Abstract
A mathematical model for accelerating powder particles by a gas
and for their thermal behavior during flight has been developed.
Usually, dealing with the solidification of metal droplets, the
interaction between an array of droplets and the surrounding gas
is not integrated into the modeling of such a process, e.g. in the
literature the gas temperature is often modeled by an empirical
expression. In the present model, however, the interaction between
the enveloping gas and an array of droplets has been coupled and
calculated numerically. The applicability of the empirical
relation of the gas temperature proposed in the literature has
been discussed in relation to the present model. One of the major
advantages of the present modeling is that it provides a tool to
predict the thermal behavior of droplets during flight without the
need of experimental parameters, i.e. gas temperature.
Furthermore, the model predicts the effect of process parameters
on the size distribution, temperature, velocity histories,
fraction-solid and cooling rate for all droplet sizes
characterizing the complete droplet size distribution.
Original language | English |
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Journal | Modelling and Simulation in Materials Science and Engineering |
Volume | 7 |
Issue number | 3 |
Pages (from-to) | 413-430 |
ISSN | 0965-0393 |
Publication status | Published - 1999 |