This paper attempts to review the theories andmathematical models which have been advanced to explain thejigging process .The existing literature on mathematicalmodelling and quantitative analysis of jigging reveal that verylittle is known about the stratification of particles in a jig bed .Itis realized that a microscopic model is the one that is most suitedto study stratification in jigs .A new modelling approach based onNewtonian mechanics is used to study the stratification behaviorof particles in a batch jig .In this approach ,the motion of solidparticles is treated using the discrete element method(DEM) .Since in DEM ,the motion of the particles is computedfrom the forces acting on them ,the effect of the fluid is easilyincorporated through the buoyancy and drag forces .Forillustration purposes ,a jig bed consisting of 400 particles of twodifferent densities is simulated .Preliminary results show that themodel predicts the stratification of particles reasonably well.
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