Deposit formation poses severe hazards and negatively affects the functionality of pneumatic powder transport systems. A novel test-rig was developed for the measurement of the deposition of polymethylmethacrylate powder in a horizontal, turbulent flow through a duct of a square cross-section. The parameters under investigation are the particles’ size, shape, and mass flow rate, the conveying air’s Reynolds number, relative humidity, and temperature, and the duct material. A continuous weighing method is used to quantify the particle deposition and resuspension rate and a Faraday cup is positioned at the duct outlet to measure the specific powder charge. For the considered conditions, the air humidity exhibits a strong influence, especially on the smallest particles. For small particles, a high charge even leads to deposition at the ceiling of the PC duct. Larger particles tend to settle at the center of the duct and smaller ones preferably at its corner.

沉积物的形成会带来严重的危害，并对气动粉末传输系统的功能产生负面影响。开发了一种新颖的试验装置，用于测量通过方形横截面导管的水平湍流中聚甲基丙烯酸甲酯粉末的沉积。研究的参数是颗粒的大小，形状和质量流量，输送空气的雷诺数，相对湿度和温度以及管道材料。使用连续称量法来量化颗粒的沉积和再悬浮速率，并将法拉第杯放置在管道出口处以测量比粉末装料量。在考虑的条件下，空气湿度表现出强烈的影响，尤其是对最小的颗粒。对于小颗粒，高电荷甚至会导致沉积在PC导管的顶部。较大的颗粒倾向于沉积在管道的中心，较小的颗粒倾向于沉积在其角。