Formation of liquid and solid bridges under the interactions between droplet-polyethylene particle pairs

Abstract

The formation mechanism of liquid and solid bridges between particles and their effects in a gas–solid fluidized bed with liquid injection on particle aggregation is essential for the operational controls and improve operations. We used high-speed imaging, infrared thermography, and scanning electron microscope (SEM) to study the liquid film behaviors during the collision between droplets and double polyethylene particles and the formation of solid bridges. Three modes of solid bridge formation were found: the liquid film stimulated slow growth, the liquid bridge stimulated intermittent growth, and the liquid bridge stimulated rapid growth. The different growth positions and growth rate of the solid bridge of the three forms show that the influence of particle wetting degree is stronger than the liquid holding capacity on the solid bridge growth characteristic.