scholarly journals Heat and Mass Transfer of Additive Manufacturing Processes for Metals

2019 ◽  
Author(s):  
Zhengying Wei ◽  
Jun Du
Keyword(s):  
Mass Transfer ◽  
Additive Manufacturing ◽  
Heat And Mass Transfer ◽  
Manufacturing Processes

scholarly journals Modelling of Heat and Mass Transfer for Wire-Based Additive Manufacturing Using Electric Arc and Concentrated Sources of Energy

2018 ◽  
Vol 7 (4.38) ◽  
pp. 741
Author(s):  
Dmitriy Trushnikov ◽  
Anatoly Perminov ◽  
Shengyong Pang ◽  
K. P. Karunakaran ◽  
Vladimir Belenkiy ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Phase Transitions ◽  
Additive Manufacturing ◽  
Heat Source ◽  
Heat And Mass Transfer ◽  
Initial Temperature ◽  
Fluid Motion ◽  
Density Variation ◽  
Phase Region ◽  
Two Phase

The paper presents a model developed by the authors and aimed to describe heat and mass transfer during wire-based additive manufacturing, when electron beam, plasma or arc are used as energy sources in case of non-consumable electrode welding. The model describes non-stationary and non-equilibrium conjugated processes of heat and mass transfer in free-surface liquid metal. The solution of differential equations of viscous fluid motion (Navier-Stokes), with convective terms and at laminar flow, has become the model base. Melting and crystallization of the metal is recognized by heat release in a two-phase region. The material density variation during phase transitions of the first and the second order can be described by introducing a certain dependence on temperature. The model is able to consider the use of preliminary and additional induction heating by changing the initial temperature and establishing an additional distributed bulk heat source. Variables for the simulation of heat and mass transfer during additive formation are the intensity and type of the heat source, the plate initial temperature, the power density distribution, the intensity of the additional bulk heating, the dependence of material thermal and physical characteristics on temperature, the characteristics of the phase transitions, the motion velocity of the heat source, the rate of wire feeding. 

scholarly journals Mathematical modeling of the electron-beam wire deposition additive manufacturing by the smoothed particle hydrodynamics method

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Dmitriy Nikolayevich Trushnikov ◽  
Elena Georgieva Koleva ◽  
Roman Pozolovich Davlyatshin ◽  
Roman Mikhailovich Gerasimov ◽  
Yuriy Vitalievich Bayandin
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Electron Beam ◽  
Additive Manufacturing ◽  
Heat And Mass Transfer ◽  
Smoothed Particle Hydrodynamics ◽  
Lagrangian Description ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Smoothed Particle Hydrodynamics Method

Abstract Background The actual problem for calculating a shape of free surface of the melt when analyzing the processes of wire-based electron-beam surfacing on the substrate, being introduced into additive manufacturing, is the development of adequate mathematical models of heat and mass transfer. The paper proposed a formulation of the problem of melt motion in the framework of the Lagrangian description. The mathematical statement includes the balance equations for mass, momentum and energy, and physical equations for describing heat and mass transfer. Methods The smoothed particle hydrodynamics method was used for numerical simulation of the process of wire-based electron-beam surfacing on the substrate made from same materials (titanium or steel). A finite-difference analog of the equations is given and the algorithm for solving the problem is implemented. To integrate the discretized equations Verlet method was utilized. Algorithms are implemented in the open software package LAMMPS. Results The numerical simulation results allow the estimation of non-stationary volume temperature distributions, melt flow velocities and pressures, and characteristics of process. Conclusion The possibility of applying the developed mathematical model to describe additive production is shown. The comparison of numerical calculations with experimental studies showed good agreement.

Convective Heat and Mass Transfer in the Stagnation Region of a Laminar Planar Jet Impinging on a Moving Surface

1991 ◽  
Vol 113 (3) ◽  
pp. 563-570 ◽  
Author(s):  
D. A. Zumbrunnen
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Similarity Solution ◽  
Numerical Solutions ◽  
Stokes Equations ◽  
Jet Impingement ◽  
Surface Velocity ◽  
Manufacturing Processes ◽  
Stagnation Region ◽  
Planar Jet

Manufacturing processes frequently employ impinging jets to cool or dry a material. Materials are often in motion since many manufacturing processes are designed to produce large quantities of a product. In some cases, the surface velocity can exceed or be comparable to the jet impingement velocity. In this study, the stagnation region of a laminar, planar jet is considered where surface motion is directed perpendicular to the jet plane. A similarity solution to the Navier-Stokes equations is formulated to determine the flow velocity in the stagnation region. Heat and mass transfer distributions are determined from numerical solutions to the conservation equations for energy and species, where velocity components are calculated from the similarity solution. Restrictions regarding the use of heat and mass transfer correlations, which are commonly developed with experimental apparatuses where the impingement surface is stationary, are provided.

scholarly journals Additive Manufacturing in the Development of Scalable Models of Technological Equipment

2021 ◽  
Vol 346 ◽  
pp. 01040
Author(s):  
Ildar Sabanaev ◽  
Alexey Dinmuhametov
Keyword(s):  
Mass Transfer ◽  
Additive Manufacturing ◽  
3D Printing ◽  
Heat And Mass Transfer ◽  
Research Work ◽  
Great Accuracy ◽  
Technological Equipment ◽  
Industrial Chemistry ◽  
Scale Models ◽  
Petrochemical Industries

The article presents the results of a study of effective methods for the development of full-scale models of technological equipment for chemical and petrochemical industries based on the use of additive manufacturing. It is shown that 3D printing can be used to prepare and test various elements of heat and mass transfer devices with great accuracy and in the shortest possible time. It is concluded that the use of additive manufacturing allows for significant efficiency of research work in the field of industrial chemistry and petrochemistry.

Heat-and-mass transfer in a confined-jet flow plasma reactor during nanopowder manufacturing processes

2012 ◽  
Vol 46 (4) ◽  
pp. 279-282 ◽  
Author(s):  
A. G. Astashov ◽  
A. V. Samokhin ◽  
Yu. V. Tsvetkov ◽  
N. V. Alekseev
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Plasma Reactor ◽  
Jet Flow ◽  
Manufacturing Processes
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