Simulation Of Phase Morphological Evolution Of Binary Blends By Lattice Boltzmann Method

Lattice Boltzmann method(LBM) is used to study phase morphological evolution of binary blends.The results are as follows:1.The free energy model of LBM is introduced for the simulation of the phase separation of binary blends.The results indicate that the concentration differences, viscosity and shear rates determined the morphology of phase domains.The evolution of free energy in the phase separation is given.The morphology of blend systems usually results from the joint effects of the deformation,breakup and coalescence of droplet phase.2.The morphology evolution of dispersed droplets is investigated.The breakup and coalescence of droplets are studied in detail.In the case of system under shear flow,the results show that the droplets coalescence affect the variation characteristics of rate-of-strain tensor and vortex tensor.3.In order to discuss the interfacial properties more effectively,the diffuse interface model(DIM) is introduced into the free energy LBM.The effect of interface thickness on the coalescence of droplets is explained via simulation and theoretical discussion.As a result of the reverse trend of the changing of the stress and interface energy,it indicates that the concentration of the diffuse interface concems the degree of the morphology evolution.In conclusion,the LBM is applied for the research on the morphology evolution of binary blends.The present research work is a beneficial for expanding the applications of LBM in binary fluids and the issue on the stress and the interface energy of them.