Numerical Simulation of Aluminite Dust Dispersion for Different Particle Sizes in 20 L Vessel

20 L spherical explosion tank is one of the standard devices used to test the dust explosion characteristics parameters.The motion law of dust particle in closed space is useful for the study of the best ignition delay time in dust explosion.The dust flow process in 20 L spherical tank was investigated by numerical simulation based on computational fluid mechanics theory.The dispersion condition of aluminite particle of different sizes was monitored, and the particle subsidence times of different sizes were compared.It is shown that the particle subsidence time decreases as the particle size increases.When the particle size is bigger than a certain degree, the dust will not disperse in the closed space.