A two-dimensional transient model for convection in laser melted pool

Chan, Cho Lik; Mazumder, J.; Chen, M. M.

doi:10.1007/bf02647100

Cited by 304 publications

(104 citation statements)

References 4 publications

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“…Chan et al [1] reported that the recirculating velocity, as predicted by their model, was of one or two orders of magnitude higher than the scanning speed. That means fluid particle would recirculate several times before it was solidified.…”

Section: Introductionmentioning

confidence: 93%

“…The role of heat-transfer phenomena in welding and surface treatment is crucial for obtaining high quality surfaces by eliminating defects, such as undercutting, non-uniform surface profile, and cavities, which are attributed to changes in fluid flow and heat transfer [1].…”

Section: Introductionmentioning

confidence: 99%

“…In an arc weld pool, flow driven by both surface tension and electromagnetic fields play an important role. However, in laser welding, only surface tensiondriven flow is significant [1]. These models were used to calculate weld pool geometry by calculating temperature fields during the welding of stainless steel [4], aluminum alloys [5], titanium alloys [6], and pure iron [7].…”

Section: Introductionmentioning

confidence: 99%

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Applied multi-pulsed laser in surface treatment and numerical–experimental analysis

Laazizi

Courant

Jacquemin

et al. 2011

Optics & Laser Technology

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Applied multi-pulsed laser in surface treatment and numerical–experimental analysis

Laazizi

Courant

Jacquemin

et al. 2011

Optics & Laser Technology

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“…They correlated the temperature distribution and the depth of the melting with the size, velocity and the power level of the beam. Chan et al [35] considered a two-dimensional transient model of laser melting. Movement of the heat source was taken into consideration by coordinate transformation.…”

Section: Laser Surface Processing Techniquesmentioning

confidence: 99%

Laser modification of the materials surface layer – a review paper

Kusiński¹,

Kąc²,

Kopia³

et al. 2012

Bulletin of the Polish Academy of Sciences: Technical Sciences

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Abstract. The state of laser processing in surface materials modification in Poland is reported, based on own experience, coworkers and coauthors results, as well the literature review. The curriculum concerning historical development of lasers and laser technology in Poland, laser-matter interaction, as well basis of different laser techniques applied in materials surface engineering (solid state hardening, melting, alloying, cladding, ablation, shot peening, cleaning and texturing) are reviewed, and compared with results of coauthors, as well with a wide range of Polish authors papers. Finally, it is concluded that overall state of research on laser application in surface engineering in Poland is well developed and still growing industrial application is observed.

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“…The mathematical modeling for such problems becomes further complicated due to the complex boundary conditions and temperature-dependent variable thermal and physical properties. Laminar flow theories were used in earlier studies to address the thermo-fluidic transport in laser melted pools (Chan et al, 1984;Kou and Wang, 1986;Sarkar et al, 2002). However, it was not quite successful in predicting the experimental behavior.…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Numerical Strategies for Modeling the Transport Phenomena in High-Energy Laser Surface Alloying Process

Chatterjee

2017

Front. Mech. Eng.

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A comparative assessment is done on the effectiveness of some developed and reported macroscopic and mesoscopic models deployed for addressing the three-dimensional thermo-fluidic transport during high-power laser surface alloying process. The macroscopic models include the most celebrated k-ε turbulence model and the large eddy simulation (LES) model, whereas a kinetic theory-based lattice Boltzmann (LB) approach is invoked under the mesoscopic paradigm. The time-dependent Navier-Stokes equations are transformed into the k-ε turbulence model by performing the Reynolds averaging technique, whereas a spatial filtering operation is used to produce the LES model. The models are suitably modified to address the turbulent melt-pool convection by using a modified eddy viscosity expression including a damping factor in the form of square root of the liquid fraction. The LB scheme utilizes three separate distribution functions to monitor the underlying hydrodynamic, thermal and compositional fields. Accordingly, the kinematic viscosity, thermal and mass diffusivities are adjusted independently. A single domain fixed-grid enthalpy-porosity approach is utilized to model the phase change phenomena in conjunction with an appropriate enthalpy updating closure scheme. The performance of these models is recorded by capturing the characteristic nature of the thermo-fluidic transport during the laser material processing. The maximum values of the pertinent parameters in the computational domain obtained from several modeling efforts are compared to assess their capabilities. The comparison shows that the prediction from the k-ε turbulence model is higher than the LES and LB models. In addition, the results from all three models are compared with the available experimental results in the form of dimensionless composition of the alloyed layer along the dimensionless depth of the pool. The comparison reveals that the LB and the LES approaches are better than the k-ε turbulence approach in reproducing the experimental results.

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A two-dimensional transient model for convection in laser melted pool

Cited by 304 publications

References 4 publications

Applied multi-pulsed laser in surface treatment and numerical–experimental analysis

Applied multi-pulsed laser in surface treatment and numerical–experimental analysis

Laser modification of the materials surface layer – a review paper

A Comparison of Numerical Strategies for Modeling the Transport Phenomena in High-Energy Laser Surface Alloying Process

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