A new set-up for characterisation of particle and agglomerate detachment from an elastic single fibre exposed to airflow at low velocity

L. Poggemann*, F. Klingel, J. Meyer, A. Dittler, Karlsruhe Institute of Technology (KIT), Germany

Depth filters are used in air-conditioning and cleanroom technology for removal of particles from gases. In those applications the particles deposit and accumulate inside the fibrous filter media causing an increasing separation efficiency, pressure drop and hence more energy consumption. Currently filter systems consist of a static filter structure that is not able to adapt oneself to the changing process conditions. A new elastic fibre could be an opportunity to introduce a new kind of filter systems. Those filters could adapt its mutable fibre diameter and porosity to operation conditions, like particle load, particle diameter and flow velocity, in order to attain necessary collection efficiency with minimal pressure loss and less energy consumption.

Investigations on the single fibre collection efficiency of particles and the deposited particle structure on the fibre are done with a new constructed single fibre-stretching set-up during and after a controlled stretching process. The size, number and morphology of detached particles structures are characterised by an optical particle counter with two consecutively detectors, measuring volumes and a laser band technique for bigger agglomerates. These measuring systems and the single fibre are arranged perpendicular to the direction of aerosol flow. The stretching itself is done by a fibre-mounting with piezo-actuators for controlled movement. The fibre movement is varied in stretching velocity and the number of stretching cycles. Further investigations on stacked fibres should be done in the same way. At the end, the results of the single fibre experiments should be exemplary for all the fibres within a depth filter.

Preliminary tests with an elastic single fibre and glass particles at a test stand showed that...

Session: G8 - Short Oral Presentations
Day: 23 October 2019
Time: 14:45 - 16:00 h

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