Formation of uniformly sized metal droplets from a capillary jet by electromagnetic force

Shimasaki, Shin-ichi; Shoji, Tetsuya

doi:10.1016/j.apm.2010.09.033

Cited by 15 publications

(6 citation statements)

References 12 publications

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“…Notably, the granulation process study in the above articles using the computational fluid dynamics methods makes it possible to determine the influence of technological regimes and the prillers design on the main process parameters. Also, in many studies, it is indicated that the numerical modeling results of processes occurring in prillers and drying towers give a good similarity with the results of the experiments [10][11][12].…”

Section: Literature Reviewmentioning

confidence: 61%

Numerical Simulation of the Perforated Shell’s Oscillations in a Vibrational Priller

Demianenko

Volf

Skydanenko

et al. 2020

JES

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The widespread catalysts and nuclear fuel production are the sol-gel technology, including several stages, namely, the raw materials preparation, dispersing it into drops, the granules formation in gas and then in liquid media, granules removal with liquid separation. The vibration granulator is proposed to use on the dispersion stage. One of the problems in their development is determining the vibrational characteristics of a perforated bucket filled with liquid to a certain level. Considering that vibrations are transmitted from the emitter disk through the liquid melt and cause vibrations of the perforated shell, in research, it was decided to use the Fluent Flow and the Transient Structural modules of the ANSYS Workbench software. As a result, numerical simulation results of the emitter disk vibration effect on the cylindrical body are presented. Also, parameters of a discrete mathematical model are evaluated by the bucket vibrations characteristics. The corresponding model considers the inertial, stiffness, and damping properties of functional elements. Additionally, according to the modal analysis results of the priller body, it was determined the eigenfrequencies of the hydromechanical system. Finally, based on the numerical simulation results and their analysis using Fourier transformations, it was determined that the oscillations of the lower part of the bucket, consisting of two harmonic oscillations that equal 230 Hz and 520 Hz.

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Section: Literature Reviewmentioning

confidence: 61%

Numerical Simulation of the Perforated Shell’s Oscillations in a Vibrational Priller

Demianenko

Volf

Skydanenko

et al. 2020

JES

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show abstract

“…Apart from that, a method of droplet generation based on applying a modulated AC high-frequency magnetic field in the localized region of capillary break-up has been studied by other authors using numerical modeling and experiments. [26,27] It was found that the droplet size can be tailored by the frequency of the intermittent electromagnetic pinch force.…”

Section: A ø40 MM Tantalum Electrodementioning

confidence: 99%

Numerical Modeling and Optimization of Electrode Induction Melting for Inert Gas Atomization (EIGA)

Spitans

Franz

Baake

2020

Metall Mater Trans B

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(EIGA) is the state-of-the-art process for the high-quality spherical powder production for additive manufacturing needs. The growing demand for EIGA powders drives the interest for the scale-up of well-established atomization of small Ø50 mm Ti-6Al-4V electrodes, as well as atomization of new refractory materials like Tantalum. However, during first tests with Ø150 mm Ti-6Al-4V and Ø50 mm Tantalum electrodes, the difficulties with melting stability were observed. In order to overcome these difficulties and to improve understanding of details of inductive coupling and favorable melting conditions, a numerical model for the electrode induction melting has been developed and applied.

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“…For the generation of low melting point droplets (T melt < 427 °C), materials in the liquid phase are used the most frequently. Methods of continuous droplet generation are based on liquid metal stream break up due to induced stream instability which can be caused by low-energy mechanical vibration (Liu and Omre 2001), or by electromagnetic forces (Shimasaki and Taniguchi, 2009). In DoD generation a liquid metal is squeezed out through a nozzle by applying a high energy pulse which can be generated by a piezoelectric actuator (Wehl et al, 2003), a vibration plunger (Sohn and Yang, 2005), or a pneumatic actuator (Cheng et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Drop on demand generation from a metal wire by means of an annular laser beam

Govekar

Kuznetsov

Jerič

2016

Journal of Materials Processing Technology

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In the paper a novel system for drop-on-demand (DoD) generation from a metal wire is presented, whose main component is a newly developed laser droplet generation head, consisting of annular laser beam shaping optics and a wire feeding system. In the pendant droplet formation phase of the DoD generation, a laser pulse is used to melt the wire-end, which is fed into the focus of an annular laser beam. The formed pendant droplet is then detached by means of a detachment pulse, which induces Rayleigh-Plateau instability of the molten column of wire above the neck of the pendant droplet. The main process parameters, including the laser pulse and wire feeding parameters as well as the additional parameters which influence particular phases of the DoD generation process, have been identified. The empirical correlations between the influencing process parameters and the droplet characteristics, including droplet diameter and temperature, were determined, based on the analysis of high speed IR records of the process, images being acquired by an optical microscope and temperature data being acquired by pyrometers. As an example, DoD generation from a commercially pure 99.6 % Ni wire (Nickel 200) of 0.6 mm diameter is considered. It is shown that droplets with diameters ranging from 0.85 to 1.25 mm can be generated, with a resolution of 50 µm and a standard deviation of 15 µm. The temperature of the detached droplet remains above the melting point of the Ni wire, and increases with the droplet diameter within the range from 1650 °C to 1750 °C. Some examples of Ni droplets deposited on a Ti sheet surface are presented, with the aim of demonstrating the capability of the proposed system, and motivating further applications in which drops on demand having a high temperature and a precisely defined diameter need to be generated, while limiting the thermal loading of the surroundings.

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Formation of uniformly sized metal droplets from a capillary jet by electromagnetic force

Cited by 15 publications

References 12 publications

Numerical Simulation of the Perforated Shell’s Oscillations in a Vibrational Priller

Numerical Simulation of the Perforated Shell’s Oscillations in a Vibrational Priller

Numerical Modeling and Optimization of Electrode Induction Melting for Inert Gas Atomization (EIGA)

Drop on demand generation from a metal wire by means of an annular laser beam

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