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Entropy Production due to Time Exponentially Varying Laser Pulse: Convective Boundary Condition Case

Laser pulse heating with convective boundary at the surface finds applications in laser gas-assisted processing. Thermodynamic irreversibility associated with the thermal system can be quantified through entropy production. Consequently, in the present study, analytical formulation of entropy production is carried out for exponentially varying time laser pulse heating with convective boundary condition at the surface. Entropy ratio (ratio of entropy produced to its counterpart corresponding to the no-convection-boundary situation at the surface) is introduced. It is found that entropy production is low in the early heating period. The influence of heat transfer coefficient on entropy production is significant in the surface region, which becomes more pronounced as the heating period progresses.