Levitated Liquid Dynamics in Reduced Gravity and Gravity-Compensating Magnetic Fields

Bojarevics, Valdis; Hyers, R. W.

doi:10.1007/s11837-012-0417-y

Cited by 14 publications

(5 citation statements)

References 17 publications

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“…This behaviour was also predicted in numerical simulations [5]. The combination of AC and DC magnetic fields was recently recognized as an efficient tool for the thermo-physical property measurements without a contact to contaminating walls [6,7]. If the contact is avoided, thermal losses can be limited only by radiation and possible evaporation to permit investigation of materials at extreme temperatures.…”

Section: Introductionmentioning

confidence: 70%

“…In this case the effective viscosity is almost at the laminar level and the velocity field is more intense than in the case without the DC field. The turbulence modelling uses terms sensitive to the presence of the DC field, see the description in [5,7]. It is remarkable that a higher intensity magnetic field (5 Teslas) damps the mean recirculating flow, keeps the turbulent viscosity at the laminar level, but allows a new type of intense surface oscillation along the magnetic field as can be seen in the Fig.…”

Section: Levitation In Full Gravitymentioning

confidence: 99%

“…12 (right). We refer to the previous publications [5,7] for more details about oscillation frequencies in a strong DC magnetic field.…”

Section: Levitation In Full Gravitymentioning

confidence: 99%

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Dual frequency AC and DC magnetic field levitation melting of metals

Bojarevics

Pericleous

2014

International Journal of Applied Electromagnetics and Mechanics

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Dual frequency AC magnetic field effects are analyzed in the case of levitated samples heated, melted and confined. The time dependent numerical models based on accurate spectral approximation give an insight to oscillation patterns and stability conditions for a copper sample both in solid and liquid state after the melting stage. Application to microgravity experiments planned at International Space Station and the full gravity magnetic levitation for the similar sample are presented.

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Section: Introductionmentioning

confidence: 70%

Section: Levitation In Full Gravitymentioning

confidence: 99%

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Dual frequency AC and DC magnetic field levitation melting of metals

Bojarevics

Pericleous

2014

International Journal of Applied Electromagnetics and Mechanics

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“…The first subtype of such models involves convective flow inside the melted batch [ 58 , 59 , 60 ]. The second subtype deals with the shape of the molten batch and its oscillations [ 61 , 62 , 63 ]. The third, on the other hand, is about temperature fields and phase transformations [ 64 , 65 , 66 ].…”

Section: Resultsmentioning

confidence: 99%

A Simulation Model for the Inductor of Electromagnetic Levitation Melting and Its Validation

et al. 2023

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This article presents a numerical model of electromagnetic levitation melting and its experimental validation. Levitation melting uses the phenomenon of magnetic induction to float a melted, usually metallic, conductor in an electromagnetic field. With the appropriate configuration of the coil (the source of the alternating magnetic field), the eddy currents induced in the molten batch interact with the coil magnetic field, which causes the melted metal to float without direct contact with any element of the heating system. Such a contactless process is very beneficial for melting very reactive metals (e.g., titanium) or metals with a high melting point (e.g., tungsten). The main disadvantage of levitation melting is the low efficiency of the process. The goal of the authors is to develop, by means of a numerical simulation and optimization tools, a system for levitation melting with acceptable efficiency. To achieve this, it is necessary to develop a reliable and representative computational model. The proposed model includes an analysis of the electromagnetic field, with innovative modeling of the convective heat transport. Experimental validation of the model was performed using aluminum alloy, due to the lack of the need to use a protective atmosphere and the ease of measurements. The measurements included electrical values, the melted batch positions during levitation, the melting time, and the temperature distribution in its area. The verification showed that the compliance between the computational model and the simulation for the position of the batch was accurate to 2 mm (6.25%), and the consistency of the batch melting time was accurate to 5 s (5.49%). The studies confirmed the good representativeness of the developed numerical model, which makes it a useful tool for the future optimization of the levitation melting system.

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“…The eddy effect gave rise to higher magnetic force, velocity and unevenly distributed temperature in the levitation process. In microgravity, Bojarevics et al [163] performed a numerical simulation on the melting of silicon droplets in an AC+DC magnetic field and presented the typical temperature and velocity field. The stable droplet suspension helped in studying heat transfer in microgravity environments [164], ensuring demanding chemical reactions without bacterial and virus pollution, smelting high-purity materials [165], promoting the fusion of incompatible alloys [166] and optimizing the welding effect [167].…”

Section: Discussionmentioning

confidence: 99%

Droplet Manipulation under a Magnetic Field: A Review

Zhu

Wang

et al. 2022

Biosensors

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The magnetic manipulation of droplets is one of the emerging magnetofluidic technologies that integrate multiple disciplines, such as electromagnetics, fluid mechanics and so on. The directly driven droplets are mainly composed of ferrofluid or liquid metal. This kind of magnetically induced droplet manipulation provides a remote, wireless and programmable approach beneficial for research and engineering applications, such as drug synthesis, biochemistry, sample preparation in life sciences, biomedicine, tissue engineering, etc. Based on the significant growth in the study of magneto droplet handling achieved over the past decades, further and more profound explorations in this field gained impetus, raising concentrations on the construction of a comprehensive working mechanism and the commercialization of this technology. Current challenges faced are not limited to the design and fabrication of the magnetic field, the material, the acquisition of precise and stable droplet performance, other constraints in processing speed and so on. The rotational devices or systems could give rise to additional issues on bulky appearance, high cost, low reliability, etc. Various magnetically introduced droplet behaviors, such as deformation, displacement, rotation, levitation, splitting and fusion, are mainly introduced in this work, involving the basic theory, functions and working principles.

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Levitated Liquid Dynamics in Reduced Gravity and Gravity-Compensating Magnetic Fields

Cited by 14 publications

References 17 publications

Dual frequency AC and DC magnetic field levitation melting of metals

Dual frequency AC and DC magnetic field levitation melting of metals

A Simulation Model for the Inductor of Electromagnetic Levitation Melting and Its Validation

Droplet Manipulation under a Magnetic Field: A Review

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