Simulation of Bubble Behavior in a Water Physical Model of an Aluminum Degassing Ladle Unit Employing Compound Technique of Rotary Blowing and Ultrasonic

Gao, Guanjun; Wang, Ming; Shi, Daming; Kang, Yingfang

doi:10.1007/s11663-019-01607-y

Cited by 11 publications

(6 citation statements)

References 26 publications

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“…In contrast, larger bubbles can be observed in rotors B, C and E. Lower degassing efficiency was expected for these rotors given the larger bubbles and poorer distribution in the liquid volume. These findings are consistent with literature knowledge [15,20,21,36,41,43,46]. In Figure 5, it can be seen that the gas distribution in the liquid was similar for all rotors.…”

Section: Resultssupporting

confidence: 92%

“…The authors also confirmed that the gas flow has an impact on bubble size, which increases with increasing gas flow and decreasing rotor rotational speed [31,34,35]. Bubble dispersion as a function of rotor speed was explored in [36]. As found in that study, the bubble size increases with increasing rotational speed of the rotor.…”

Section: Introductionsupporting

confidence: 55%

“…The intensity of refining is also affected by rotor speed. With a constant flow of the gas and higher speed, the bubbles exhibit smaller dimensions compared to a situation with lower speed [36,40]. On the other hand, coalescence becomes easier with higher turbulence and the bubble dimensions increase again [36].…”

Section: Introductionmentioning

confidence: 98%

“…The fluid is pushed out of the rotor in the radial direction thanks to the momentum transmitted by the rotor and the flow of the gas. Two circulation loops thus form in the ladle-below and above the line of the rotor, while the upper circulation loop creates a weak flow, meaning that poor circulation is achieved in the upper part of the vessel [20,36]. "Dead volumes" thus form near the surface of the metal melt, which do not react with the injected gas [23].…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Degassing Efficiency on a Foundry Degassing Unit Using Different Rotor Types

Kolínský,

Prášil,

Socha

et al. 2024

Applied Sciences

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The present paper describes a comparison of the efficiency of different types of rotors used in the refining of aluminium melt at a foundry degassing unit (FDU). Physical modelling was used to obtain data for six different rotor types under defined experimental conditions. In order to evaluate the data from the physical model, an evaluation method based on the interpolation of degassing curves was developed in such a way that the resulting characteristic can be expressed by a single parameter. Using the new methodology, the datasets were replaced by a single dimensionless parameter, a, which characterizes the rotor performance at a given gas flow rate. Based on the comparison of these performance parameters, it was possible to mutually compare the rotor efficiency depending on the selected conditions. The comparison is also demonstrated on the expected degassing time to a certain required concentration. Based on the physical model results, the study found that rotor D had the highest degassing efficiency, followed by rotors F and A. Rotors B and E had similar efficiency at a flow rate of 17 Nl·min−1. However, rotor B showed better efficiency at higher inert gas flow rates (19 and 21 Nl·min−1), while rotor E showed better efficiency at lower flow rates (13 and 15 Nl·min−1).

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Section: Resultssupporting

confidence: 92%

Section: Introductionsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Comparison of Degassing Efficiency on a Foundry Degassing Unit Using Different Rotor Types

Kolínský,

Prášil,

Socha

et al. 2024

Applied Sciences

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“…It is possible to reduce the gas content in the melt by reducing its partial pressure in an inert gas bubble, according to the Sieverts Law. The main optimization parameters are the rotary impeller speed and the amount of blown inert gas [8][9][10]. The efficiency of this rotary refining depends on the creation of fine bubbles with a high interphase surface, wide-spread distribution, residence time of its effect in the melt, and mostly on the widespread dispersion of bubbles into the whole volume of the refining ladle.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Technological Parameters of Aluminium Melt Refining in the Ladle by Blowing of Inert Gas through the Rotating Impeller

Walek

Michalek

Tkadlečková

et al. 2021

Metals

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The presented paper deals with the use of physical modelling to study the degassing process of aluminium melts in the refining ladle by blowing inert gas through a rotating impeller. For the purposes of physical modelling, a plexiglass model in a scale of 1:1 is used for the operating ladle. Part of the physical model is a hollow shaft used for gas supply that is equipped with an impeller and two baffles. The degassing process of aluminium melt by blowing of inert gas is simulated at physical modelling by a decrease of dissolved oxygen in the model liquid (water). This paper is aimed at the evaluation of laboratory experiments that were obtained by the method of physical modelling. Attention is focused on the assessment of relevant parameters for the degassing process—rotary impeller speeds, volume flow rate of inert gas, the distance of the impeller from the bottom of the refining ladle, and impeller variant. The preliminary results of physical modelling show that the optimal results of the refining process are achieved by using the F2A 190 impeller.

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Numerical Simulation on the Multiphase Flow During the KR Process Using the Eulerian–Eulerian Modeling

Zhao

Chen

Zhang

2020

The Minerals, Metals &Amp; Materials Series

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Simulation of Bubble Behavior in a Water Physical Model of an Aluminum Degassing Ladle Unit Employing Compound Technique of Rotary Blowing and Ultrasonic

Cited by 11 publications

References 26 publications

Comparison of Degassing Efficiency on a Foundry Degassing Unit Using Different Rotor Types

Comparison of Degassing Efficiency on a Foundry Degassing Unit Using Different Rotor Types

Modelling of Technological Parameters of Aluminium Melt Refining in the Ladle by Blowing of Inert Gas through the Rotating Impeller

Numerical Simulation on the Multiphase Flow During the KR Process Using the Eulerian–Eulerian Modeling

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