气溶胶直写过程数值模拟研究

Numerical Simulation of Aerosol Jet Writing Process

摘要: 作为新兴的增材制造技术，气溶胶直写技术在柔性电子、半导体封装等领域得到应用。但其过喷、卫星液滴等问题仍未完全解决，在气溶胶直写过程中，往往会使用尺寸较小的喷头，喷射过程中的流场、速度与压强等物理量难以直接观测或者测量。本研究对气溶胶直写系统进行三维几何模型并划分网格，建立了气溶胶喷射的离散相模型。通过数值模拟分析得到了气溶胶颗粒的运动轨迹以及气溶胶射流的压强与速度分布，在此基础上，分析了载气及鞘气对气溶胶聚焦作用的影响。研究揭示了气溶胶射流的运动规律和相互作用机制，为喷头结构优化和工艺参数调整提供了依据。

Abstract: As an emerging additive manufacturing technology, aerosol jet writing technology has been applied in fields such as flexible electronics and semiconductor packaging. However, issues such as overspray and satellite droplets have not been fully resolved. In the aerosol direct writing process, small-sized nozzles are often used, making it difficult to directly observe or measure physical quantities such as flow field, velocity, and pressure during the spraying process. This study conducted a three-dimensional geometric model of the aerosol jet writing system and divided it into grids, and established a discrete phase model of aerosol injection. The motion trajectory of aerosol particles and the pressure and velocity distribution of aerosol jets were obtained through numerical simulation analysis. Based on this, the influence of carrier gas and sheath gas on the focusing effect of aerosols was analyzed. The study revealed the motion laws and interaction mechanisms of aerosol jets, providing a basis for optimizing nozzle structures and adjusting process parameters.