Journal ArticleDOI
Liquid ejection and possible nucleate boiling mechanisms in relation to the laser drilling process
Bekir Sami Yilbas,M. Sami +1 more
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In this paper, the authors examined the liquid ejection mechanism experimentally and possible saturated nucleate boiling is treated theoretically, while a kinetic theory is adopted for the heat transfer model to obtain the surface and internal temperature rise due to the laser heating pulse.Abstract:
The laser drilling process is a complex phenomenon. This is especially true after the evaporation process starts. It is experimentally evident that liquid ejection occurs due to drag forces developed around the solid cavity and/or explosion resulting from nucleation of vapour bubbles in the liquid zone. Therefore, study into the ejection of liquid due to vapour bubble formation is necessary. Consequently, the present study examines the liquid ejection mechanism experimentally and possible saturated nucleate boiling is treated theoretically. In the experimental study, streak photography is introduced while a kinetic theory is adopted for the heat transfer model. This enables us to obtain the surface and internal temperature rise due to the laser heating pulse. It is found that the time measured for the liquid expulsion from the heated zone is identical with the time computed corresponding to possible saturated nucleate boiling.read more
Citations
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Modeling of laser keyhole welding: Part I. mathematical modeling, numerical methodology, role of recoil pressure, multiple reflections, and free surface evolution
TL;DR: In this article, a three-dimensional laser-keyhole welding model is developed, featuring the self-consistent evolution of the liquid/vapor (L/V) interface together with full simulation of fluid flow and heat transfer.
Journal ArticleDOI
Modelling of high-density laser-material interaction using fast level set method
TL;DR: In this article, a high energy-density laser beam-material interaction process has been simulated considering a self-evolving liquid-vapour interface profile, and a mathematical scheme called the level-set technique has been adopted to capture the transient liquid-veto interface.
Journal ArticleDOI
Melt ejection during laser drilling of metals
TL;DR: In this article, the authors used high speed photography and a particle stream interruption technique to determine the ejection velocity and the particle size distribution, angle of trajectory, molten layer thickness and temporal variation of melt ejection were determined.
Journal ArticleDOI
Modeling and simulation on long pulse laser drilling processing
TL;DR: In this article, a modified level-set method was used to simulate the laser drilling process on aluminum slab with millisecond pulsed laser and a 2D model was developed to trace the liquid-gas interface as well as consider mass loss during evaporation and boiling.
Journal ArticleDOI
The effects of process parameters on spatter deposition in laser percussion drilling
D.K.Y. Low,Lin Li,P.J Byrd +2 more
TL;DR: In this article, a characterisation and analysis of spatter deposition during laser drilling in Nimonic 263 alloy for various laser processing parameters using a fiber-optic delivered 400 W Nd:YAG laser is presented.
References
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Book
Introduction to solid state physics
TL;DR: In this paper, the Hartree-Fock Approximation of many-body techniques and the Electron Gas Polarons and Electron-phonon Interaction are discussed.
Journal ArticleDOI
Hydrodynamic Behavior of Solid Deuterium under Laser Heating
C. Fauquignon,F. Floux +1 more
TL;DR: In this article, a theoretical interpretation is suggested in order to explain the inward propagation of luminous fronts when a powerful laser beam is focused on solid deuterium ice, based on the propagation of a shock wave followed by a laser flux driven deflagration.
Journal ArticleDOI
Heating of metals at a free surface by laser irradiation―an electron kinetic theory approach
TL;DR: In this article, a new model for the conduction mechanism was proposed and applied to the problem of heat conduction due to laser irradiation at high power intensities (i.e. 1010 w/m2) at the upper end of temperature rise time.
Journal ArticleDOI
Effects of plasma on CO2 laser cutting quality
B.S. Yilbaş,Z. Yilbaş +1 more
TL;DR: In this article, the authors examined the effect of the plasma on the cutting performance and quality, O 2 and gas mixture pressures were varied and the absorption of the He-Ne beam passing through the plasma in the direction normal to the CO 2 beam axis measured.