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CFD Prediction of the Turbulent Flow Generated in Stirred Square Tank by a Rushton Turbine

Energy and Power Engineering 2014年第5期6卷 95-110页

作者： W. Chtourou M. Ammar z. driss M. S. Abid National School of Engineers of Sfax (ENIS) Department of Mechanical Engineering Laboratory of Electromechanical Systems (LASEM) Sfax Tunisia

The Computational Fluid Dynamics (CFD) have been used in the analysis and design of agitated vessel. Most of the researches done in this area are limited to the baffled or unbaffled stirred tank. In this paper, we have been interested in studying of the new design. Particularly, the flow and turbulence fields in square vessel stirred by a standard Rushton turbine have been simulated by means of CFD techniques. The Navier-Stokes equations governing the phenomenon of transfer of momentum are solved by a discretiz.tion method for finite volume. The MRF approaches can be used in simulation of the steady state problem. The numerical results from the application of CFD code Fluent with the stationary approach Multi Reference Frame (MRF) are presented in the planes containing the blade. The validation of CFD results with experimental measurements showed a good agreement.

关键词： CFD Mixing Turbulent Rushton Turbine Stirred Vessel

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Impact of Heat Treatments and Hole Density (p) on the Structural, Electrical, and Superconducting Properties of LnSrBaCu₃O_{6+z./sub> (Ln = Eu, Sm, Nd) Compounds}

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Communications and Network 2023年第4期15卷 83-97页

作者： Mohammed Bellioua Mohamed Id El Amel Fatima Bouz.t Mohamed Errai driss Soubane Aderrahim Ait Khlifa Mohammed Khenfouch Issam Mouhti Ahmed Tirbiyine Essediq Youssef El Yakoubi Abdelhakim Nafidi Laboratory of Materials Electrical Systems Energy and Environment Department of Applied Physics Faculty of Applied Sciences Ibnou Zohr University Agadir Morocco LAMISNE Laboratory Polydisciplinary Faculty of Taroudant Ibn Zohr University Agadir Morocco Department of Physics Polydisciplanry Faculty Safi Cadi Ayyad University Marrakech Morocco ALLS Laboratory at INRS-EMT Varennes Canada Laboratory of Condensed Matter Physics and Nanomaterials for Renewable Energy Faculty of Sciences Agadir Morocco

In this study, we thoroughly examined the impact of heat treatments and hole count (p) on the properties of LnSrBaCu3O6+z.(Ln = Eu, Sm, Nd) compounds. We focused on preparation, X-ray diffraction with Rietveld refinem... 详细信息

In this study, we thoroughly examined the impact of heat treatments and hole count (p) on the properties of LnSrBaCu3O6+z./sub> (Ln = Eu, Sm, Nd) compounds. We focused on preparation, X-ray diffraction with Rietveld refinement, AC susceptibility, DC resistivity measurements, and heat treatment effects. Two heat treatment types were applied: oxygen annealing [O] and argon annealing followed by oxygen annealing [AO]. As the rare earth Ln’s ionic radius increased, certain parameters notably changed. Specifically, c parameter, surface area S, and volume V increased, while critical temperature Tc and holes (p) in the CuO2 plane decreased. The evolution of these parameters with rare earth Ln’s ionic radius in [AO] heat treatment is linear. Regardless of the treatment, the structure is orthorhombic for Ln = Eu, tetragonal for Ln = Nd, orthorhombic for Ln = Sm [AO], and pseudo-tetragonal for Sm [O]. The highest critical temperature is reached with Ln = Eu (Tc [AO] = 87.1 K). Notably, for each sample, Tc [AO] surpasses Tc [O]. Observed data stems from factors including rare earth ionic siz., improved cationic and oxygen chain order, holes count p in Cu(2)O2 planes, and in-phase purity of [AO] samples. Our research strives to clearly demonstrate that the density of holes (p) within the copper plane stands as a determinant impacting the structural, electrical, and superconducting properties of these samples. Meanwhile, the other aforementioned parameters contribute to shaping this density (p).

关键词： High-Tc Superconductors Heat Treatments Hole Density (p) Tc Parameter c Surface ab Electrical Resistance X-Ray Diffraction

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Impact of Heat Treatments and Hole Density (p) on the Structural, Electrical, and Superconducting Properties of LnSrBaCu3O6+z.(Ln = Eu, Sm, Nd) Compounds

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Communications and Network（通讯与网络） 2023年第4期

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