Poly-dispersed particle resuspension by turbulent airflow was experimentally studied in a wind tunnel called BISE. The set-up was carefully validated to produce reference airflows with three absolute pressures and friction velocities values. Monolayer deposits of poly-dispersed tungsten particles on tungsten surfaces were used for the experiments. The fraction of detached particles by size bin from 1 μm to 50 μm was quantified to analyze the effects of friction velocity, absolute pressure and particles concentration on surface. Comparison of the results with Rock'n Roll and Monte-Carlo resuspension modeling revealed discrepancies for particles behavior with diameter below 4.5 μm. These discrepancies could not be understood by assessment of particle-surface adhesion force distribution carried out with Atomic Force Microscopy analysis. For particle surface concentrations ranging from 35 to 100 mm⁻², a collision effect was identified due to the concentration and poly-dispersion of particles deposited on the surface. Indeed, when analyzing the experimental data, a good linear correlation is obtained between the fraction of the small particles detached and a collision parameter, demonstrating that collisions could be responsible for the unexpectedly high resuspended fraction observed for particle size below 4.5 μm in diameter. The experimental data and the analysis presented in the paper show that particle surface concentration and collision effects are clearly relevant and should be considered in the above-mentioned resuspension models, especially for poly-dispersed particles assessment.

在称为BISE的风洞中对湍流引起的多分散颗粒重悬浮进行了实验研究。经过仔细验证的设置可产生具有三个绝对压力和摩擦速度值的参考气流。在钨表面上多分散钨颗粒的单层沉积物用于实验。量化从尺寸为1μm到50μm的分离颗粒的比例，以分析摩擦速度，绝对压力和颗粒浓度对表面的影响。将结果与Rock'n Roll和Monte-Carlo重悬模型进行比较，发现直径小于4.5μm的颗粒行为存在差异。通过使用原子力显微镜分析进行的颗粒表面粘附力分布评估无法理解这些差异。^-2，由于沉积在表面上的颗粒的浓度和多分散性，确定了碰撞效果。确实，当分析实验数据时，在分离的小颗粒的分数与碰撞参数之间获得了良好的线性相关性，表明对于直径小于4.5μm的粒径，碰撞可能是观察到的意外重悬的分数的原因。本文提供的实验数据和分析表明，颗粒表面浓度和碰撞效应具有明显的相关性，应在上述重悬模型中加以考虑，尤其是在多分散颗粒评估中。