Abstract No.:
4874

 Scheduled at:
Wednesday, May 11, 2016, Room 3G 12:20 PM
Modeling & Simulation I


 Title:
Modeling of the droplet detachment from a molten wire in arc plasma spraying

 Authors:
Yanguang Shan* / University of Shanghai for science & Technology , China
Weiqiu Liu / University of Shanghai for Science and Technology, China
Zhang Yuan/ University of Shanghai for Science and Technology, China

 Abstract:
The formation and detachment of droplets from the molten wire is a complex process which includes the heating and melting of the metal wire, the formation of the liquid film at the wire tip, the entrainment of the molten material by the flow, and the detaching from the wire tip. Traditionally, Lorentz force acting on the droplet is neglected, and the droplet is assumed to be spherical in shape when calculating the drag force. In this paper, a dynamic mathematical model is developed to describe the droplet formation and detaching processes from a molten wire tip in arc plasma spraying. Main forces acting on the molten wire tip, such as the gravity, the drag force, the surface tension force and the Lorentz force, are considered. The model is solved using volume of fluid method. The sizes of the resulting droplets, the time of detachment, and temperature of the droplets are investigated. It is shown that the current density, the initial velocity, the viscosity, and the surface tension of the material have significant influence on the maximum diameter and the detachment time of the resulting droplets. The detachment time of the droplet decreases with the increase of the initial speed, and decreases with the increase of the viscosity. It is found that the Lorentz force under the influence of current density will obviously cut down the detachment time and reduce the size of resulting droplet.

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