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Relevant bibliographies by topics / Melt pool convection

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Academic literature on the topic 'Melt pool convection'

Author: Grafiati

Published: 24 June 2021

Last updated: 29 July 2025

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Journal articles on the topic "Melt pool convection"

1

Yang, Ruining, Wenjin Chen, Linfeng Tang, et al. "Research on the Melt Pool Shape Formation Mechanism of the Laser Surface Remelting of Nickel-Based Single-Crystal Superalloy." Crystals 13, no. 8 (2023): 1162. http://dx.doi.org/10.3390/cryst13081162.

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By numerical simulation and experimental analysis, the melt pool shapes for the laser surface remelting of nickel-based single-crystal superalloy under different processing parameters are investigated. The results show that heat conduction and heat convection work together to determine the formation of the melt pool during the laser surface remelting, and the melt pool shape can be controlled by adjusting the laser power and laser scanning speed. For processing with large laser power and low scanning speed, the alloy vaporizes in the melt pool, which makes the melt pool shape unstable. For las

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Jähnig, Theresa, Cornelius Demuth, and Andrés Fabián Lasagni. "Influence of Sulphur Content on Structuring Dynamics during Nanosecond Pulsed Direct Laser Interference Patterning." Nanomaterials 11, no. 4 (2021): 855. http://dx.doi.org/10.3390/nano11040855.

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The formation of melt and its spread in materials is the focus of many high temperature processes, for example, in laser welding and cutting. Surface active elements alter the surface tension gradient and therefore influence melt penetration depth and pool width. This study describes the application of direct laser interference patterning (DLIP) for structuring steel surfaces with diverse contents of the surface active element sulphur, which affects the melt convection pattern and the pool shape during the process. The laser fluence used is varied to analyse the different topographic features

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Das, Saurabh, and Satya Prakash Kar. "Role of Marangoni Convection in a Repetitive Laser Melting Process." Materials Science Forum 978 (February 2020): 34–39. http://dx.doi.org/10.4028/www.scientific.net/msf.978.34.

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To effectively interpret the fluid flow dynamics in the molten metal pool, a numerical model was established. The moving repetitive Gaussian laser pulse is irradiated in the work piece. The consideration of laser scanning speed makes the transport phenomena complex. The continuity and momentum equations are solved to get the flow velocity of the molten metal in the melt pool. The energy equation is solved to know the temperature field in the work piece. The algebraic equations obtained after discretization of the governing equations by Finite Volume Method (FVM) are then solved by the Tri Diag

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Han, Lijun, Frank W. Liou, and Srinivas Musti. "Thermal Behavior and Geometry Model of Melt Pool in Laser Material Process." Journal of Heat Transfer 127, no. 9 (2005): 1005–14. http://dx.doi.org/10.1115/1.2005275.

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Melt pool geometry and thermal behavior control are essential in obtaining consistent building performances, such as geometrical accuracy, microstructure, and residual stress. In this paper, a three dimensional model is developed to predict the thermal behavior and geometry of the melt pool in the laser material interaction process. The evolution of the melt pool and effects of the process parameters are investigated through the simulations with stationary and moving laser beam cases. The roles of the convection and surface deformation on the heat dissipation and melt pool geometry are reveale

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Aggoune, Samia, Farida Hamadi, Karim Kheloufi, et al. "The Marangoni Convection Effect on Melt Pool Formation during Selective Laser Melting Process." Defect and Diffusion Forum 412 (November 12, 2021): 107–14. http://dx.doi.org/10.4028/www.scientific.net/ddf.412.107.

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In order to predict the effect of the Marangoni convection and the morphology of melted stainless steel powder, during the selective laser melting (SLM) process, a transient three-dimensional numerical model is developed at the mesoscale. The evolution of the temperature and velocity fields’ is then studied. The initial powder bed distribution is obtained by the discrete element method (DEM) calculation, and the temperature distribution and the molten pool shape deformation are calculated and analyzed by the Ansys-Fluent commercial code. The molten pool shape is obtained by considering the inf

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Tan, M. J., D. H. Cho, and F. B. Cheung. "Thermal Analysis of Heat-Generating Pools Bounded From Below by Curved Surfaces." Journal of Heat Transfer 116, no. 1 (1994): 127–35. http://dx.doi.org/10.1115/1.2910846.

