Affiliation:
1. Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge MA 02139
Abstract
In droplet-based manufacturing processes, such as dropwise rapid prototyping, solder bumping, and spray forming, the quality of the deposit is adversely affected by bouncing of liquid droplets off the target surfaces. This study investigates the effects of wetting and surface roughness on the bouncing phenomenon. An analytical model, based on the conservation of energy during deposition, was developed to correlate wetting and surface roughness to a dimensionless droplet bouncing potential. In addition, experiments were conducted to image the deposition behavior of Sn-37 wt % Pb solder droplets, averaging 280 μm in diameter, on prepared substrates with a wide range of wetting properties and roughness levels. The high-speed image data correlate well with the model prediction that droplets are likely to bounce as a target surface becomes less wetting or is roughened.
Subject
Industrial and Manufacturing Engineering,Computer Science Applications,Mechanical Engineering,Control and Systems Engineering
Reference24 articles.
1. Development of a Droplet-Based Manufacturing Process for Free-Form Fabrication;Chen;CIRP Ann.
2. Recent Advances in Highly Controlled Molten Metal Droplet Formation From Capillary Stream Break-Up With Applications to Advanced Manufacturing;Orme
3. Passow, C. H.
, 1992, “A Study of Spray Forming Using Uniform Droplet Sprays, S.M thesis, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA.
4. Molten Droplet Deposition and Solidification at Low Weber Numbers;Schiaffino;Phys. Fluids
5. Impact, Recoil and Splashing of Molten Metal Droplets;Aziz;Int. J. Heat Mass Transfer
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