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Singh U.,TCS Innovation Labs TRDDC | Anapagaddi R.,Grace Davison Chemical India Pvt. Ltd. | Mangal S.,TCS Innovation Labs TRDDC | Padmanabhan K.A.,University of Hyderabad | Singh A.K.,Indian Institute of Technology Kanpur
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2016

Ladle furnace is a key unit in which various phenomena such as deoxidation, desulfurization, inclusion removal, and homogenization of alloy composition and temperature take place. Therefore, the processes present in the ladle play an important role in determining the quality of steel. Prediction of flow behavior of the phases present in the ladle furnace is needed to understand the phenomena that take place there and accordingly control the process parameters. In this study, first a mathematical model is developed to analyze the transient three-phase flow present. Argon gas bottom-stirred ladle with off-centered plugs has been used in this study. Volume of fluid method is used in a computational fluid dynamics (CFD) model to capture the behavior of slag, steel, and argon interfaces. The results are validated with data from literature. Eye opening and slag–steel interfacial area are calculated for different operating conditions and are compared with experimental and simulated results cited in literature. Desulfurization rate is then predicted using chemical kinetic equations, interfacial area, calculated from CFD model, and thermodynamic data, obtained from the Thermo-Calc software. Using the model, it is demonstrated that the double plug purging is more suitable than the single plug purging for the same level of total flow. The advantage is more distinct at higher flow rates as it leads higher interfacial area, needed for desulfurization and smaller eye openings (lower oxygen/nitrogen pickup). © 2016, The Minerals, Metals & Materials Society and ASM International. Source

Thaskani S.,TCS Innovation Labs TRDDC | Karande S.,TCS Innovation Labs TRDDC | Lodha S.,TCS Innovation Labs TRDDC
Proceedings - International Conference on Image Processing, ICIP | Year: 2015

This paper proposes a patch based image inpainting algorithm for multi-view images. In our framework we fill the holes which are created by removing objects from an image pair. We assume that a user provides two masks to remove objects from an image pair. Our algorithm consists of two stages. In the first stage we align the images and construct an exemplar dictionary with the patches sampled from the reference as well as the warped image. In the second stage, the reference image is iteratively filled by choosing patches along the boundary of the hole. We use l1-minimization framework to estimate the unknown pixels. This proposed method is observed to outperform existing techniques that are built upon exemplar based sparse reconstruction. © 2015 IEEE. Source

Malhotra C.,TCS Innovation Labs TRDDC | Patil R.,TCS Innovation Labs TRDDC | Kausley S.,TCS Innovation Labs TRDDC | Ahmad D.,TCS Innovation Labs TRDDC
AIP Conference Proceedings | Year: 2013

Rice-husk-ash is used as the base material for developing novel compositions to deal with the challenge of purifying drinking water in low-income households in India. For example, rice-husk-ash cast in a matrix of cement and pebbles can be formed into a filtration bed which can trap up to 95% of turbidity and bacteria present in water. This innovation was proliferated in villages across India as a do-it-yourself rural water filter. Another innovation involves embedding silver nanoparticles within the rice husk ash matrix to create a bactericidal filtration bed which has now been commercialized in India as a low-cost for-profit household water purifier. Other innovations include the impregnation of rice-husk-ash with iron hydroxide for the removal of arsenic from water and the impregnation of rice-husk ash with aluminum hydroxide for the removal of fluoride ions from water which together have the potential to benefit over 100 million people across India who are suffering from the health effects of drinking groundwater contaminated with arsenic and fluoride. © 2013 AIP Publishing LLC. Source

Patil R.A.,TCS Innovation Labs TRDDC | Ahmad D.,TCS Innovation Labs TRDDC | Kausley S.B.,TCS Innovation Labs TRDDC | Balkunde P.L.,TCS Innovation Labs TRDDC | Malhotra C.P.,TCS Innovation Labs TRDDC
Journal of Water and Health | Year: 2015

Simple, low-cost household interventions are known to be effective in lowering the incidence of waterborne diseases in developing countries. However, high costs along with operational and maintenance issues have prevented the successful adoption of these interventions among the affected communities. To address these limitations, a cost-effective, gravity-driven water purification cartridge has been developed by employing the synergistic disinfection action of low concentrations of silver and chlorine on bacteria and viruses. The silver and chlorine treatment components within the cartridge have been developed using inexpensive materials and integrated with a life indicator and auto-shut-off-mechanism within a compact form factor. The antibacterial as well as antiviral performance of the cartridge was tested by using ground water spiked with Escherichia coli and MS2 bacteriophage. The results show that, although individually, the silver and chlorine treatment systems were unable to inactivate the test strains, the integrated cartridge inactivates both bacteria as well as viruses up to the log reduction requirement of the USEPA guide standard for microbiological water purifiers over its designated life of 2,000 liters. © IWA Publishing 2015. Source

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