Analytical solution for pulsed laser heating process: convective boundary condition


Yilbas B., Kalyon M.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, cilt.45, ss.1571-1582, 2002 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 45 Konu: 7
  • Basım Tarihi: 2002
  • Doi Numarası: 10.1016/s0017-9310(01)00239-3
  • Dergi Adı: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
  • Sayfa Sayıları: ss.1571-1582

Özet

Laser pulse heating offers considerable advantages over the conventional heating methods in industry. In laser industrial applications, in general, an assisting gas is used, which results in convective cooling of the surface during the heating process. Moreover, modelling of the heating process reduces the experimental cost and enhances the understanding of the physical processes involved. In the present study. laser pulse heating of metallic substrates with convective boundary condition at the surface is considered. The time exponentially varying laser pulse is employed in the analysis. A closed form solution pertinent to laser time exponentially varying pulse is obtained using a Laplace transformation method. It is found that analytical solution becomes identical to that obtained previously for a step input pulse intensity when the pulse parameters (beta and gamma) are set to zero. The effect of Biot number (Bi) on the temperature profiles becomes significant as Bi greater than or equal to 0.202. Moreover, pulse parameter (beta/gamma) has considerable influence on the temperature profiles, in which case, temperature attains low values as beta/gamma becomes high. (C) 2002 Published by Elsevier Science Ltd.