Analysis on Mixing Process of Power-law Fluid and Particles in Kenics Static Mixer
The cause of island without particle in the power-law fluid was investigated in Kenics static mixers.The mixing process of solid particles and CMC solution with three concentrations in Kenics static mixer was numerically simulated by Fluent,and the concentration coefficient of variation(COV)was used to quantitatively analyze the particle distribution.On the middle cross-section of 4th～8th twist blades,two pairs of island without particle were formed in power-law fluid.In this study,the residence time of particle was shortened and the boundary of island was clearer when the apparent viscosity of power-law fluid reduced and the velocity of mixer inlet increased.But the lower COV value and the better mixing effect were obtained with increasing apparent viscosity and flow velocity.The vorticity absolute value was high in internal flow vortex and near-wall vortex induced by the twisted blade,and there were islands without particle in the center region of vortices.The island without particle disappeared with the vortex dissipation near the interface of adjacent blades and the outlet of twisted blades.
Kenics static mixerPower law fluidLiquid-solid mixingCoefficient of variationIsland without particle
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