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A computer code that features the use of a directional effective thermal conductivity in modeling natural convection in heat-generating pools has been developed to analyze heat transfer in such pools, which are bounded from below by curved surfaces. Illustrative calculations pertaining to two published experimental studies on convective heat transfer in water pools with uniformly distributed volumetric energy sources are carried out using the code. The water pools used in the two studies under consideration were cooled either from the top or from the bottom, but not from both. The utility as w

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Fan, T. H., and F. B. Cheung. "Modeling of Transient Turbulent Natural Convection in a Melt Layer With Solidification." Journal of Heat Transfer 119, no. 3 (1997): 544–52. http://dx.doi.org/10.1115/1.2824137.

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The phenomenon of turbulent natural convection in a horizontal heat-generating melt layer with solidification taking place at the cooled upper and lower boundaries is investigated theoretically. The objective is to determine the transient behavior of the crust at the upper and lower surfaces and the effect of crust formation on the turbulent natural convection process in the melt layer. Various surface temperatures, latent heats, and the heat source strengths are considered along with the effects of the Stefan number and Rayleigh number. Special attention is given to the interaction between th

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Demuth, Cornelius, and Andrés Fabián Lasagni. "An Incompressible Smoothed Particle Hydrodynamics (ISPH) Model of Direct Laser Interference Patterning." Computation 8, no. 1 (2020): 9. http://dx.doi.org/10.3390/computation8010009.

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Functional surfaces characterised by periodic microstructures are sought in numerous technological applications. Direct laser interference patterning (DLIP) is a technique that allows the fabrication of microscopic periodic features on different materials, e.g., metals. The mechanisms effective during nanosecond pulsed DLIP of metal surfaces are not yet fully understood. In the present investigation, the heat transfer and fluid flow occurring in the metal substrate during the DLIP process are simulated using a smoothed particle hydrodynamics (SPH) methodology. The melt pool convection, driven

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Zou, Fan, Shuguang Yao, Yunhui Dong, et al. "Research on Multiscale Numerical Simulation Method for SLM Melting Process." Metals 14, no. 7 (2024): 825. http://dx.doi.org/10.3390/met14070825.

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In the selective-laser-melting process, it is difficult to monitor the evolution of the melt pool in real time via experimental methods due to the complexity and fine scale of laser–powder interaction; numerical simulation has become an important technical way to study the selective-laser-melting process. A coupled thermal–fluid model of the SLM single-layer melt-channel-forming process is constructed based on hydrodynamic theory for AlSi10Mg metallic materials, and the SLM single-layer melt-channel-forming process is investigated by combining parametric experiments and numerical simulation me

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Wei, P. S., H. J. Liu, and C. L. Lin. "Scaling weld or melt pool shape induced by thermocapillary convection." International Journal of Heat and Mass Transfer 55, no. 9-10 (2012): 2328–37. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2012.01.034.

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Dissertations / Theses on the topic "Melt pool convection"

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Lee, Joon Yul. "Transient thermal convection in laser melt stationary weld pool /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu14876852049678.

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Zhao, Yuer. "A Numerical Study of Melt Pool Heat Transfer in the IVR of a PWR." Thesis, KTH, Fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297867.

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This thesis aims to provide the thermal condition of melt pool convection by CFD simulation, which is important to the assessment of the invessel melt retention (IVR) strategy widely adopted in Generation III pressurized water reactors (PWRs). As a severe accident mitigation measure, the IVR strategy is realized through external cooling of the lower head of a reactor pressure vessel (RPV). To achieve the coolability and retention of the corium pool in the RPV lower head, the heat flux at the outer surface of the vessel should be less than the critical heat flux (CHF) of boiling around the lowe

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Tran, Chi Thanh. "The Effective Convectivity Model for Simulation and Analysis of Melt Pool Heat Transfer in a Light Water Reactor Pressure Vessel Lower Head." Doctoral thesis, Stockholm : Division of Nuclear Power Safety, Royal Institute of Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10671.

