Experimental study on the charging process of dust particles

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2025-03-15 Epub Date: 2025-01-07 DOI:10.1016/j.powtec.2025.120630

Tian-sheng Liu , Tian-Li Bo

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Abstract

In this paper, a charging property measurement system for dust particles is developed that can reflect the particle collision process during real dust events. The experimental results show that with the increase of the incident velocity (v_imp) of the impact particles and the particle size ratio (λ), the charge-to-mass ratio (q) of the impacted particle decreases. Upon comparing our results with existing experimental data, we observed that when the impacted particle is constrained, there is a possibility that the particle's q may be underestimated, and furthermore, there exists a qualitative difference in how q varies with the impact velocity (v_imp). Based on the capacitor model, this paper presents a charge model of dust particles considering the v_imp and λ. The representation equation of the parameter K_Q in the model is determined based on the experimental data using the least squares method, indicating that its representation reflects the influence of both v_imp and λ. Moreover, K_Q dominates the influence of v_imp on the q. The prediction results of the model are in good agreement with the experimental results.

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粉尘颗粒带电过程的实验研究

本文研制了一种能够反映真实粉尘事件中粉尘粒子碰撞过程的粉尘粒子电荷特性测量系统。实验结果表明，随着冲击粒子入射速度（vimp）和粒径比（λ）的增大，冲击粒子的电荷质量比(q)减小。将我们的结果与已有的实验数据进行对比，我们发现当被撞击粒子受到约束时，粒子的q有可能被低估，并且q随撞击速度（vimp）的变化也存在质的差异。在电容模型的基础上，提出了考虑vimp和λ的粉尘粒子电荷模型。基于实验数据，采用最小二乘法确定了模型中参数KQ的表示方程，表明其表示同时反映了vimp和λ的影响。KQ对vimp的影响大于KQ，模型的预测结果与实验结果吻合较好。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.