Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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Subject: search.filters.subject.Mixing efficiency

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  • Conference Object
    Numerical Study on the Mixing Characteristics in the Argon Oxygen Decarburization Process
    (Association for Iron and Steel Technology, AISTECH, 2022) Cheng, Zhongfu; Wang, Yannan; Dutta, Abhishek; Blanpain, Bart; Guo, Muxing; Malfliet, Annelies
    The argon-oxygen decarburization (AOD) process is a crucial refining method in modern stainless steel production. It has been widely used to remove C in the past few decades [1, 2]. The AOD converter can provide excellent mixing conditions through turbulent stirring using submerged tuyeres. In the AOD process, the flow characteristics in the bath have a significant influence on the mass transport, momentum exchange and heat transfer, which are closely linked with the gas-metal reaction kinetics and the refining efficiency. A deep understanding of jet behavior, bubble flow characteristics and mixing efficiency facilitates further optimization of the decarburization and desulfurization operations. This will increase the AOD productivity and lower its energy and material consumption as well as the manufacturing cost.
  • Article
    Citation - WoS: 4
    Citation - Scopus: 5
    Numerical Study of Fluid Flow and Mixing in the Argon Oxygen Decarburization (aod) Process
    (Iron and Steel Institute of Japan, 2023) Cheng, Zhongfu; Wang, Yannan; Dutta, Abhishek; Blanpain, Bart; Guo, Muxing; Malfliet, Annelies
    A three-dimensional (3D) model has been developed based on the Eulerian multiphase flow approach to investigate the fluid flow behavior and mixing efficiency in the multi-tuyere AOD process. The interphase forces, including drag force, lift force, virtual force, turbulent dispersion force, and wall lubrication force, were incorporated into this model. The model was used to simulate six-tuyere and seven-tuyere AOD processes. The phenomena of multi-jet penetration, bubble plume merging, 3D turbulent flow and mixing characteristics were considered. The results indicate that the bubble plume merging occurs in the upper part of the liquid bath, forming a typical plume cluster. The predicted penetration length for a single tuyere jet agrees well with the previous work. For the multi-jet system, the side jets penetrate deeper than the inside ones. The six-tuyere AOD has a good flow condition in the center of the liquid bath, while the seven-tuyere AOD has a better flow pattern in the sidewall region and the lower bath. Overall, the seven-tuyere AOD performs better in mixing efficiency than the six-tuyere AOD under the same gas flow rate. These findings increase the understanding of the AOD process, allowing further optimization of process parameters. This model can be further extended to incorporate the thermochemical reactions into the modeling of the AOD reactor.
  • Article
    Citation - WoS: 23
    Citation - Scopus: 24
    Constructal Branched Micromixers With Enhanced Mixing Efficiency: Slender Design, Sphere Mixing Chamber and Obstacles
    (Elsevier Ltd., 2019) Çetkin, Erdal; Miguel, Antonio F.
    Here we uncover the passive micromixer designs with the maximum mixing efficiency under a lesser flow impedance. Three different designs of micromixers were considered for volume constrained systems: branched systems of ducts, branching ducts with sphere mixing chamber and branching ducts with obstacles. The best performing designs, with maximum mixing efficiency and minimum flow impedance, are uncovered numerically by considering three degrees of freedom (ratios between diameters, between lengths, and between length and diameter) under total volume constraint. The mixing efficiency, the flow impedance and the mixer performance (or mixer quality) for all the designs are determined based on numerical results. The results uncover that the branched micromixer should have long mother ducts with larger diameter than daughter ducts. Our results also show that branching ducts with sphere mixing chambers and obstacles also enhance the mixing efficiency but with an additional penalty on flow impedance. Besides, systems with a sphere mixing chamber insertion in the junction between mother and daughter ducts have greater mixing efficiency than systems with embedded obstacles into the mother channel. However, for a given flow impedance, the mixing efficiency is greater for branched systems of ducts than for branching ducts with sphere mixing chamber and with obstacles. For mixer systems built in a space with limited size, branching ducts with sphere mixing chamber may be a good option because they require less space than the other systems. Here new analytical models are also proposed to predict the mixing efficiency and mixer performance based on numerical results. In summary, this paper provides important insights for the designers of micromixer based on Constructal law. (C) 2018 Elsevier Ltd. All rights reserved.