The fusion process of successive droplets impinging onto a substrate surface
The fusion process of successive droplets impinging onto a substrate surface
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DOI：
10.1007/s00339-015-9146-8
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发表时间：
2015-07-01
影响因子：
2.7
通讯作者：
Lu, BingHeng
中科院分区：
文献类型：
--
作者：
Li, SuLi;Wei, ZhengYing;Lu, BingHeng
连续沉积均匀金属液滴是一种新型的3D打印和快速成型技术。本文系统地研究了连续液滴撞击基材表面时的瞬态输运现象。对熔合过程的物理机制，包括体积液体、液固界面的毛细效应、传热和凝固进行了识别和数值量化。建立了基于流体体积法的三维模型，研究了金属熔滴在水平铝基板表面的连续沉积过程。通过实验验证了数值模型的正确性。数值模拟结果与实验结果吻合较好。研究了两个连续熔滴之间的相对距离对冲击区末端形状的影响。对金属微滴沉积制造过程进行有效的工艺控制具有重要意义。
Successive deposition of uniform metal droplet is a new kind of 3D printing and rapid prototyping technology. This paper presents a systematic numerical investigation of the transient transport phenomenon during the fusion of successive droplets impinging onto a substrate surface. The physical mechanisms of the fusion process, including the bulk liquid, capillarity effects at the liquid-solid interface, heat transfer, and solidification, are identified and quantified numerically. The 3D models based on a volume of fluid method were developed to investigate the successive deposition of molten metal droplets on a horizontally aluminum substrate surface. The numerical models are validated with experiments. The comparison between numerical simulations and experimental findings shows a good agreement. The effects of relative distances between two successive molten droplets on the end-shapes of impact regime are examined. This investigation is essential to implement effective process control in metal micro-droplet deposition manufacture.