Simulation Of Nanofluids Flow Heat Transform Of Interpolate And Boiling Bubble Coalescence With LBM

In the past three decades,the theory of nanofluids has developed rapidly.As a new generation of high-efficiency heat exchange medium,it provides a new method for improving heat transfer coefficient.In the past two decades,the research on nanofluids has witnessed an explosive growth trend.The research fields of nanofluids include its stability analysis,physical property analysis and other characteristic measurements,as well as forced or natural convection heat transfer,boiling heat transfer,mass transfer and industrial applications and the development of some theoretical analysis or models.Computational fluid dynamics?CFD?is very important in the field of flow heat transfer.The LBM method has developed rapidly over the past two decades,especially in the field of multiphase flow,which has many advantages over traditional CFD methods.First,the LBM method is derived from Boltzmann's molecular dynamics equation,which is more basic than the general continuity equation.It is easier to describe the different terms and interactions between particles in dealing with microscopic problems.The fluid state at the macro level meets the needs of the simulation.Secondly,the LBM can replace the traditional CFD method for the discrete and numerical solution of N-S on a macro scale.Because of its parallel computing advantages,the LBM method has higher computational efficiency,and the boundary conditions are simpler and easier to implement.The model is not complicated,so the logic is easier to understand and the programming calculation is easier.The characteristics of nanofluids are be introduced in this paper,the effects of various external forces on the flow of nanoparticles,and the effects of the forces on the properties of nanoparticles.The forced convection heat transfer performance and boiling bubble motion of Al2O3-water nanofluids were simulated by LBM method.The specific method is to use the single-phase two-component LBM model to simulate the flow and heat transfer of Al2O3-water nanofluids in horizontal two-dimensional plate channels.The flow and temperature distribution characteristics of the nanofluids are obtained.The volume fraction of the fluid,the influence of the particle size of the nanoparticle on its average Nu,and the comparison with the pure fluid example of deionized water,the influence of the volume fraction of the nanofluid on the enhanced heat transfer was analyzed.Finally,using Inamuro multi-phase multi-component model,the three-dimensional model was used to simulate and compare the aggregation phenomenon of ionized water and Al₂O₃-water nanofluid boiling bubbles.The mobility and nanoparticle size were studied for nanofluid boiling bubble coalescence.