Simulation on Heat Transfer and Solidification Behavior of Micron-sized Cu Spherical Particles Prepared by Pulsated Orifice Ejection Method
The preparation of micron-sized spherical particles by the pulsed orifice ejection method(POEM)is a typical unconstrained heat transfer and solidification process,and the prepared spherical particles have the characteristics of uniform particle size,high roundness and consistent thermal history.The heat transfer mechanism dominated by convection and radiation is crucial for the preparation technology,solidification process and microstructure control.According to the preparation process,heat transfer and solidification characteristics of micron-sized spherical metal particles by POEM,a numerical calculation model of heat transfer and solidification in a three-dimensional spherical coordinate system was established.The proposed model considers the behavior of the convection and radiation heat transfer of pure Cu particles in the unconstrained solidification process,and adopts the temperature recovery method to deal with the latent heat of pure metal solidification.The temperature variation and distribution of spherical particles at different solidification stages were calculated,and the temperature gradient,cooling rate,liquid-solid interface movement and solidification rate during the solidification process were also investigated.In addition,the convective and radiative heat transfer and their contribution were simulated and analyzed,and the effects of different preparation processes on the convective heat transfer of the particles were explored.The results provide references for the optimization of the preparation and the regulation of the solidification process of micron-sized spherical particles by POEM.
spherical metal particlespulsed orifice ejection methodheat transfer and solidificationconvective and radiative heat transfernumerical simulation