scholarly journals Numerical Simulation of Multiphase Flow Behavior in Hot Metal Ladle Desulfurization with Bottom Powder Injection and Electric Field

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Lianghua Feng ◽  
Xiangwei Liao ◽  
Kun Liu ◽  
Wei Kang ◽  
Peng Han ◽  
...  
Keyword(s):  
Particle Concentration ◽  
Flow Behavior ◽  
Research Work ◽  
Powder Injection ◽  
Discrete Phase Model ◽  
Hot Metal ◽  
Stagnation Region ◽  
Concentration Difference ◽  
Injection Speed ◽  
Hot Metal Ladle

A computation fluid-coupled discrete phase model (CFD-DPM) was used to predict the motion characteristics of gas, particle, and liquid phases in the hot metal ladle. The influence of different voltage loading modes, voltage values, and powder injection speeds on the particle motion trail was investigated, while the effects on the particle concentration maximum difference in the stagnation region were discussed. The optimal injection and voltage parameters were proposed. The results are shown as follows: the loading voltage before injection is beneficial to the diffusion of particles in the molten pool. With the increase of voltage and injection speed, the distribution of particles in the upper part of the molten iron tends to be uniform. The bottom of the ladle is the stagnation region. Optimum voltage and injection speed were determined. Under the optimum conditions, particles are evenly dispersed and the particle concentration difference in the stagnation region is small. This research work will benefit greatly to the hot metal ladle desulfurization technology.

Exploration of new quality refractory to improve hot metal ladle refractory performance

2021 ◽  
Vol 125 ◽  
pp. 105384
Author(s):  
Moumita Nag ◽  
Biswanath Nag ◽  
Saumita Gangopadhyay ◽  
Prasanta Panigrahi ◽  
Brijender Singh
Keyword(s):  
Hot Metal ◽  
Hot Metal Ladle ◽  
Ladle Refractory

A Study on the Optimization of Solvent Debinding Process for Powder Injection Molded 316L Stainless Steel Parts

2016 ◽  
Vol 1133 ◽  
pp. 324-328 ◽  
Author(s):  
Muhammad Aslam ◽  
Faiz Ahmad ◽  
P.S.M. Bm-Yousoff ◽  
Khurram Altaf ◽  
Afian Omar ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
316L Stainless Steel ◽  
Research Work ◽  
Powder Injection ◽  
Blade Mixer ◽  
Injection Molded ◽  
Debinding Process ◽  
Scanning Electron

Optimization of solvent debinding process parameters for powder injection molded 316L stainless steel (SS) has been reported in this research work. Powder gas atomized (PGA) 316L SS was blended with a multicomponent binder in Z-blade mixer at 170°C ± 5°C for 90 minutes. Feedstock was successfully injected at temperature 170 ± 5°C. Injection molded samples were immersed in n-heptane for 2h, 4h, 6h and 8h at temperatures 50°C ,55°C and 60°C to extract the soluble binder components. Scanning electron microscope (SEM) results attested that soluble binder components were completely extracted from injection molded samples at temperature 55°C after 6h.

The physicochemical and DNA binding studies of some medicinal compounds in solutions

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Abbas Khan ◽  
Naila ◽  
Muhammad Humayun ◽  
Muhammad Sufaid Khan ◽  
Luqman Ali Shah ◽  
...  
Keyword(s):  
Flow Behavior ◽  
Aqueous Media ◽  
Research Work ◽  
Binding Constants ◽  
Physicochemical Study ◽  
Solution Temperature ◽  
Binding Studies ◽  
Experimental Conditions ◽  
Medicinal Compounds ◽  
Association Behavior

