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首页> 外文期刊>Journal of heat transfer: Transactions of the ASME >Model and powder particle heating, melting, resolidification, and evaporation in plasma spraying processes
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Model and powder particle heating, melting, resolidification, and evaporation in plasma spraying processes

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A comprehensive model is developed to study the heating, melting, evaporation, and resolidification of powder particles in plasma flames. The well-established LAVA code for plasma flame simulation is used to predict the plasma gas field undergiven power conditions, and provide inputs to the particle model. The particle is assumed to be a spherical and one-dimensional heat conduction equation with phase change within the particle is solved numerically using an appropriate coordinatetransformation and finite difference method. Melting, vaporization, and resolidification interfaces are tracked and the particle vaporization is accounted for by the mass diffusion of vapor through the boundary layer around the particle. The effect ofmass transfer on convective heat transfer is also included. Calculations have been carried out for a single particle injected into an Ar-H{sub}2 plasma jet. Zirconia and nickel are selected as solid particles because of their widespread industrialapplications as well as significant differences in their thermal properties. Numerical results show strong nonisothermal effect of heating, especially for materials with low thermal conductivity, such as zirconia. The model also predicts strongevaporation of the material at high temperatures.

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