Investigation of melt stirring in aluminum melting furnace through Water model

Yamamoto, Takuya; Kato, Kazumichi; Komarov, Sergey V.; Ueno, Yasunori; Hayashi, Masaaki; Ishiwata, Yasuo

doi:10.1016/j.jmatprotec.2018.04.025

Cited by 21 publications

(7 citation statements)

References 15 publications

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“…The validation and verification of the present simulation model have been described in details in our previous study. 18) The total number of numerical grid cells was approximately 1,250,000. The residual errors for each algebraic matrix were Figure 3 shows the time variation of non-dimensional concentration at point A.…”

Section: Numerical Proceduresmentioning

confidence: 99%

Evaluation of Mass Transfer in an Aluminum Melting Furnace Stirred Mechanically during Flux Treatment

et al. 2019

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The main purpose of the present study is to evaluate mass transfer in an aluminum melting furnace stirred mechanically during flux treatment through water model experiment. Instead of the flux particles, model perlite particles were utilized, and the mass transfer between the pre-coated model particles and water bath was evaluated. Numerical simulation was also carried out to understand the flow pattern and mass transfer mechanisms. The fast impeller rotation speed enhanced the mass transfer. Besides, counter clockwise (CCW) rotation of impeller yielded larger mass transfer as compared to that of the clockwise impeller rotation (CW). The area of higher kinetic energy expanded with increase of impeller rotation speed, and the turbulent energy for the case of CCW rotation was higher compared to the CW case. The mechanism of the mass transfer enhancement under the CCW rotation conditions can be understood in terms of the turbulent energy at the free surface. The averaged downward flow was insufficient to cause the particle entrainment. On the other hand, the turbulent fluctuations were strong enough to cause the particle entrainment.

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Section: Numerical Proceduresmentioning

confidence: 99%

Evaluation of Mass Transfer in an Aluminum Melting Furnace Stirred Mechanically during Flux Treatment

et al. 2019

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“…The main process parameters influencing its efficiency are the rotor speed and the inert gas flow rate [ 22 , 23 , 24 ]. These parameters directly affect the mechanism of gas dispersion in the volume of the refined metal bath and the nature of the movement of the liquid metal in the refining vessel [ 25 , 26 ]. For refining reactors with a rotor, Oldshue [ 27 ] described four degrees of gas-bubble scattering in liquid metal: column flow, or the formation of geysers on the surface of the liquid; minimum dispersion; fine dispersion and uniform dispersion.…”

Section: Introductionmentioning

confidence: 99%

Using Physical Modeling to Optimize the Aluminium Refining Process

et al. 2022

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Concern for the environment and rational management of resources requires the development of recoverable methods of obtaining metallic materials. This also applies to the production of aluminium and its alloys. The quality requirements of the market drive aluminium producers to use effective refining methods, and one of the most commonly used is blowing an inert gas into liquid aluminium via a rotating impeller. The efficiency and cost of this treatment depends largely on the application of the correct ratios between the basic parameters of the process, which are the flow rate of the inert gas, the speed of the rotor and the duration of the process. Determining these ratios in production conditions is expensive and difficult. This article presents the results of research aimed at determining the optimal ratio of the inert gas flow rate to the rotary impeller speed, using physical modeling techniques for the rotor as used in industrial conditions. The tests were carried out for rotary impeller speeds from 150 to 550 rpm and gas flow rates of 12, 17 and 22 dm3/min. The research was carried out on a 1:1 scale physical model, and the results, in the form of visualization of the degree of gas-bubble dispersion, were assessed on the basis of the five typical dispersion patterns. The removal of oxygen from water was carried out analogously to the process of removing hydrogen from aluminium. The curves of the rate of oxygen removal from the model liquid were determined, showing the course of oxygen reduction during refining with the same inert gas flows and rotor speeds mentioned above.

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“…Physical modeling of the technology process in water was conducted to visualize the effect of high shear degassing parameters (rotor speed and gas flow) on the dispersion and distribution of the inert gas bubbles in the liquid [24,28]. Water shares a similar fluid dynamic behavior (viscosity to density ratio) with molten aluminum, and, therefore, it is an excellent liquid to replicate bubble dispersion and degassing performance in molten aluminum [29,30]. Examples of these visualizations are shown in Figure 2, for the HSMC 90 mm unit compared to the FOSECO 90 mm rotary degasser available in our laboratory (Foseco, Tamworth, UK), and in Figure 3, for the HSMC 42 mm unit evaluation and process optimization.…”

Section: Hsmc Process Visualization and Optimization By Water Modelingmentioning

confidence: 99%

Degassing of Aluminum Alloy Melts by High Shear Melt Conditioning Technology: An Overview

Lazaro-Nebreda

Patel

Lordan

et al. 2022

Metals

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The search for more efficient methods for degassing aluminum alloy melts has always been of great interest for the metal industry because the presence of hydrogen and oxides in the melts’ prior casting was detrimental to the integrity and properties of the final products. In this work, we present an overview of the progress and key findings from the research and development of an innovative High Shear Melt Conditioning (HSMC) degassing technology during the Liquid Metal Engineering (LiME) Research Hub project. Compared to conventional rotary degassing, this novel technique was capable of working at higher rotor speeds to efficiently break and disperse the naturally occurring oxide bifilms in the melt and to capture and disperse each supplied inert gas bubble into many tiny bubbles throughout the whole melt. This resulted in the elimination of the need to degas fluxes to remove the oxides in the melt, the reduction in the gas flow required to reach the same level of hydrogen removal rate, and the minimization of the regassing effect after processing. The increased process efficiency allowed for reduced melt processing costs and, at the same time, improved the melt quality, which resulted in fewer defects and improved mechanical properties.

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Investigation of melt stirring in aluminum melting furnace through Water model

Cited by 21 publications

References 15 publications

Evaluation of Mass Transfer in an Aluminum Melting Furnace Stirred Mechanically during Flux Treatment

Evaluation of Mass Transfer in an Aluminum Melting Furnace Stirred Mechanically during Flux Treatment

Using Physical Modeling to Optimize the Aluminium Refining Process

Degassing of Aluminum Alloy Melts by High Shear Melt Conditioning Technology: An Overview

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