In situ characterization of particle structures generated at different flow velocities on a single fiber in the gas phase

Experimental Investigations of the Detachment of Different Particle Structures from a Magnetizable Fiber in the Gas Phase

“…When the axis of the fiber is oriented perpendicular to the external field, the magnetization of the fiber increases linearly in the range of the field strengths used (H = 0-30,000 A•m −1 ) [26,29]. The same fiber material was already applied in previous studies [26,27].…”

“…By using polydisperse instead of monodisperse particle material, more industry-oriented conditions are created. The generated particle structures of Carbon Black and Spheriglass have already been characterized in detail in a previous study [27]. In the previous study, the particle size distribution curves for the two materials are given.…”

“…To create dendritic particle structures, Pow Carbon 280 (Carbon Black) from Harold Scholz & Co. (Recklinghausen, Germany) was applied. Carbon Black has a volumeweighted diameter of x 50.3 = 680 nm [27]. Because of the small particle sizes, the transport of the particles to the fiber is mainly dominated by diffusion.…”

“…Spheriglass ® CB 5000 from Potters Industries Inc. (Malvern, PA, USA) was used to create much more compact structures. Due to a higher volume-weighted particle diameter of x 50.3 = 6540 nm [27], on average, tenfold the size of Carbon Black, the dominating transport mechanisms of the glass spheres to the fiber are the interception effect or inertia. The material and bulk density of Spheriglass is ρ material = 2460 kg•m −3 and ρ bulk = 1280 kg•m −3 .…”

“…As shown in a previous study [26], the particle morphology (structure) and the particle loading stage (height of the structure) are crucial for the efficiency of particle detachment. The resulting morphology depends on the prevailing transport mechanism (diffusion, interception, inertia) of the particles to the fiber during deposition [27,28]. Thus, for example, the flow resistance, the strength or porosity of the structure can influence the efficiency of the fiber regeneration.…”