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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Characterizing the effect of surface morphology on particle-wall interaction by the airflow method
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Characterizing the effect of surface morphology on particle-wall interaction by the airflow method

机译：用气流法表征表面形态对颗粒-壁相互作用的影响

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摘要

Particle-wall interaction has been studied by the airflow method. The particles used were micrometer-size polymethyl methacrylate (PMMA) spheres treated with an additive, i.e. nanometer-size TiO_2, Al_2O_3 or SiO_2 particles. The method for the treatment was dry particle coating based on mechanofusion or simple mixing through shaking manually. The surface morphology of the PMMA particles was modified by changing the species of additives, its concentration and the treat-ment method. The particles after treatment were dispersed on the surface of a flat metal piece and an experiment on particle entrainment was carried out in an airflow channel to evaluate particle-wall in-teraction. Relationships between particle entrainment efficiency and air velocity, which corresponds to the distribution of the particle-wall interaction force, were obtained under various conditions, showing that the particle-wall interaction force tends to decrease with the increase in the concentration of added nanoparticles. Furthermore, analysis of the experimental results showed that the main factor affecting the particle-wall interaction force was the actual surface morphology of the particles after treatment.
机译：通过气流法研究了颗粒-壁之间的相互作用。所使用的颗粒是用添加剂处理的微米级的聚甲基丙烯酸甲酯（PMMA）球，即纳米级的TiO_2，Al_2O_3或SiO_2颗粒。处理的方法是基于机械融合的干颗粒包衣或通过手动摇动简单混合。通过改变添加剂的种类，其浓度和处理方法，可以改变PMMA颗粒的表面形态。将处理后的颗粒分散在平坦的金属片的表面上，并在气流通道中进行颗粒夹带实验以评估颗粒-壁间的相互作用。在各种条件下，得到了夹带效率与风速之间的关系，其对应于壁-壁相互作用力的分布，表明随着添加纳米粒子浓度的增加，壁-壁相互作用力趋于减小。此外，对实验结果的分析表明，影响颗粒-壁相互作用力的主要因素是处理后颗粒的实际表面形态。

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