LASER SHORT PULSE HEATING WITH CONVECTIVE BOUNDARY CONDITION

Abstract

Laser short pulse heat can be applied widely in industry. The modelling of laser heat is fruitful when exploring the physical process involved during interaction between laser and workpiece. In this study, a modelling of laser short pulse heating is considered with convection boundary conditions. Electron kinetic theory and the Fourier heating model are taken into account when modelling the heating process. The governing equations are nondimensionalized and the numerical method employing a finite difference scheme is introduced for solving the governing equations. The range of Biot number ( Bi ) values is considered to account for the convection loss from the surface during the heating process. The predictions of electron kinetic theory and the Fourier heating model are compared with the two-equation model predictions. It is found that the effect of the Bi is significant on the temperature rise in the surface vicinity. The electron kinetic theory predictions at high Bi approach the Fourier heating model findings as the heating progresses.