Abstract To understand the expected mode of action, the physicochemical study on the solution properties of medicinal compounds and their interaction with deoxyribonucleic acid (DNA), under varying experimental conditions, is of prime importance. The present research work illustrates the physicochemical study and interaction of certain medicinal compounds such as; Levofloxacin, Ciprofloxacin, and Ibuprofen with DNA. Density, viscosity and surface tension measurements have been performed in order to determine, in a systematic manner, the physicochemical, volumetric and thermodynamic properties of these compounds; and most of these parameters have shown different behavior with varying concentration of solution, temperature of the medium and chemical nature/structure of the compound. In addition, these drugs showed a spontaneous surface-active and association behavior in aqueous solutions. The flow behavior, surface properties, volumetric behavior and solute–solvent interaction of these drugs were prominently influenced by experimental variables and addition of DNA to their solutions. UV–Visible spectroscopy was also used to examine the interaction of these drugs with DNA in aqueous media in detail. Calculated values of binding constants (Kb) for all complexes of drug-DNA are positive, indicating a fruitful binding process. It is seen that a smaller Kb value reflects weaker binding of the drug with DNA and vise versa. Due to the difference in the chemical structure of drugs the values of binding constant are different for various drug-DNA complexes and follow the order Kb(Levofloxacin-DNA) > Kb(Ciprofloxacin-DNA) > Kb(Ibuprofen-DNA). On the basis of spectral changes and Kb it can be said that the binding of all these drugs with DNA may be of physicochemical nature and the dominating binding force be of hydrogen bonding between oxygen of drugs and hydrogen of DNA units and the drug having more oxygen atoms showed stronger binding ability. The data further suggest a limited possibility of chemical type attachment of these drugs with DNA.

A Study on the Convective Mass Transfer of Nitrogen to Water for a Gas Pressurizing System

2008 ◽  
Author(s):  
Kyoungwoo Seo ◽  
Young-In Kim ◽  
Jae-Kwang Seo ◽  
Doo-Jeong Lee
Keyword(s):  
Mass Transfer ◽  
Boundary Condition ◽  
Natural Convection ◽  
Research Work ◽  
Ideal Gas ◽  
Convective Mass Transfer ◽  
Field Function ◽  
Concentration Difference ◽  
Fluent Simulation ◽  
Fluent 6.3

Mass transfer due to a concentration difference of nitrogen can occur in a nuclear system. Our research work seeks to analyze and understand the mass transfer phenomena of nitrogen in water under the condition of a natural convection using the commercially available CFD computer model, FLUENT 6.3. The maximum solubility was employed to express the boundary condition at an interface between the nitrogen and water. First, the case that nitrogen was transferred to water by only a diffusion was simulated to verify the application of the UDS (User defined scalar) model in FLUENT 6.3 for a mass transfer. Diffusion equation, which was described as a PDE (Partial Differential Equation) with non-homogeneous boundary conditions, was solved and the solved results of the PDE showed a good agreement with those of the FLUENT simulation in the same condition. The same cylinder geometry with that of the diffusion case was used to estimate the convective mass transfer. By the natural convection caused by the thermal boundary condition, the mass transfer of nitrogen had a convection effect. The result of FLUENT 6.3 to compute the convective mass transfer showed that the nitrogen was transferred simultaneously in the entire region by the convection effect and it took about several hours until the mole fraction of nitrogen in the water side reached 50% of the maximum saturated value. The averaged mass transfer coefficient was calculated and compared with the results obtained from the heat and mass transfer analogy. The calculated coefficients showed the lower value than those obtained from the various correlations. When the steam mass transfer toward the gas side was negligible, the pressure drop of the gas side due to the reduced nitrogen caused by a mass transfer was computed using the ideal gas law and the Custom Field Function model in the FLUENT 6.3.

scholarly journals New Feedstock System for Fused Filament Fabrication of Sintered Alumina Parts

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4461 ◽  
Author(s):  
Dorit Nötzel ◽  
Thomas Hanemann
Keyword(s):  
Injection Molding ◽  
Material Selection ◽  
Flow Behavior ◽  
Ceramic Materials ◽  
Maximum Temperature ◽  
Powder Injection ◽  
Fused Filament Fabrication ◽  
Sintered Ceramic ◽  
Whole Process ◽  
Dependent Flow

