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The coupling relationships between vented pressures and flames of micro- and nano-PMMA particles at elevated static activation overpressures were examined using the standard 20-L spherical dust explosion venting apparatus to reveal the differences of venting processes at different particle scales. It was found that by increasing the venting diameter or decreasing the static activation pressure, the...
Vented 100nm and 800nm polymethyl methacrylate (PMMA) dust explosions were conducted in the standard 20L spherical chamber with different venting diameters. During the pretty high pressure dust explosion airflow was vented out, the highly under-expanded jet flame with an appearance of “Mach disk” was formed. When the pressure and explosion airflow velocity gradually decreased, the highly under-expanding...
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