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Tran, Chi Thanh. "Development, validation and application of an effective convectivity model for simulation of melt pool heat transfer in a light water reactor lower head." Licentiate thesis, Stockholm : Fysik, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4559.

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Njinju, Emmanuel A. "A Geodynamic Investigation of Magma-Poor Rifting Processes and Melt Generation: A Case Study of the Malawi Rift and Rungwe Volcanic Province, East Africa." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/101867.

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Our understanding of how magma-poor rifts accommodate strain remains limited largely due to sparse geophysical observations from these rift systems. To better understand magma-poor rifting processes, chapter 1 of this dissertation is focused on investigating the lithosphere-asthenosphere interactions beneath the Malawi Rift, a segment of the magma-poor Western Branch of the East African Rift (EAR). Chapter 2 and 3 are focused on investigating the sources of melt beneath the Rungwe Volcanic Province (RVP), an anomalous volcanic center located at the northern tip of the Malawi Rift. In chapter 1

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Liu, Han-Jen, and 劉瀚仁. "Scaling Weld or Melt Pool Shape Affected by Thermocapillary Convection with High Prandtl number." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/98456997020361865364.

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碩士<br>國立中山大學<br>機械與機電工程學系研究所<br>99<br>The molten pool shape and thermocapillary convection during melting or welding of metals or alloys are self-consistently predicted from scale analysis. Determination of the molten pool shape and transport variables is crucial due to its close relationship with the strength and properties of the fusion zone. In this work, surface tension coefficient is considered to be negative, indicating an outward surface flow, whereas high Prandtl number represents a thinner thickness of the thermal boundary layer than that of momentum boundary layer. Since Marangoni nu

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Books on the topic "Melt pool convection"

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Yang, Kun. Observed Regional Climate Change in Tibet over the Last Decades. Oxford University Press, 2017. http://dx.doi.org/10.1093/acrefore/9780190228620.013.587.

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The Tibetan Plateau (TP) is subjected to strong interactions among the atmosphere, hydrosphere, cryosphere, and biosphere. The Plateau exerts huge thermal forcing on the mid-troposphere over the mid-latitude of the Northern Hemisphere during spring and summer. This region also contains the headwaters of major rivers in Asia and provides a large portion of the water resources used for economic activities in adjacent regions. Since the beginning of the 1980s, the TP has undergone evident climate changes, with overall surface air warming and moistening, solar dimming, and decrease in wind speed.

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Book chapters on the topic "Melt pool convection"

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Ehrhard, P., and CH Hölle. "Buoyancy-Driven Melt Pool Convection during Laser Surface Treatment." In Interactive Dynamics of Convection and Solidification. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2809-4_34.

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Nahr, Florian, and Michael Schmidt. "Laser Beam Melting of Metals." In Springer Tracts in Additive Manufacturing. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-78350-0_8.

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Abstract In the powder bed fusion of metals applying a laser beam (PBF-LB/M), components are built layer-wise by melting a thin bed of powder using a laser beam as an energy source. The build chamber is filled with shielding gas using purified Argon or Nitrogen to prevent oxidation and allow for efficient heat conduction and convective cooling of the build surface. Although laser beam melting operates at ambient temperatures, most of the PBF-LB/M machines are capable of substrate preheating. The powder particles absorb the photons in the first microseconds after the impact of the laser beam an

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Nourgaliev, R. R., T. N. Dinh, and B. R. Sehgal. "Natural Convection in Volumetrically Heated and Side-Wall Heated Melt Pools: Three Dimensional Effects." In Notes on Numerical Fluid Mechanics (NNFM). Vieweg+Teubner Verlag, 1996. http://dx.doi.org/10.1007/978-3-322-89838-8_27.

