Affiliations: [a] College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, China
| [b] International Water, Air and Soil Conservation Society INWASCON Kuala Lumpur, Malaysia
Correspondence:
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Corresponding author. Shuihua Zheng, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China. E-mail: [email protected].
Abstract: In this paper, the changes of suspended concentration of particles with different particle sizes were studied in different speed and height. Indoor human activities can cause resuspension of particles. In this paper, a miniature room model is adopted, using electric draw stem to control the forward movement of the footstep and the upper and lower motion to study the influence of different footstep motions in the small space on the resuspension of particles. There are three kinds of speeds, including 0.05 m/s, 0.1 m/s, 0.15 m/s, and three kinds of lifting height, including 0.06 m, 0.12 m, 0.18 m. Suspended ratio rp value in the range of 0–10–6, when lifting heights are 0.06 m or 0.12 m, and speed is increasing, the particles suspension rate continuous growth, when lifting height is 0.18 m, particulate suspension rate presents the trend of increased and then reduced. When speeds are 0.05 m/s or 0.1 m/s, with lifting height increasing, the particles suspension rate increase. When speeds is 0.15 m/s, with lifting height increasing, particulate matter suspended the first rise and fall, including PM10 suspension rate has been a declining trend.
Keywords: Particles matter, footstep motion, suspension rate, resuspension, small box