Heat transfer in granular medium for application to selective laser melting: A numerical study

Dayal, Ram; Gambaryan‐Roisman, Tatiana

doi:10.1016/j.ijthermalsci.2016.11.014

Cited by 16 publications

(9 citation statements)

References 36 publications

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“…7 shows visualization of sintering a line on the top layer of the powder bed. It shows that the general shape of the heat affected zone and heat transfer through the powder bed match with results previously reported in studies such as [6] and [4]. Also, Fig.…”

supporting

confidence: 89%

An Adaptive Discrete Element Method for Physical Modeling of the Selective Laser Sintering Process

Gobal

Ravani

2017

AMM

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Abstract. Selective Laser Sintering (SLS) has recently become one of the fastest growing additive manufacturing processes due to its capability of fabricating metal parts with high dimensional accuracy and surface quality. Physical modeling of selective laser sintering plays an important role in properly controlling the process parameters to achieve desired product properties. In this paper, we present a 3 dimensional, adaptive discrete element method for simulation of the SLS process on personal computers. The presented method models the laser-powder interaction at particle level, achieving high simulation accuracy while adaptively increasing the discrete element size as local temperatures drop inside the powder bed for improved efficiency. Numerical shape functions are developed for calculating individual particle temperatures at any point during the simulation. Results show that this physical model improves the runtime significantly in virtual simulation of SLS process without loss of simulation accuracy .

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confidence: 89%

An Adaptive Discrete Element Method for Physical Modeling of the Selective Laser Sintering Process

Gobal

Ravani

2017

AMM

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“…The dynamics of porous media dissolving in a flowing liquid were studied theoretically and experimentally in [198][199][200]. The models of melting powder particles under intense radiation (laser) were proposed in [201,202]; filtration models in media undergoing phase transitions were proposed in [203][204][205]. A model of heating and shrinkage of polymer granule packing was proposed in [206].…”

Section: Filtration In Reactive Mediamentioning

confidence: 99%

Particle Agglomeration of Biomass and Plastic Waste during Their Thermochemical Fixed-Bed Conversion

Donskoy

2023

Energies

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The article provides state-of-the-art research on agglomeration processes during fixed-bed combustion and gasification of low-grade fuels such as biomass and waste (primarily plastic-containing waste). Such fuels demonstrate complex thermal behaviour: their decomposition and combustion are multistage, accompanied by phase transitions, and may lead to fixed-bed mechanical instability and the non-uniformity of air distribution over the cross-section. To clarify the role of physicochemical factors (fuel composition and properties, reactor conditions), data from different sources are compared. The review shows that the fixed-bed agglomeration regimes can, in a rough approximation, be classified by the sintering mechanism (due to the melting of the mineral part or the organic part), with the following search for each mechanism realisation conditions by comparing the fuel properties and characteristic temperatures. Attempts to theoretically describe and numerically simulate the agglomeration phenomenon as a change in the structure of a reacting dispersed medium are also considered: the main directions in which such approaches can be developed are indicated.

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“…Increasing the distance between two particles, the results of comparing the numerical model and exact solution [40] are shown in Fig. 7(b).…”

Section: Model Validationmentioning

confidence: 99%

“…This approach was further applied to strongly non-homogeneous porous media with application to a slab of packed particles [38] and non-Beerian effective phases of macroporous media [39]. Dayal et al [40] used view factors to analyze radiative heat transfer in granular medium at particle scale. Since practical system contains a large number of particles, the computation time and memory consumption for radiative heat transfer analysis directly at the particle scale is huge.…”

Section: Introductionmentioning

confidence: 99%

Continuum approach based on radiation distribution function for radiative heat transfer in densely packed particulate system

Liu

Zhao

2020

Journal of Quantitative Spectroscopy and Radiative Transfer

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Heat transfer in granular medium for application to selective laser melting: A numerical study

Cited by 16 publications

References 36 publications

An Adaptive Discrete Element Method for Physical Modeling of the Selective Laser Sintering Process

An Adaptive Discrete Element Method for Physical Modeling of the Selective Laser Sintering Process

Particle Agglomeration of Biomass and Plastic Waste during Their Thermochemical Fixed-Bed Conversion

Continuum approach based on radiation distribution function for radiative heat transfer in densely packed particulate system

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