellow River Dengkou Irrigation District Management Center, Baotou 014010, China
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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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