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Thermomechanical simulation of the splashing of ceramic droplets on a rigid substrate. (English) Zbl 0900.76291

Summary: Finite element simulation techniques have been applied to the spreading process of single ceramic liquid droplets impacting on a flat cold surface under plasma-spraying conditions. The goal of the present investigation is to predict the geometrical form of the splat as a function of technological process parameters, such as initial temperature and velocity, and to follow the thermal field developing in the droplet up to solidification. A nonlinear finite element programming system has been utilized in order to model the complex physical phenomena involved in the present impact process. The Lagrangian description of the motion of the viscous melt in the drops, as constrained by surface tension and the developing contact with the target, has been coupled to an analysis of transient thermal phenomena accounting also for the solidification of the material. The present study refers to a parameter spectrum as from experimental data of technological relevance. The significance of process parameters for the most pronounced physical phenomena is discussed as are also the consequences of modelling. We consider the issue of solidification as well and touch on the effect of partially unmelted material.

MSC:

76M10 Finite element methods applied to problems in fluid mechanics
76D99 Incompressible viscous fluids
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