Three-Dimensional Computational Modeling of Momentum, Heat, and Mass Transfer in a Laser Surface Alloying Process

Sarkar, Sarmistha; Raj, P. Mohan; Chakraborty, Suman; Dutta, Pradip

doi:10.1080/10407780290059576

Cited by 62 publications

(22 citation statements)

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“…This indicates that the thermal transport in molten metal pools is likely to be predominantly diffusion driven. However, contrary to this conjecture, a number of research investigations [1][2][3][4][5][6][7][8][9][10] have demonstrated that the surface tension driven convection process plays a key role in determining the molten pool morphology. In this context, it is important to mention that most of the earlier numerical studies had presumed a laminar fluid flow in the molten pool.…”

mentioning

confidence: 92%

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Thermal Transport Regimes and Generalized Regime Diagram for High Energy Surface Melting Processes

Chakraborty

2007

Metall Mater Trans B

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mentioning

confidence: 92%

“…Only a small part of the input power becomes available for the purpose of melting the material and generating a molten metal pool. The power input to the molten pool is related to the source power by the following relation: [4,5,6] q ¼ gQ ½1…”

mentioning

confidence: 99%

Thermal Transport Regimes and Generalized Regime Diagram for High Energy Surface Melting Processes

Chakraborty

2007

Metall Mater Trans B

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“…Heat, fluid flow and mass transfer in laser-assisted surface modification have been studied within a numerical approach by several researchers in the past [4][5][6][7][8][9][10][11][12][13][14]. Some of the above models used a two-dimensional and quasistatic approach, to obtain information about the behavior of the laser-melted pools processed with various experimental parameters.…”

Section: Introductionmentioning

confidence: 99%

Modelling of laser surface alloying and dispersing of ceramics

Rohde

Dimitrova

2008

Laser & Photonics Reviews

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Laser-supported processes can be used to modify the electrical and thermal properties of ceramic substrates locally. These processes are characterized by a strong thermal interaction between the laser beam and the ceramic surface that leads to localized melting. During the dynamic melting process an additive material is injected into the melt pool in order to modify the physical properties. The heat and mass transfer during this dynamic melting and solidification process has been studied numerically in order to identify the dominating process parameters. Simulation tools based on a finite-volume method have been developed to describe the heat transfer, fluid flow and the phase change during the melting and solidification of the ceramic. The results of the calculation have been validated against experimental results.Cross-section through the computational domain showing the flow lines within the melting pool and the distribution of the laser dispersed particles.

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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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Three-Dimensional Computational Modeling of Momentum, Heat, and Mass Transfer in a Laser Surface Alloying Process

Cited by 62 publications

References 10 publications

Thermal Transport Regimes and Generalized Regime Diagram for High Energy Surface Melting Processes

Thermal Transport Regimes and Generalized Regime Diagram for High Energy Surface Melting Processes

Modelling of laser surface alloying and dispersing of ceramics

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

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