Study on Numerical Simulation of Double Droplets Infiltration in 3DP Technology
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摘要: 为了提高3DP工艺的精度，需预测粘结剂与颗粒材料粘结的形态，而通过实验很难观测到液滴在粉床中的渗透过程。本文通过应用水平集方法建立了双液滴渗透过程的数学模型，运用多物理场仿真软件COMSOL对其进行了数值模拟，分析了主要工艺参数-液滴水平间距和滴落高度对液滴渗透的形态的影响。同时为验证数学模型和仿真结果的一致性，搭建了实验平台，采用高速摄影对液滴的滴落渗透过程进行图像采集，并通过电子显微镜观测最终的凝聚形态。将实验结果与仿真结果进行了对比，验证了数值模拟的准确性，为进一步的实验研究提供了理论依据。Abstract: It is difficult to observe the infiltration process of droplets in the powder bed through experiments, therefore a mathematical model is established with the horizontal set method, in order to improve the accuracy of three-dimension printing(3DP) process and to predict the bonding of binder and granular material. The numerical simulation of droplets infiltration process is carried out via COMSOL software. The forms of droplets infiltration are influenced mainly by the droplets horizontal spacing and drop height. The experiment platform is set up to verify the consistency of the mathematical model and simulation results. The high-speed camera is utilized to capture the images of droplets infiltration process and the electron microscopy is utilized to observe the final condensed forms. The experimental results are compared with the simulated, in which the accuracy is verified, and which provides a basis for further research.
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Key words:
- 3DP technology /
- numerical simulation /
- COMSOL /
- droplets infiltration
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表 1 呋喃树脂溶液参数表
参数 密度/(kg·m-3) 动力粘度/(Pa·s) 表面张力/(N·m-1) 接触角/(°) 数值 1.120×103 9.75×10-3 4.29×10-2 31.72 
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