Only a few 3D-printing techniques are able to process ceramic materials and exploit successfully the capabilities of additive manufacturing of sintered ceramic parts. In this work, a new two component binder system, consisting of polyethyleneglycol and polyvinylbutyral, as well stearic acid as surfactant, was filled with submicron sized alumina up to 55 vol.% and used in fused filament fabrication (FFF) for the first time. The whole process chain, as established in powder injection molding of ceramic parts, starting with material selection, compounding, measurement of shear rate and temperature dependent flow behavior, filament fabrication, as well as FFF printing. A combination of solvent pre-debinding with thermal debinding and sintering at a reduced maximum temperature due to the submicron sized alumina and the related enhanced sinter activity, enabled the realization of alumina parts with complex shape and sinter densities around 98 % Th. Finally the overall shrinkage of the printed parts were compared with similar ones obtained by micro ceramic injection molding.

Modeling of the Off-Axis High Power Diode Laser (HPDL) Cladding Process

2009 ◽  
Author(s):  
Shaoyi Wen ◽  
Yung C. Shin
Keyword(s):  
Diode Laser ◽  
High Power ◽  
Molten Pool ◽  
Flow Behavior ◽  
Temperature Fields ◽  
Powder Flow ◽  
Powder Injection ◽  
Rectangular Beam ◽  
Power Diode ◽  
High Power Diode Laser

Off-axis high power diode laser (HPDL) cladding is commonly used for surface quality enhancement such as coating, part repairing, etc. Although some laser cladding models are available in the literature, little has been reported on modeling of powder flow and molten pool for a rectangular beam with side powder injection. In this article, a custom-designed flat nozzle delivers the powder material into a distinct molten pool formed by a high power diode laser (HPDL) with a rectangular beam. A powder model is first presented to reveal the powder flow behavior below the flat nozzle. Key parameters such as the nozzle inclination angle, the rectangular beam profile, shielding gas flow rates and powder feed rate are incorporated so that spatial powder density, powder velocity and temperature distribution are distinctly investigated. Then in order to describe thermal and fluidic behavior around the molten pool formed by the rectangular beam, a three dimensional self-consistent cladding model is developed with the incorporation of the distributed powder properties as input. The level set method is adopted to track the complex free surface evolution. Temperature fields and fluid motion in the molten pool area resulting from the profile of rectangular beam are distinctly revealed. The effect of continuous mass addition is also embedded into the governing equations, making the model more accurate. A HPDL cladding with little dilution is formed and the simulated result agrees well with the experiment.

Finite Element Analysis of 100 t Hot Metal Ladle in Process of Tipping

2010 ◽  
Vol 17 (11) ◽  
pp. 19-23 ◽  
Author(s):  
Hong-yu Tian ◽  
Fu-rong Chen ◽  
Rui-jun Xie ◽  
Shi-hui Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Hot Metal ◽  
Element Analysis ◽  
Hot Metal Ladle

Influence of clogging of a T-shaped desulfurization lance on the flow field in a hot metal ladle

2019 ◽  
Vol 116 (3) ◽  
pp. 301 ◽  
Author(s):  
Wenjun Ma ◽  
Haibo Li ◽  
Jun Zhang ◽  
Yang Cui ◽  
Liang Sun
Keyword(s):  
Flow Field ◽  
Dead Zone ◽  
Injection Pressure ◽  
Hole Injection ◽  
Hot Metal ◽  
Injection Hole ◽  
Industrial Experiments ◽  
The Difference ◽  
Active Flow ◽  
Hot Metal Ladle

Lance injected desulphurization become ineffective when injection ports become obstructed. In this work, the difference of the flow fields between single and double hole injection was investigated by numerical simulations. When one of the openings in a T-shaped injection lance is blocked, a dead zone occurs in the ladle over approximately 1/4th of the volume, and there is not an active flow field on the surface of clogging side. To decrease clogging, industrial experiments examining different diameter lances were carried out. The results showed that clogging can be reduced by increasing the injection pressure and optimizing the injection hole diameter to be approximately 10 times the particle size of desulphurizer.

Sign in / Sign up

Export Citation Format

Share Document