Summary: Optics and Lasers in Engineering 46 (2008) 2733
Entropy generation rate during laser pulse heating: Effect of laser
pulse parameters on entropy generation rate
H. Al-Qahtani, B.S. YilbasĂ
KFUPM, Box 1913, Dhahran 31261, Saudi Arabia
Received 3 March 2007; accepted 11 August 2007
Available online 24 September 2007
Laser pulse heating of solid surface and entropy generation during the heating process are considered. Time exponentially decaying
pulse is accommodated in the analysis and the laser pulse parameter (b1/b2) resulting in minimum entropy generation rate is computed.
Analytical solutions for temperature rise are presented and volumetric entropy generation rate is formulated. Two laser pulses resulting
in low volumetric entropy generation rate are examined in detail and volumetric entropy generation rate is associated with the laser pulse
parameter (b1/b2). It is found that volumetric entropy generation rate attains high values in the early heating period due to large (1/T 2
Moreover, the laser pulse with high-peak intensity results in lower volumetric entropy generation rate than that corresponding to the
low-intensity laser pulse with the same energy content.
r 2007 Elsevier Ltd. All rights reserved.
Keywords: Laser; Pulse; Temperature; Entropy generation rate
Laser pulse heating of solid surfaces finds application in