Numerical modelling of thermal spray systems

The purpose of this paper is to present a brief overview of the MD* thermal spray process, review the current existing models of heat transfer and fluid mechanics relevant to this process, outline a simplified thermal model implemented together with the results, and discuss the activities required for the implementation and verification of an accurate temperature model of the MD* thermal spray process. The thermal model involves a mixed Lagrangian/explicit Eulerian algorithm to track the solidification for the time-dependent, one-dimensional heat equation. The effect of operating parameters (droplet/substrate temperatures, droplet size, etc.) on temperature distribution and remelting thickness is predicted. Furthermore, the motivation behind the desire for accurate spray temperature prediction of the ongoing Navigator project will be discussed. NUMERICAL MODELLING OF THERMAL SPRAY SYSTEMS

[1]  P. Fauchais,et al.  A model of the temperature distribution in an alumina coating during plasma spraying , 1982 .

[2]  J. Crank.  Free and moving boundary problems , 1984 .

[3]  J. Madejski,et al.  Solidification of droplets on a cold surface , 1976 .

[4]  B. Cantor,et al.  The relationship between thermal history and microstructure in spray-deposited tin-lead alloys , 1991 .

[5]  M. Moore,et al.  The solidification of pure metals (and eutectics) under uni-directional heat flow conditions: II. Solidification in the presence of superheat , 1975 .

[6]  D. A. Gerdeman,et al.  Arc Plasma Technology in Materials Science , 1972 .

[7]  Diran Apelian,et al.  Analysis of the spray deposition process , 1989 .

[8]  M. Prates,et al.  Mathematical model for the unidirectional solidification of metals: I. cooled molds , 1978 .

[9]  T. W. Clyne.  Numerical modelling of directional solidification of metallic alloys , 1982 .

[10]  T. W. Clyne,et al.  Solute redistribution during solidification with rapid solid state diffusion , 1981 .

[11]  Lee E. Weiss,et al.  Thermal spray shape deposition , 1992 .

[12]  J. Szekely,et al.  An experimental and analytical study of the solidification of a binary dendritic system , 1978 .

[13]  H. Jones,et al.  The effect of melt superheat and impact velocity on splat thickness , 1975 .

[14]  G. S. Hanumanth.  Solidification in the presence of natural convection , 1990 .

[15]  J. Szekely,et al.  Heat transfer and fluid flow in plasma spraying , 1984 .

[16]  C. Moreau,et al.  Flattening and solidification of thermally sprayed particles , 1992 .

[17]  R. Viskanta,et al.  Heat Transfer During Melting and Solidification of Metals , 1988 .

[18]  Gerardo Trapaga,et al.  Mathematical modeling of the isothermal impingement of liquid droplets in spraying processes , 1991 .

[19]  R. McPherson,et al.  The relationship between the mechanism of formation, microstructure and properties of plasma-sprayed coatings , 1981 .