Flow patterns of pulverized coal pneumatic conveying and time-series analysis of pressure fluctuations

There are multiple air gaps appearing in plug flow. The particles are full of pipe with higher solid concentration in fluidized flow without gas gaps. There is a settled layer between solid slugs with higher solid concentrations for slug flow. The flow pattern is characterizes by dilute-phase flow at the top of pipe and dense-phase flow in the bottom for stratified flow.330