Study of Particle Settling and Sedimentation in a Crucible Furnace

Badowski, Mark; Gökelma, Mertol; Morscheiser, Johannes; Dang, Thien Ngon; Brun, Pierre Le; Tewes, Sebastian

doi:10.1002/9781119093435.ch162

Cited by 4 publications

(6 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the flow is non-uniform, (flow in upwards direction close to the walls and in downwards direction at the center) it can promote or hinder the settling in different pathways. [15] The settling velocity can be also affected by interactions between particles. This interaction increases the drag during settling and causes a disagreement between theoretical and experimental data.…”

Section: Modeling Results Based On Limca Datamentioning

confidence: 99%

“…Al 2 O 3 films corresponds to approximately 50 pct of the inclusions in similar melts with > 99.7 pct purity as reported in the previous work. [15] The thickness of Al 2 O 3 thin films is usually under 1 lm and the cross-section can vary between 10 and 500 lm. [23] Al 4 C 3 particles are usually very fine and cannot be detected by LiMCA since it is not capable of measuring the particles below 17 microns with standard setups.…”

Section: A Characterization Of the Inclusions Present In A 998 Pct mentioning

confidence: 99%

“…They reported that sedimentation in crucible furnaces is strongly influenced by thermal convection especially if the melt contains a large amount of films. [15] The LiMCA measurement technique is based on the electric sensing zone principle and tracks the inclusions by measuring the change in electrical resistance between electrodes. This resistance change is caused by a particle passing through the orifice of a glass tube immersed in aluminum melt and obtained voltage peaks define the inclusion size and concentration.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Shape Factor Effect on Inclusion Sedimentation in Aluminum Melts

Gökelma

Einarsrud

Tranell

et al. 2020

Metall Mater Trans B

Self Cite

View full text Add to dashboard Cite

The quality requirements of aluminum products are steadily increasing, and the presence of non-metallic inclusions have a large impact on the quality of aluminum products. Sedimentation is a widely applied technique to remove inclusions and the settling characteristic of particles is one of the most important parameters determining the removal efficiency. The settling characteristics can be modeled analytically through different approaches. A comparison of settling according to the Stokes and Schiller and Naumann drag force formulations was investigated and showed that Stokes drag is relevant for inclusions in aluminum melts. The settling of particles is analytically and experimentally investigated in this study by using a shape factor “K” based on Stokes law and online particle tracking by LiMCA (Liquid Metal Cleanliness Analyzer), respectively. The effect of the shape factor on settling velocities was observed clearly and the measured data show considerably slower settling than traditional models, indicating the effect of melt flow due to thermal convection.

show abstract

Section: Modeling Results Based On Limca Datamentioning

confidence: 99%

Section: A Characterization Of the Inclusions Present In A 998 Pct mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Shape Factor Effect on Inclusion Sedimentation in Aluminum Melts

Gökelma

Einarsrud

Tranell

et al. 2020

Metall Mater Trans B

Self Cite

View full text Add to dashboard Cite

show abstract

“…This result brings the question if the detectable size also might be influenced by the shape of the particles. However, the shape factor has also a direct influence on settling velocity of particles which can cause different problems during the detection [31] [32]. The shape of the particles could have been a reason for unpromising results but more research is needed in this topic.…”

Section: Settling Effect On Detectable Particle Size Rangementioning

confidence: 99%

“…Slower melt velocities such as in crucible or holding furnaces make the calibration of over counting particles easier. However, it has been reported by M. Badowski et al that the melt velocity can disturb the particle movement even in crucible furnaces [32]. But high turbulence such as in the case of launders can make the calibration more complicated but detection can be still performed.…”

Section: Melt Flow Effect On Detectionmentioning

confidence: 99%

A Review on Prerequisites of a Set-Up for Particle Detection by Ultrasonic Waves in Aluminium Melts

Gökelma¹,

Latacz²,

Friedrich³

2016

OJMetal

Self Cite

View full text Add to dashboard Cite

In many applications in aluminium industry, the number of inclusion-critical products increases and the quality of those products depend on the inclusion concentration and size. In order to improve the quality of aluminium products and the effectiveness of the processes, a reliable and cheaper on-line detection method is needed. Ultrasonic detection has been used in steel industry, but relatively rare in aluminium industry, although it would theoretically allow for an online non-intrusive detection of the cleanliness of the melt. In this work, the current information on ultrasonic inclusion detection was gathered and recommendations were provided on the Prerequisites for a setup for ultrasonic detection of non-metallic inclusions in aluminium as a contribution on previous works. It has been concluded that ultrasonic waves seem promising, and should be experimented more on an industrial level to have a clear view on the potentials of the method.

show abstract

Inclusion Detection in Molten Aluminum: Current Art and New Avenues for In Situ Analysis

Hudson

Apelian

2016

Inter Metalcast

View full text Add to dashboard Cite

Study of Particle Settling and Sedimentation in a Crucible Furnace

Cited by 4 publications

References 2 publications

Shape Factor Effect on Inclusion Sedimentation in Aluminum Melts

Shape Factor Effect on Inclusion Sedimentation in Aluminum Melts

A Review on Prerequisites of a Set-Up for Particle Detection by Ultrasonic Waves in Aluminium Melts

Inclusion Detection in Molten Aluminum: Current Art and New Avenues for In Situ Analysis

Contact Info

Product

Resources

About