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Xiao, Xianfeng, Cong Lu, Yanshu Fu, Xiaojun Ye, and Lijun Song. "Progress on Experimental Study of Melt Pool Flow Dynamics in Laser Material Processing." In Liquid Metals [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97205.

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Laser material processing has becoming a rapid developing technology due to the flexibility of laser tool. Melt pool is the main product from the interaction between laser and material and its features has a great impact on the heat transfer, solidification behavior, and defects formation. Thus, understanding changes to melt pool flow is essential to obtain good fabricated product. This chapter presents a review of the experimental studies on melt pool flow dynamics for laser welding and laser additive manufacturing. The mechanisms of melt pool convection and its principal affecting factors ar

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Conference papers on the topic "Melt pool convection"

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Gubaidullin, A. A., and B. R. Sehgal. "Simeco Tests in a Melt Stratified Pool." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22709.

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In the last phase of the core degradation, an oxidic melt pool of mainly UO2, ZrO2, and unoxidized Zircaloy and stain-less steel will form in the lower head of the RPV (Theofanous et al., 1996). A molten metal layer (composed mainly of Fe and Zr) will rest on the top of the crust of the oxidic pool. A thin oxidic crust layer of frozen core material is formed on the vessel’s inside wall. In this bounding configuration, thermal loads to the RPV walls are determined by natural convection heat transfer driven by internal heat sources. Decay heat from fission products is assumed to be generated uni

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Luo, Simin, Xin'an Wang, Yapei Zhang, Dalin Zhang, Suizheng Qiu, and Guanghui Su. "Numerical Research on Melt Pool Flow Characteristics Under Rolling Condition." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81994.

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In-vessel-retention (IVR) has become an important subject of severe accident mitigation strategy. Up to now, many experimental and numerical investigations have been performed on the natural convection characteristics in melt pools with volumetric heating. But these studies are limited to the melt pools under static condition. As floating nuclear reactors become increasingly popular among both commercial and military ships, for successful application of IVR in this occasion, research should be done on the heat transfer characteristics of melt pool under moving conditions. Currently, the specia

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Chakraborty, Nilanjan, and Suman Chakraborty. "Modelling of Turbulent Transport in Laser Melt Pools." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45774.

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In this paper, we present a modified k-ε model capable of addressing turbulent molten metal-pool convection in the presence of a continuously evolving phase-change interface during a laser melting process. The phase change aspects of the present problem are addressed using a modified enthalpy-porosity technique. The k-ε model is suitably modified to account for the morphology of the solid-liquid interface. A three-dimensional mathematical model is subsequently utilised to simulate a typical laser melting process with high power, where effects of turbulent transport can actually be realised. In

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Fan, T. H., and F. B. Cheung. "Modeling of Transient Turbulent Natural Convection in a Melt Layer With Solidification." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0087.

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Abstract The phenomenon of turbulent natural convection in a horizontal heat-generating melt layer with solidification taking place at the cooled upper and lower boundaries is investigated theoretically. The objective is to determine the transient behavior of the crust at the upper and lower surfaces and the effect of crust formation on the turbulent natural convection process in the melt layer. Various surface temperatures, latent heats, and the heat source strengths are considered along with the effects of the Stefan number and Rayleigh number. Special attention is given to the interaction b

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Zhou, Yukun, Yapei Zhang, Simin Luo, et al. "COPRA Experiments on Melt Pool Behavior With Eutectic NaNO3-KNO3 Simulant." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81367.

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The COPRA experiments were performed to study the natural convection heat transfer behavior in a large-scale homogeneous melt pool inside the reactor pressure vessel lower plenum. The test section consists of a two-dimensional 1/4 circular slice with an inner radius of 2.2 m. A non-eutectic binary mixture 20%NaNO3-80%KNO3 was selected as melt simulant in the previous tests and the Rayleigh number of the melt pool reached up to 1016. In this paper, the working fluid was a eutectic binary mixture 50%NaNO3-50%KNO3. The melt pool temperature, heat flux distribution and crust thickness were obtaine

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Mistry, Utsavkumar, and Madhu Vadali. "Influence of Surface Geometry on Melt Pool Flows and Shape in Pulsed Laser Surface Melting." In ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-60460.

