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Slag Splashing in a Basic Oxygen Furnace under Different Blowing Conditions

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Open Journal of Applied Sciences 2015年第12期5卷 819-825页

作者： Miguel A. barron Isaias Hilerio Dulce Y. Medina Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Mexico D.F. Mexico

The influence of three different blowing conditions on the slag splashing process in a basic oxygen furnace for steelmaking is analyzed here using two-dimensional transient Computational Fluid Dynamics simulations. Four blowing conditions are considered in the computer runs: top blowing, combined blowing using just a bottom centered nozzle, combined blowing using two bottom lateral nozzles, and full combined blowing using the three top and the three bottom nozzles. Computer simulations show that full combined blowing provides greater slag splashing than conventional top blowing.

关键词： Basic Oxygen Furnace Bottom Blowing Combined Blowing Computational Fluid Dynamics Oxygen Steelmaking refractory Lining Slag Splashing Top Blowing

Non-Darcy Flow in Molding Sands

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Open Journal of Applied Sciences 2024年第4期14卷 976-982页

作者： Miguel A. barron-Meza Joan reyes-Miranda Daniel Flores-Sanchez Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Ciudad de Mexico Mexico

Darcy’s law is widely used to describe the flow in porous media in which there is a linear relationship between fluid velocity and pressure gradient. However, it has been found that for high numbers of reynolds this law ceases to be valid. In this work, the Ergun equation is employed to consider the non-linearity of air velocity with the pressure gradient in casting sands. The contribution of non-linearity to the total flow in terms of a variable defined as a non-Darcy flow fraction is numerically quantified. In addition, the influence of the shape factor of the sand grains on the non-linear flow fraction is analyzed. It is found that for values of the reynolds number less or equal than 1, the contribution of non-linearity for spherical particles is around 1.15%.

关键词： Darcy’s Law Molding Sands Non-Darcy Flow reynolds Number Shape Factor

Modeling and Simulation of Hot Metal Desulfurization by Powder Injection

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Open Journal of Applied Sciences 2015年第6期5卷 295-303页

作者： Miguel A. barron Isaias Hilerio Dulce Y. Medina Departmento de Materiales Universidad Autonoma Metropolitana Azcapozalco Mexico City Mexico

The desulfurization of hot metal by the mono-injection of lime powder and the co-injection of lime, calcium carbide and magnesium powders is mathematically modeled. The mono-injection model is derived from the continuity equation and is validated using experimental results and data previously reported in the literature. The co-injection model and the rate constant of the injected mixture are determined from the molar fractions and rate constants of the individual powders. The effect of the lime content of the mixture on the desulfurization dynamics is studied and discussed.

关键词： CFD Simulation Co-Injection Desulfurization Hot Metal Desulfurization Lime Injection Powder Mono-Injection Powder Desulfurization

Nitrogen Injection in Molten Aluminum in a Tank Degasser

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World Journal of Engineering and Technology 2018年第4期6卷 685-695页

作者： Luis A. Maldonado Miguel A. barron Dulce Y. Miranda Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Ciudad de Mexico Mexico

The injection of nitrogen in molten aluminum through a static impeller in a tank degassing unit is studied. Using basic principles of fluid mechanics, it is analyzed the influence of the nozzle diameter on the bubble diameter and the mean residence time of the bubbles in the molten aluminum. By means of transient isothermal 2D Computational Fluid Dynamics (CFD) simulations, the influence of the nitrogen volumetric flow rate on the phase distributions and the tank degasser dynamics is studied. Finally, an adiabatic CFD simulation is carried out in order to elucidate the changes in the molten aluminum temperature due to the injection of nitrogen at ambient temperature. This simulation shows that molten aluminum does not suffer drastic temperature reductions given that, in spite?that?the nitrogen is fed at ambient temperature, the mass of nitrogen is relatively small compared with the mass of aluminum.

关键词： Aluminum Degassing Bubble Diameter CFD Simulations Molten Aluminum Nitrogen Injection residence Time Tank Degasser

Numerical and Physical Modeling of Turbulence in a Peirce-Smith Copper Converter

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材料科学与工程（中英文A版） 2013年第7期3卷 510-518页

作者： Aaron Almaraz Cesar Lopez Miguel Angel barron Meza Gabriel Plascencia Technological research and Innovation Center 1PN Cerrada CECATI s/n Col. Sta. Catarina Mexico D.F. 02250 Mexico Materials Department Azcapotzalco Metropolitan Autonomous University Av. San Pablo 180 Azcapotzalco D.F. 02200 Mexico

Parallel mrNA, proteomics and mirNA expression analysis in cell line models of the intestine

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World Journal of Gastroenterology 2017年第41期23卷 7369-7386页

作者： Finbarr O’Sullivan Joanne Keenan Sinead Aherne Fiona O’Neill Colin Clarke Michael Henry Paula Meleady Laura Breen Niall barron Martin Clynes Karina Horgan Padraig Doolan richard Murphy National Institute for Cellular Biotechnology Dublin City University National Institute for Bioprocessing research & Training Alltech Dunboyne

