Atheoryofnonfluidizedgas-solidsflow,whichcombinesthetheoryofmultiphaseflowwiththemechanicsofparticulatemedia,wasproposedonthebasisofunderstandingthattheparticlescontacteachother,solidsandgasareinmovement,andthedragforceontheparticlescausedbyinterstitialgasflowissimilartogravityforcehavingthepropertyofmassforce.Thenthistheorywasverifiedbyexperimentsonverticalandinclinedmovingbeds,andwasappliedtocalculationanddesignofequipmentanddeviceswithmovingbeds,suchaspneumaticmovingbedtransport,dipleg,V-value,L-valve,orificeflow,andarchingprevention.Itcanbeusedtoguidethedesignandoperationofmovingbedsandfixedbeds.
