https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54044 Tue 30 Jan 2024 13:50:18 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52546 Tue 17 Oct 2023 15:19:51 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30286 80%. The MAIT of four different coal dust samples (Australian coal) with particle sizes below 212 µm and dust layer thicknesses of 5, 12 and 15 mm were measured using a dust layer auto ignition temperature apparatus in accordance with the ASTM E2021 standard. It was concluded that the MAIT of the coal dust layer significantly decreases with decreasing particle size. The MAIT for the coal samples with a smaller D50 size were observed to be lower in comparison with samples with a larger D50 size. The dust layer thickness was shown to significantly impact on the MAIT. The MAIT increased proportionally with the increasing thickness of the coal dust layer. The effect of the coal dust moisture content and humidity on the MAIT for compacted dust layers was noticeable, whereas, this effect was less important with loose dust layers. In addition, this work investigated and compared the MAIT for a typical coal dust sample based on the existing ASTM and International Electrotechnical Commission (IEC) standard procedures for ignition of coal dust layers.]]> Sat 24 Mar 2018 07:33:35 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29996 st) and explosive region of hybrid fuel mixtures present in Ventilation Air Methane (VAM) were investigated. Experiments were carried out according to the ASTM E1226-12 guideline utilising a 20 L spherical shape apparatus specifically designed for this purpose. Results: obtained from this study have shown that the presence of methane significantly affects explosion characteristics of coal dust clouds. Dilute concentrations of methane, 0.75-1.25%, resulted in coal dust clouds OPR increasing from 0.3 bar to 2.2 bar and boosting the K_st value from 10 bar m s^-1 to 25 bar m s^-1. The explosion characteristics were also affected by the ignitors' energy; for instance, for a coal dust cloud concentration of 50 g m^-3 the OPR recorded was 0.09 bar when a 1 kJ chemical ignitor was used, while, 0.75 bar (OPR) was recorded when a 10 kJ chemical ignitor was used.For the first time, new explosion regions were identified for diluted methane-coal dust cloud mixtures when using 1, 5 and 10 kJ ignitors. Finally, the Le-Chatelier mixing rule was modified to predict the lower explosion limit of methane-coal dust cloud hybrid mixtures considering the energy of the ignitors.]]> Sat 24 Mar 2018 07:28:52 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36498 Fri 22 May 2020 15:46:02 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36779 Fri 03 Jul 2020 17:08:42 AEST ]]>