Thermohydrodynamic Models of Laser Irradiation of Metals
Thermohydrodynamic models of laser irradiation of metals examines models of continuous- and recurrent-pulse irradiation under conditions of dimensional and thermochemical treatment. Hydrodynamic mechanisms of melt displacement under conditions of dimensional and thermochemical treatment. Hydrodynamic mechanisms of melt displacement under conditions of laser drilling are discussed and the space-time structure of temperature in metal under the effect of a moving recurrent-pulse heat source is studied analytically and numerically. A thermo-hydrodynamic model of the welding process is analyzed and the two-dimensional problem of the heating of metal and melt motion under vapour pressure and surface tension is modelled numerically. Convective stirring of an admixture under the effect of pulsed laser radiation is considered and numerically investigated.
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absorption coefficient aluminum Arutyunian average power beam travel rate boiling temperature bulk mode channel walls characteristic cm/s CO2 laser continuous radiation corresponding cylindrical deep penetration deep penetration threshold density dependence depth of penetration diameter dimensional drilling effect efficiency estimate Figure function gas dynamics Gaussian beam heat equation hydrodynamic irradiation Laplace transform laser beam laser pulses laser radiation laser treatment laser welding layer liquid Mach number material melt motion melt removal melt splashing melt surface metal vapors nonuniformities obtained optical breakdown optical discharge optimum parameters of recurrent-pulse penetration by recurrent-pulse penetration depth penetration of metals perturbation preassigned problem processes propagation pulse duration pulse energy pulse repetition frequency radiation flux radiation pulse radius recurrent-pulse laser recurrent-pulse mode recurrent-pulse radiation sample saturated vapor pressure Section self-radiation solution stimulation surface temperature surface tension theoretical thermal conductivity thermohydrodynamic model vacuum vapor flow vapor pressure velocity wave waveguide zone