Experimental Investigation of Reactive-Inert Particulate Matter Detachment from Metal Fibres at Low Flow Velocities and
- PDF / 2,095,926 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 101 Downloads / 193 Views
ORIGINAL PAPER
Experimental Investigation of Reactive‑Inert Particulate Matter Detachment from Metal Fibres at Low Flow Velocities and Different Gas Temperatures Julian Zoller1 · Amin Zargaran2 · Kamil Braschke2 · Jörg Meyer1 · Uwe Janoske2 · Achim Dittler1 Received: 22 June 2020 / Revised: 22 October 2020 / Accepted: 26 October 2020 © The Author(s) 2020
Abstract The detachment of particle structures from single fibres in gas flow has been investigated only for inert particle structures yet. This study investigates the detachment of particle structures containing reactive components. These reactive components disappear during the reaction and enhance detachment at low flow velocities. Soot was used as the reactive component and glass spheres as the inert component of the particle structure. The soot disappears due to combustion with oxygen leaving only the glass spheres on the fibre. Without reaction, the detachment phenomenon was observed at superficial flow velocities above 1.9 m/s and with reaction at 0.5 m/s. This shows that reacting and disappearing components of the particle structure can enhance detachment. Keywords Detachment · Reaction · Fibre · Particle structure · Re-entrainment
1 Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s41810-020-00081-3) contains supplementary material, which is available to authorized users. * Julian Zoller [email protected]; [email protected] Amin Zargaran zargaran@uni‑wuppertal.de Kamil Braschke braschke@uni‑wuppertal.de Jörg Meyer [email protected] Uwe Janoske janoske@uni‑wuppertal.de Achim Dittler [email protected] 1
Institute of Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology, Straße am Forum 8, 76131 Karlsruhe, Germany
School of Mechanical Engineering and Safety Engineering, Chair of Fluid Mechanics, Bergische Universität Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany
2
The detachment of particles and particle structures from a single filter fibre was first investigated by Löffler. Löffler showed that gas flow velocities above 10 m/s are necessary to detach more than 50% of single 10-µm glass spheres from a single polyamide fibre of 50-µm diameter. An increasing flow velocity during particle deposition on the fibre and fixed primary particle layers both increase the velocity, necessary for detachment. For piles of particles, first detachment phenomena were observed at 1.2 m/s. (Löffler 1972). Following Löffler, only few researchers investigated the detachment of particles from fibres, because common flow velocities in fibrous filters are below the velocities necessary for detachment. The reason for the lower flow velocities in filter applications is the reduction of particle bounce (Maus et al. 1996), and hence an increase in particle deposition efficiency (Rembor et al. 1999). These researchers mainly investigated applications, in which even the detachment of small amounts of particles is of relevance. Qian et al. (1997) studied the release of path
Data Loading...
