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Laser Surface Processing and Model Studies - download pdf or read online

By Bekir Sami Yilbas, Shahzada Zaman Shuja

ISBN-10: 3642366287

ISBN-13: 9783642366284

ISBN-10: 3642366295

ISBN-13: 9783642366291

This booklet introduces version experiences linked to laser floor processing akin to conduction constrained heating, floor re-melting, Marangoni movement and its results at the temperature box, re-melting of multi-layered surfaces, laser surprise processing, and functional purposes. The publication presents perception into the actual techniques concerned with laser floor heating and part swap in laser irradiated zone. it truly is written for engineers and researchers engaged on laser floor engineering.

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4 Bi = 2x10-4 TEMPERATURE Fig. 6 TEMPERATURE DIFFERENCE Fig. 11 Dimensionless surface temperature difference with b0 =c0 and Bi ¼ 2 Â 10À4 Bi = 2x10 -4 First peak Temp. diff. 3 Second peak Temp. diff. First Temp. diff. Second Temp. diff. 6 TEMPERATURE DIFFERENCE Fig. 12 Dimensionless surface temperature difference with b0 =c0 and Bi ¼ 2 Â 10À2 Bi = 2x10 -2 First peak Temp. diff. 3 Second peak Temp. diff. First Temp. diff. Second Temp. diff. 6 Bi = 2x10 -1 TEMPERATURE DIFFERENCE Fig. 13 Dimensionless surface temperature difference with b0 =c0 and Bi ¼ 2 Â 10À1 2 Conduction Heating of Solid Surfaces First peak Temp.

15 Temporal variation of surface temperature difference (DT) at the symmetry axis for the first ten pulses and different duty cycles cycles and as the pulse progresses towards its ending, the rate of rise becomes steady. The high rate of temperature rise is associated with the internal energy gain and temperature gradient in the surface region of the substrate material. In this case, energy absorbed by the substrate material is high in the surface region due to Lambert’s Law, which in turn, increases the internal energy gain substantially in this region.

Based on the enthalpy balance, the liquid fraction is computed. The mushy zone is a region in which the liquid fraction lies between 0 and 1. The mushy zone is modeled as a ‘‘pseudo’’ porous medium in which the porosity decreases from 1 to 0 as the material solidifies. When the material has fully solidified in a cell, the porosity becomes zero and hence the velocities also drop to zero. The enthalpy of the material is computed as the sum of the sensible enthalpy, h, and the latent heat, DH: H ¼ h þ DH ð3:13Þ where h ¼ href þ ZT Cp dT ð3:14Þ Tref and href is the reference enthalpy, Tref is the reference temperature, and Cp is the specific heat capacity.

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Laser Surface Processing and Model Studies by Bekir Sami Yilbas, Shahzada Zaman Shuja


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