A Three-Dimensional Model of Droplet Impinging, Solidification and Suspension on the Substrate

Abstract:

A three-dimensional model was built to study a molten metal droplet impact on an edge of the substrate in droplet deposition manufacturing process for the first time. The whole calculation domain, including the substrate, was described using same fluid conservation equations, which is to say that the remolding and solidification of substrate was considered also. Droplet free surface was tracked by volume-of-fluid (VOF) algorithm. The effect of surface tension on the droplet was taken into consideration by means of considering surface tension to be a component of the body force. The simulated results show that the droplet in liquid phase can keep suspending on the substrate at a role of surface tension. A too high impact velocity would make parts of droplet splash away the substrate which is not allowed in manufacturing process. The offset between edge of droplet and side edge of substrate influences dramatically the impact of the droplet.

• Periodical: Advanced Materials Research (Volume 346)
• Pages: 222-227
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.346.222
• Online since: September 2011
• Authors: Sheng Zhu, Feng Liang Yin, Jian Liu, Yuan Yuan Liang
• Keywords: Deposition Manufacturing, Droplet, Numerical Simulation

References

[1] M. Pasandideh-Fard, S. Chandra, J. Mostaghimi, A three-dimensional model of droplet impact and solidification, International Journal of Heat and Mass Transfer, vol. 45, pp.2229-2242, (2002).

DOI: 10.1016/s0017-9310(01)00336-2

[2] M. Francois, W. Shyy, Computations of drop dynamics with the immersed boundary method, part2: drop impact and heat transfer, Numerical Heat Transfer Journal, Part B, vol. 44, pp.119-143, (2003).

DOI: 10.1080/713836348

[3] R. Ghafouri-Azar, S. Shakeri, S. Chandra, J. Mostaghimi, Interactions between molten metal droplets impinging on a solid surface, International Journal of Heat and Mass Transfer, vol. 46, pp.1395-1407, (2003).

DOI: 10.1016/s0017-9310(02)00403-9

[4] J. U. Brackbill, D. B. Kothe, C. Zemach, A continuum method for modeling surface tension, Journal of Computational Physics, vol. 100, pp.335-354, (1992).

DOI: 10.1016/0021-9991(92)90240-y

[5] Y. Wang, H. L. Tsai, Impingement of filler droplets and weld pool dynamics during gas metal arc welding process, International Journal of Heat and Mass Transfer, vol. 44, pp.2067-2080, (2001).

DOI: 10.1016/s0017-9310(00)00252-0