On the use of the Prandtl mixing length model in the cutting torch modeling

B MANCINELLI; F O MINOTTI; H KELLY

Journal of Physics: Conference Series

IOP PUBLISHING LTD

Lugar: Londres; Año: 2011 vol. 296 p. 12025 - 12032

1742-6596

The Prandtl mixing length model has been used to take into account the turbulent effects in a 30 A high-energy density cutting torch model. In particular, the model requires the introduction of only one adjustable coefficient c corresponding to the length of action of the turbulence. It is shown that the c value has little effect on the plasma temperature profiles outside the nozzle (the differences being less than 10 %), but severely affects the plasma velocity distribution, with differences reaching about 100 % at the middle of the nozzle-anode gap. Within the experimental uncertainties it was also found that the value c = 0.08 allows to reproduce both, the experimental data of velocity and temperature.