Reply To: transient thermal result for laser annealing (solid>>liquid>>solid)

[Chandra Sekaran]

1: For the upper heat convection region, does it need to have directionality?

For Mechanical there is no need to specify direction. The heat flow direction is normal to the surface.

2. 2:During the annealing process, the metal undergoes a phase change from solid to liquid due to heating (with a brief two-phase transition in between), and after the laser stops, it cools down slowly (following Newton’s cooling law). The metal transitions back from liquid to solid as it cools.

Phase change can be modeled by specifying enthalpy vs temperature as a material property. This can account for the latent heat. Please refer to section 3.8 of the thermal analysis guide at https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v242/en/ans_the/Hlp_G_THE3_9.html