Density and Thermal Conductivity Measurements for Silicon Melt by Electromagnetic Levitation under a Static Magnetic Field

Inatomi, Yuko; Onishi, Fumitomo; Nagashio, Kosuke; Kuribayashi, Kazuhiko

doi:10.1007/s10765-007-0160-8

Cited by 33 publications

(23 citation statements)

References 25 publications

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“…[7] and [10], the vector potential A is obtained. Then the current density J and magnetic flux intensity B can be solved.…”

Section: A Electromagnetic Fieldsmentioning

confidence: 99%

“…In addition, thermophysical properties of molten materials can also be measured by EML technique, such as surface tension, electrical conductivity, viscosity, and thermal conductivity. [1][2][3][4][5][6][7] Since Muck [8] first proposed the idea of electromagnetic levitation in 1923, several devices have been designed for positioning and melting materials, among which the TEMPUS unit developed by German scientists is well known for separately controlling levitation process and melting process. Very encouraging results have been gained through several Space Shuttle missions using the TEMPUS unit.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Eddy Effect of Coils on Flow and Temperature Fields of Molten Droplet in Electromagnetic Levitation Device

Lin

Shi

2015

Metall Mater Trans B

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In this work, the influence of eddy effect of coils on magnetic, flow, and temperature fields in an electromagnetically levitated molten droplet was investigated by a serial of axisymmetric numerical simulations. In an electromagnetic levitation device, both metal droplet and coils are conductive materials, therefore the distributions of current density in them should be nonuniform as a result of the eddy effect. However, in previous works, the eddy effect was considered alone in metal droplet but ignored in coils usually. As the distance of coils and metal droplet is several millimetres in general, the non-uniform distribution of current density in coils actually gives important influences on calculations of magnetic, flow, and temperature fields. Here, we consider the eddy effect both in metal droplet as well as that in coils simultaneously. Lifting force, absorbed power, fluid flow, and temperature field inside a 4-mm radius molten copper droplet as a typical example are then calculated and analyzed carefully under such condition. The results show that eddy effect leads to higher magnetic force, velocity, and temperature in both levitating and melting processes than those when the eddy effect is ignored. What is more, such influence increases as the distance of droplet and coils becomes closer, which corresponds to experimental measurement. Therefore, we suggest that eddy effect of coils should be considered in numerical simulation on this topic to obtain more reliable result.

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“…[7] and [10], the vector potential A is obtained. Then the current density J and magnetic flux intensity B can be solved.…”

Section: A Electromagnetic Fieldsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of Eddy Effect of Coils on Flow and Temperature Fields of Molten Droplet in Electromagnetic Levitation Device

Lin

Shi

2015

Metall Mater Trans B

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“…Examples of the results of this type of density measurement of molten materials using EML can be found elsewhere. [10][11][12] In contrast, ESL utilizes repulsive Coulomb forces to cancel gravity. The size and mass of the sample generally are 2 to 3 mm in diameter and~40 mg, respectively.…”

mentioning

confidence: 99%

Measurement of Density of Fe-Co Alloys Using Electrostatic Levitation

Lee

Rodriguez

Hyers

et al. 2015

Metall Mater Trans B

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The density of a series of five different iron-cobalt alloys was measured using electrostatic levitator processing. Each sample was processed through multiple thermal cycles and the liquid density was measured, while the superheated sample was cooled down to its undercooled state. The volume of the sample was estimated by analyzing captured high-speed video data of the projected shape of the sample. The mass change during the melt cycle was also tracked using Langmuir's equation of mass evaporation. The density was then calculated as a function of temperature based on these measurements of volume and mass. Density values obtained showed higher precision than existing data from the literature obtained using a variety of different techniques, although the accuracy was consistent.

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“…7(a). It is mainly due to the density difference between a-Si (2.29 g/cm 3 ) and molten silicon (2.53 g/cm 3 ) [21,22]. This $10% of volume change was the origin of stress at the interface between the a-Si and crystallized regions.…”

Section: Article In Pressmentioning

confidence: 99%

Crystallization of amorphous silicon thin films using nanoenergetic intermolecular materials with buffer layers

Lee¹,

Jeong²,

Kim³

et al. 2009

Journal of Crystal Growth

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Density and Thermal Conductivity Measurements for Silicon Melt by Electromagnetic Levitation under a Static Magnetic Field

Cited by 33 publications

References 25 publications

The Influence of Eddy Effect of Coils on Flow and Temperature Fields of Molten Droplet in Electromagnetic Levitation Device

The Influence of Eddy Effect of Coils on Flow and Temperature Fields of Molten Droplet in Electromagnetic Levitation Device

Measurement of Density of Fe-Co Alloys Using Electrostatic Levitation

Crystallization of amorphous silicon thin films using nanoenergetic intermolecular materials with buffer layers

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