Lattice Boltzmann method for dynamic wetting problems

Attar, Elham; Körner, Carolin

doi:10.1016/j.jcis.2009.02.055

Cited by 61 publications

(29 citation statements)

References 29 publications

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“…We use numerical simulation in order to understand the correlation between scanning strategy, resulting solidification conditions and microstructure. The numerical model (based on the Lattice Boltzmann Method) which we have developed for simulation of powder bed based additive manufacturing processes has been described in several publications [8][9][10][11][12][13][14][15]. The beam melting process is simulated on the powder scale, i.e.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Tailoring the grain structure of IN718 during selective electron beam melting

Körner

Helmer

Bauereiß

et al. 2014

MATEC Web of Conferences

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118

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Abstract. Selective electron beam melting (SEBM) is an additive manufacturing method where complex parts are built from metal powders in layers of about 50 µm. SEBM works under vacuum conditions which results in a perfect protection of the metal alloy. The electron beam is used for heating (about 900 • C building temperature) and selective melting. The high beam velocities allow innovative scanning strategies in order to adapt the local solidification conditions which determine the epitaxial solidification process of IN718. We show how scanning strategies can be used either to produce a columnar grain structure with a high texture in building direction or a complete texture-free fine grained structure. Numerical simulations of the selective melting process are applied to reveal the fundamental mechanisms responsible for the completely different grain structures. In addition the influence of the different grain structures on the mechanical properties of IN718 is briefly discussed.

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Section: Numerical Simulationsmentioning

confidence: 99%

Tailoring the grain structure of IN718 during selective electron beam melting

Körner

Helmer

Bauereiß

et al. 2014

MATEC Web of Conferences

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118

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“…The basic idea of our approach is to bring this force into the numerical model as a kind of additional capillary force. Details of the algorithm and its validation are given in Attar and Körner (2009). The wetting angle between fluid and solid powder can be adjusted between 0 and .…”

Section: Free Boundary Treatmentmentioning

confidence: 99%

Mesoscopic simulation of selective beam melting processes

Körner

Attar

Heinl

2011

Journal of Materials Processing Technology

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385

183

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“…Many experimental studies had revealed that free surface evaporation greatly affected the contact line motion and the dynamic contact angle [4][5][6][7][8][9]. The spreading of nonevaporating droplets has been widely studied theoretically using macroscopic hydrodynamic models [10][11][12] and numerically using the mesoscopic lattice Boltzmann method (LBM) [13][14][15] and microscopic MD simulations [16][17][18][19][20]. There were some studies of droplet spreading-evaporating using macroscopic computational fluid dynamics (CFD) models [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Effects of Free Surface Evaporation on Water Nanodroplet Wetting Kinetics: A Molecular Dynamics Study

Duan

Wang

2015

Journal of Heat Transfer

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The wetting kinetics of a water nanodroplet undergoing evaporation on a heated gold substrate were examined using molecular dynamics (MD) simulations. Various substrate and initial droplet temperatures were used to obtain different evaporation rates. The water molecule absorption-desorption behavior was analyzed in the vicinity of the contact line region to show the microscopic details of the spreading-evaporating droplet. Increasing substrate temperatures greatly affected the dynamic wetting process, while the initial water droplet temperature had very little effect. The effects of droplet size and substrate wettability on the droplet spreading-evaporating process were also examined. The radius versus time curves agree well with molecular kinetics theory (MKT) for spreading without evaporation but differ from MKT when the spreading induced evaporation. The enhancement of the wetting kinetics by the evaporation can be attributed to the reduction of the liquid-vapor surface tension and the increased water molecule motion in the contact line region and in the bulk droplet.

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Lattice Boltzmann method for dynamic wetting problems

Cited by 61 publications

References 29 publications

Tailoring the grain structure of IN718 during selective electron beam melting

Tailoring the grain structure of IN718 during selective electron beam melting

Mesoscopic simulation of selective beam melting processes

Effects of Free Surface Evaporation on Water Nanodroplet Wetting Kinetics: A Molecular Dynamics Study

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