A simulation study of airborne wear particles from laboratory wheel-rail contacts
2016 (English)In: Particuology, ISSN 1674-2001, E-ISSN 2210-4291Article in journal (Refereed) PublishedText
Laboratory measurements of airborne particles from sliding contacts are often performed using a tribometer located in a ventilation chamber. Although knowledge of particle transport behavior inside the chamber is required because it can influence the analysis of measurements, this knowledge is lacking. A numerical model was built based on the same geometry as a pin-on-disc measurement system to explain particle transport behavior inside the chamber and to determine the deviation between real amounts of generated and measured particles at the outlet. The effect of controlled flow conditions on the airflow pattern and particle transport inside the chamber was studied for different experimental conditions. Calculations show that a complex airflow pattern is formed by the spinning disc, and that it differs for each rotational speed. Simulation results reveal that particle transport in the chamber is governed mainly by the airflow pattern. The deposition velocity in the chamber was estimated and the possibility that part of the generated particles would remain in the chamber was studied. This led to an approximate estimation of particle loss rate. A comparison between experimental and simulated results with respect to the particle mass flow rate close to the outlet yields a reference factor of 0.7, which provides an indication of the difference between measured and real values.
Place, publisher, year, edition, pages
Airborne particles, Concentration, Deposition velocity, Particle loss rate, Particle transport, Concentration (process), Deposition, Airborne particle, Analysis of measurements, Approximate estimation, Deposition velocities, Experimental conditions, Laboratory measurements, Particle loss, Particle separators
IdentifiersURN: urn:nbn:se:kth:diva-187548DOI: 10.1016/j.partic.2015.09.008ScopusID: 2-s2.0-84960925718OAI: oai:DiVA.org:kth-187548DiVA: diva2:937640
QC 201606152016-06-152016-05-252016-09-07Bibliographically approved