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Abstract Pulsed Laser Surface Melting (pLSM) is a technique that offers an efficient way to modify the geometry surfaces without any addition or removal of material. In pLSM, an incident laser beam melts a small region on the surface and induces surface tension and viscosity-driven flows that modify the surface geometry. Initial surface geometry plays an important role in deciding the melt pool flows and shape as it governs the initial surface tension acting on the melt pool. In this paper, we present a systematic numerical study that captures the effects of initial geometries using a two-dime

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Kamara, A. M., W. Wang, S. Marimuthu, A. J. Pinkerton, and L. Li. "Influence of melt pool convection on residual stress induced in laser cladding and powder deposition." In PICALO 2010: 4th Pacific International Conference on Laser Materials Processing, Micro, Nano and Ultrafast Fabrication. Laser Institute of America, 2010. http://dx.doi.org/10.2351/1.5057208.

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Zhang, Yapei, Luteng Zhang, Wenxi Tian, Suizheng Qiu, and Guanghui Su. "Numerical Study on the Heat Transfer Characteristics of COPRA-L1 Melt Pool Based on the LES Method." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60857.

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Natural convection in a volumetrically heated fluid is of significant importance related to the In-Vessel Retention (IVR) issue. The COPRA facility is designed to simulate the lower plenum of reactor vessel at 1:1 scale for the Chinese advanced PWR, which is a two-dimensional 1/4 circular slice structure with an inner radius of 2.2 m. Water was used as simulant in COPRA-L1 tests. Due to the full scale geometry, The Rayleigh numbers within the corium pools could reach to 1016, matching those in the prototypical situation during severe accident. Due to the high Rayleigh numbers and high turbulen

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Acharya, Ranadip, Rohan Bansal, Justin J. Gambone, and Suman Das. "Modeling of Solidification and Microstructure Evolution in the Scanning Laser Epitaxy (SLE) Process for Additive Manufacturing With Nickel-Base Superalloy Powders." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66807.

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This paper investigates effects of natural and Marangoni convection on the resultant solidification microstructure in the scanning laser epitaxy (SLE) process. SLE is a laser-based additive manufacturing process that is being developed at the Georgia Institute of Technology for the additive manufacturing of nickel-base superalloys components with equiaxed, directionally-solidified or single-crystal microstructures through the laser melting of alloy powders onto superalloy substrates. A combined thermal and fluid flow model of the system simulates a heat source moving over a powder bed and dyna

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Han, L., and J. Choi. "Two Dimensional Modeling of Laser Cladding With Droplet Injection." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47295.

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Directed Metal/Material Deposition (DMD) process is one of additive manufacturing processes based on laser cladding process. A full understanding of laser cladding process is a must to make the DMD process consistent and robust. A two dimensional mathematical model of laser cladding was developed to understand the influence of fluid flow to the mixing, dilution, and deposition dimension, incorporating melting, solidification, and evaporation phenomena. The fluid flow in the melt pool driven by thermal capillary convection and energy balance at liquid-vapor and solid-liquid interface was invest

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Reports on the topic "Melt pool convection"

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Barney, R. Investigation of Marangoni convection with high-fidelity simulations for metal melt pool dynamics. Office of Scientific and Technical Information (OSTI), 2019. http://dx.doi.org/10.2172/1573160.

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Stratton, R. A., and A. J. Stirling. Examining the dynamical response to convective heating using an idealised version of the Met Office’s Unified Model. Met Office, 2024. http://dx.doi.org/10.62998/ouao1203.

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In global circulation models, poor coupling between convection parametrizations and the resolved dynamics poses significant obstacles to the representation of a range of convectively coupled atmospheric phenomena. Here we focus on one part of this coupling and ask whether the dynamical response to convection can adequately be captured when convection is parametrized only as heat and moisture sources to the resolved scale, (as is usually the case in convection parametrizations), and without including either mass, or vertical momentum transport terms. To this end, a ‘perfect’ convection parametr

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