AIM To identify mi rNA-regulated proteins differentially expressed between Caco2 and HT-29: two principal cell line models of the *** Exponentially growing Caco-2 and HT-29 cells were harvested and prepared for m rNA, mi rNA and proteomic profiling. m rNA microarray profiling analysis was carried out using the Affymetrix Gene Chip Human Gene 1.0 ST array. mi rNA microarray profiling analysis was carried out using the Affymetrix Genechip mi rNA 3.0 array. Quantitative Label-free LC-MS/MS proteomic analysis was performed using a Dionex Ultimate 3000 rSLCnano system coupled to a hybrid linear iontrap/Orbitrap mass spectrometer. Peptide identities were validated in Proteome Discoverer 2.1 and were subsequently imported into Progenesis QI software for further analysis. Hierarchical cluster analysis for all three parallel datasets(mi rNA, proteomics, m rNA) was conducted in the r software environment using the Euclidean distance measure and Ward's clustering algorithm. The prediction of mi rNA and oppositely correlated protein/m rNA interactions was performed using Target Scan 6.1. GO biological process, molecular function and cellular component enrichment analysis was carried out for the DE mi rNA, protein and m rNA lists via the Pathway Studio 11.3 Web interface using their Mammalian *** Differential expression(DE) profiling comparing the intestinal cell lines HT-29 and Caco-2 identified 1795 Genes, 168 Proteins and 160 mi rNAs as DE between the two cell lines. At the gene level, 1084 genes were upregulated and 711 were downregulated in the Caco-2 cell line relative to the HT-29 cell line. At the protein level, 57 proteins were found to be upregulated and 111 downregulated in the Caco-2 cell line relative to the HT-29 cell line. Finally, at the mi rNAs level, 104 were upregulated and 56 downregulated in the Caco-2 cell line relative to the HT-29 cell line. Gene ontology(GO) analysis of the DE m rNA identified cell adhesion, migration and ECM o

关键词： Caco-2 HT-29 Microarray Proteomics mirNA Targetscan Gene ontology

Clinical, cellular, microscopic, and ultrastructural studies of a case of fibrogenesis imperfecta ossium

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Bone research 2017年第2期5卷 123-136页

作者： Melissa L barron Mark S rybchyn Sutharshani ramesh rebecca S Mason S Fiona Bonar Paul Stalley Sundeep Khosla Bernie Hudson Christopher Arthur Edward Kim roderick J Clifton-Bligh Phillip B Clifton-Bligh Department of Physiology School of Medical Sciences Bosch Institute University of Sydney Sydney 2006 New South Wales Australia Douglas HanlyMoir Pathology Macquarie Park 2113 New South Wales Australia Department of Orthopaedics Royal Prince Alfred HospitalCamperdown 2050 New South Wales Australia Department of Endocrinology Mayo Clinic Rochester 55905 MN USA Department of Microbiology Royal North Shore Hospital St Leonards 2065 New South Wales Australia Department ofMicrobiology Royal North Shore Hospital St Leonards 2065 New South Wales Australia Department of Haematology Royal North Shore Hospital St Leonards 2065 New South Wales Australia Department of Endocrinology Royal North Shore Hospital St Leonards 2065 New SouthWales Australia and Faculty of Medicine University of Sydney Sydney 2006 New South Wales Australia

Fibrogenesis imperfecta ossium is a rare disorder of bone usually characterized by marked osteopenia and associated with variable osteoporosis and osteosclerosis, changing over time. Histological examination shows that newly formed collagen is abnormal, lacking birefringence when examined by polarized light. The case presented demonstrates these features and, in addition, a previously undocumented finding of a persistent marked reduction of the serum C3 and C4. Osteoblasts established in culture from a bone biopsy showed abnormal morphology on electron microscopy and increased proliferation when cultured with benzoylbenzoyl-ATP and 1,25-dihydroxyvitamin D, contrasting with findings in normal osteoblasts in culture. A gene microarray study showed marked upregulation of the messenger rNA(mrNA) for G-protein-coupled receptor 128(GPr 128), an orphan receptor of unknown function and also of osteoprotegerin in the patient's osteoblasts in culture. When normal osteoblasts were cultured with the patient's serum, there was marked upregulation of the mrNA for aquaporin 1. A single pathogenetic factor to account for the features of this disorder has not been defined, but the unique findings described here may facilitate more definitive investigation of the abnormal bone cell function.

关键词： ultrastructural cellular Clinical

CFD Analysis of Influence of Slag Viscosity on the Splashing Process in an Oxygen Steelmaking Converter

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Modeling and Numerical Simulation of Material Science 2013年第3期3卷 90-93页

作者： Miguel A. barron Dulce Y. Medina Isaias Hilerio Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco M&eacutexico D.F. M&eacutexico

Physical properties of molten slag such as viscosity, density and surface tension have a significant influence on the slag splashing process in an oxygen steelmaking converter. Particularly, viscosity determines the shear forces that rule droplets formation. Besides, stirring of the molten slag bath strongly depends on this property. In this work, the influence of viscosity on the efficiency of slag splashing is explored by means of transient Computational Fluid Dynamics simulations. Several values of viscosity are employed in the computer experiments. In order to quantify the splashing efficiency as function of slag viscosity, an average slag fraction on the converter walls is defined and calculated. CFD results are compared with those of an empirical expression, and at least qualitative agreement is found.

关键词： CFD Oxygen Steelmaking refractory Lining Slag Viscosity Splashing Process

Numerical Study of Solid Iron Carburization in a Carbon Monoxide Atmosphere

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材料科学与工程（中英文B版） 2013年第9期3卷 582-585页

作者： Miguel Angel barron Meza G. Plascencia Aaron Almaraz Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Av. San Pablo 180 Col. Reynosa-TamaulipasMexico D.F. 02200 Mexico CIITEC-IPN Cerrada Cecati s/n Col. Sta. Catarina Mexico D.F. 02250 Mexico