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Quantifying the effect of strong ignition sources on particle preconditioning and distribution in the 20-L chamber
journal contributionposted on 2023-05-18, 03:14 authored by Cloney, CT, Ripley, RC, Amyotte, PR, Faisal KhanFaisal Khan
Computational fluid dynamics is used to investigate the preconditioning aspect of overdriving in dust explosion testing. The results show that preconditioning alters both the particle temperature and distribution prior toflamepropagation in the 20-L chamber. A parametric study gives thefluid pressure and temperature, and particle temperature and concentration at an assumed flame kernel development time (10 ms) for varying ignitor size and particle diameter. For the 10 kJ ignitor with 50% efficiency, polyethylene particles under 50 μm reach 400 K and may melt prior to flame propagation. Gases from the ignitor detonation displace the dust from the center of the chamber and may increase local particle concentration up to two times thenominal value being tested. These effects have importantimplications for explosive testing of dusts in the 20-L chamber and comparing to larger 1-m3 testing, where these effects may be negligible.
Publication titleJournal of Loss Prevention in the Process Industries
Department/SchoolAustralian Maritime College
PublisherElsevier Sci Ltd
Place of publicationThe Boulevard, Langford Lane, Kidlington, Oxford, England, Oxon, Ox5 1Gb