Dust Explosion Characteristics of Agglomerated 35 nm and 100 nm Aluminum Particles

Table 1

The specifications for the aluminum powders.

Chemical code	Al-35 nm	Al-100 nm
True density	2.7 g/cm^3	2.7 g/cm^3
Bulk density	0.09 g/cm^3	0.14 g/cm^3
Packing degree	0.033	0.052
Diameter range	20~50 nm^a	90~110 nm^a
Average diameter	35 nm^a	100 nm^a
Shape	spherical structure^a	spherical structure^a
Agglomeration diameter	161 nm^b	167 nm^b

Note: ^aThe particle diameter is a projected figure calculated by a TEM (transmission electron microscope) with a confidence interval of 99%, based on a sample containing 100 particles.
^bThe aggregate diameter is based on an analysis by the EEPS 3090. The sampling tube was directly plugged into the 20-l-apparatus. The test was performed in accordance with the standard 20-l-apparatus test procedure. The aluminum powders came from dust container by high pressure air (20 barg) to the steel sphere (−06 barg).