Modeling the dynamics of thermocapillary motion in a laser fusion--the utilization of the FIDAP pack

Maria Walczak; Jerzy Sek

doi:10.1117/12.287820

3 October 1997 Modeling the dynamics of thermocapillary motion in a laser fusion: the utilization of the FIDAP pack

Maria Walczak, Jerzy Sek

Proceedings Volume 3187, Laser Technology V: Applications in Materials Sciences and Engineering; (1997) https://doi.org/10.1117/12.287820
Event: Laser Technology V, 1996, Szczecin, Poland

Abstract

The paper presents the results of analysis of thermocapillary phenomena in the liquid phase of a laser fusion. Making use of the FIDAP program the authors modelled the phenomena of convection using silver as an example. Silver was subjected to the action of a laser radiation pulse of the duration (tau) equals 4 ms and the Gaussian distribution of the power density q_o approximately 10⁹ . . . 10¹¹ W/m², of the radius r_o equals 150 micrometer. The axis symmetry of the model was assumed. Thermal coefficients were assumed to be constant for each phase, while the values of the surface tension as a function of temperature. With such assumptions the Marangoni convection is the primary cause of convection motion. The velocity field and the shape of the interfacial surface were determined on the basis of calculations performed using the FIDAP program. The shape coefficient (K equals d/h - width by depth) of the fusion is in good agreement with the real value. The paper indicates some possibilities of using a model built with the help of the FIDAP program for predicting some results of laser melting.

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Maria Walczak and Jerzy Sek "Modeling the dynamics of thermocapillary motion in a laser fusion: the utilization of the FIDAP pack", Proc. SPIE 3187, Laser Technology V: Applications in Materials Sciences and Engineering, (3 October 1997); https://doi.org/10.1117/12.287820

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KEYWORDS

Convection

Silver

Laser welding

Metals

Liquids

Temperature metrology

Motion models

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