Abstract:

An L?shaped mixing head model with a version number of MK?8/12UL?2K was used to simulate and analyze the high?pressure and high?speed collision of two?phase material fluid in the mixing head cavity using a CFD numerical simulation software. The effects of flow rate and viscosity on the mixing effectiveness were investigated using a controllable variable method. To better characterize the motion of glass beads in the mixing process， particle tracer analysis was carried out on the whole flow field. By comparing the pressure and velocity cloud diagram， it is concluded that the increase of mass flow leads to an increase in velocity pressure in the mixing chamber. This means that the collision degree becomes higher and the collision location becomes more inclined to the outlet side of the material with a high viscosity. The increase of viscosity resulted in a decrease in the pressure lifting speed of the material in the mixing chamber. The collision position was more inclined to the outlet side of the material at a high viscosity， resulting in a significant increase in friction force. The particle residence time decreased with an increase in mass flow rate but increased with an increase in viscosity. The simulation results provide a certain reference value for the design and processing optimization of mixing heads.

Key words: enhanced reactive injection molding, L?shaped mixing head, glass microspheres, numerical simulation