Experimental apparatus
A schematic diagram of the experimental apparatus is shown in Fig. 1. The experimental apparatus of the air dense medium
fluidized bed system consists of three main parts: Air-supply system, fluidized bed and dust collection device. The pressure of
compressed air is controlled spanning a range from 100 to 275 KPa by a valve that regulates the pressure of the tank. Ambient air
after filtering is dispersed by a distributor and arrives in the vessel and then fluidizes the magnetite medium. The magnetite
powder is fluidized in a vertical cylinder with an inner diameter of 110 mm and a height of 400 mm which is made of transparent
Plexiglas. The pressure falls between two arbitrary points of the fluidized bed is monitored by the U-shaped piezometric pipes
attached to the sidewall. The super fine dust particles generated during fluidization are collected using a filter box device.
OLYMPUS i-SPEED 3 high-speed camera system is used to study the bubble behaviour and particle motions.