3D modelling of the synthesis of copper nanoparticles by means of a DC transferred arc twin torch plasma system

Abstract

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Quasi-direct numerical simulations of the flow characteristics of a thermal plasma reactor with counterflow jet

“…Although some progress has been made in the impingement between the thermal plasma and the quench gas, the mass, momentum and energy transfer characteristics in the reactor are unclear due to the limitation of the experimental diagnostic methods [6,[8][9][10]. Moreover, the steady-state assumption, two-dimensional axisymmetric computational domain, laminar and e k turbulence model were employed to study the mean flow field in the reactor by numerical simulations [5,6,[11][12][13][14][15][16][17], in which the characteristics of three-dimensional asymmetry and unsteady state in the reactor cannot be resolved.…”

Special issue on thermal-plasma–material interactions

“…The papers cover a wide range of thermal plasma applications, including tungsten inert gas [1-5] and gas metal arc [6,7] welding, xenon short-arc lamps [8], circuit interruption [9][10][11], nanoparticle synthesis [12-14] and plasma ignition [15]. Different plasma sources, including dc arcs in a variety of configurations [1-6, 8, 13, 16-18], radio frequency inductively coupled plasmas [12] and ablation-controlled arcs [9, 10], are considered.The majority of the contributed papers report mathematical modelling studies [4][5][6][7][8][9][11][12][13][14][15], and most of these supported by experimental validation of the results obtained, which plays a crucial role in model calibration and development. Other papers focus on measurements of the plasma to elucidate its interaction with electrodes or surrounding materials [1-3, 10, 17, 18].A review article considers the state-of-the-art and the remaining challenges in modelling arc-electrode interactions [16].…”

“…The majority of the contributed papers report mathematical modelling studies [4][5][6][7][8][9][11][12][13][14][15], and most of these supported by experimental validation of the results obtained, which plays a crucial role in model calibration and development. Other papers focus on measurements of the plasma to elucidate its interaction with electrodes or surrounding materials [1-3, 10, 17, 18].…”

“…Examples are given of titanium powder vaporization in a novel double-coil 'tandem' induction plasma torch [12], copper nanoparticle synthesis by means of a DC transferred arc twin-torch plasma system [13] and the vaporization of a single, micron-sized copper particle immersed in a thermal plasma independent of its source [14]. The latter two studies [13,14] used models that include the important effect of volumetric radiative energy losses from the generated metal vapours on the plasma temperature fields and consequently on the particle evaporation process.The contribution of all of the authors to the success of this special issue is gratefully acknowledged.…”