The detachment of particle structures from a stiff single fiber exposed to an airflow has been investigated by (Jankowska et al., 2000; Larsen, 1958; Löffler, 1972; Przekop et al., 2004; Qian et al., 1997; Zoller et al., 2020). In order to detach particle piles from a stiff single fiber, airflow velocities above 1.2 m/s are required. While these values are well above typical operational parameter for depth filters, a shift toward lower velocities for detachment would offer both up-and downside for filter operation. One possible application for controlled structure detachment from a filter fiber at lower velocities would be a shift of separated particulate structures from the upper layers of depth filter into lower regions. The result would be additional void space from particle deposition. Currently there is no knowledge available, if fiber stretching could enable such detachment of particle structure fragments at an operation airflow velocity below 1 m/s. It is assumed that fiber stretching might introduce shear and tensile stress to the particulate structures. That may lead to first cracks and promote final detachment. This study examines the behavior of particle structure fragments on an elastic single fiber for the first time. The fiber is loaded with a compact particle structure in a loading chamber. Glass spheres served as inert particulate material. A new customized fiber-mounting device was designed for the stretching procedure of 22 mm (55%) length. In first experiments, the fiber was stretched without an airflow. Stretching at an elongation rate of 0.4 mm/s caused re-arrangement, crack formation and rotation of the fiber. No detachment of particle structure fragments is observed. If the fiber is stretched and exposed to an airflow at 0.8 m/s, particles structure fragments re-arranged and subsequently detached. In further experiments at an elongation rate of 1.2 mm/s, intensive detachment is observed at an increase of superficial airflow velocity from 0.4 m/s to 0.8 m/s. In total, this reveals that fiber stretching enables detachment of particle structure fragments from a single fiber exposed to an airflow at superficial velocities below 1 m/s. The potential application of elastic fibers in a filter system will have the aim to delay increasing filter backpressure. This effect could be caused by the transport of particulate matter towards areas of lower loading further downstream while maintaining a high level of separation efficiency at operational filtration velocities.

（Jankowska et al。，2000; Larsen，1958;Löffler，1972; Przekop et al。，2004; Qian et al。，1997; Zoller et al。等（2020年）。为了从刚性单纤维上分离颗粒堆，需要高于1.2 m / s的气流速度。虽然这些值远高于深层过滤器的典型运行参数，但向较低速度移动的拆卸将为过滤器的运行提供上下两个方面。在较低速度下从过滤器纤维上分离结构的一种可能的应用方法是将分离的颗粒结构从深度过滤器的上层转移到下部区域。结果将是粒子沉积产生额外的空隙空间。目前没有可用的知识，如果纤维拉伸可以在低于1 m / s的工作气流速度下实现这种颗粒结构碎片的分离。假定纤维拉伸可能会向颗粒结构引入剪切应力和拉伸应力。这可能导致第一道裂缝并促进最终脱离。这项研究首次检查了弹性单纤维上颗粒结构碎片的行为。纤维在装载室中装载有紧密的颗粒结构。玻璃球用作惰性颗粒材料。设计了一种新的定制光纤安装设备，用于22毫米（55％）长度的拉伸过程。在第一个实验中，纤维在没有气流的情况下被拉伸。以0.4mm / s的伸长率拉伸引起纤维的重新排列，裂纹形成和旋转。没有观察到颗粒结构碎片的分离。如果将纤维拉伸并以0.8 m / s的速度暴露在气流中，则颗粒结构碎片会重新排列并随后分离。在进一步的实验中，以1.2 mm / s的伸长率观察到，表观气流速度从0.4 m / s增加到0.8 m / s时，出现了强烈的分离。总的来说，这表明纤维拉伸能够以低于1 m / s的表观速度从暴露于气流的单根纤维中分离出颗粒结构碎片。弹性纤维在过滤器系统中的潜在应用将旨在延迟增加过滤器背压。