Consider the bonding operation described in Problem 3.103, which was analyzed under steady-state conditions. In this case however, the laser will be used to heat the film for a prescribed period of time, creating the transient heating situation shown in the sketch.

The strip is initially at 25°C and the laser provides a uniform flux of 85.000 W/m 2 over a time interval of ∆ton = 10s. The system dimensions and thermo physical properties remain the same, but the convection coefficient to the ambient air at 25°C is now 100 W/m2 ∙ K and w1 = 44 mm. Using an implicit finite-difference method with ∆x = 4 mm and ∆t = 1s, obtain temperature histories for 0

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Laser source, 4 Alon Plastic film- 111111 Metal strip T h