Shetti Swamy | University of Hyderabad (original) (raw)
Papers by Shetti Swamy
Thermoelectric materials have drawn vast attentions for centuries, because thermoelectric effects... more Thermoelectric materials have drawn vast attentions for centuries, because thermoelectric effects enable direct conversion between thermal and electrical energy, thus providing an alternative for power generation and refrigeration. This review summaries the thermoelectric phenomena, applications and parameter relationships. The approaches used for thermoelectric performance enhancement are outlined, including: modifications of electronic band structures and band convergence to enhance Seebeck coefficients; nanostructuring and all-scale hierarchical architecturing to reduce the lattice thermal conductivity. Several promising thermoelectric materials with intrinsically low thermal conductivities are introduced. The low thermal conductivities may arise from large molecular weights, complex crystal structures, liquid like transports or high anharmonicity of chemical bonds. At the end, a discussion of future possible strategies is proposed, aiming at further thermoelectric performance enhancements.
Thesis Chapters by Shetti Swamy
Overlay process involves the application of a deposition on the surface of a metallic workpiece b... more Overlay process involves the application of a deposition on the surface of a metallic workpiece by
employing a welding method such as plasma transferred arc (PTA) and Tungsten inert gas
welding(TIG), and has found widespread application in the steel, power, mining and in the
petroleum industry. Stellite 6 has an outstanding resistance to seizing or galling as well as
cavitations erosion and is extensively used to combat galling in valve trims, pump sleeves and
liners. The base material used in this investigation was casting plate of duplex stainless steel of 50
& 12.5 mm thickness of grade UNS S32760 F55, which is widely used for the fabrication of valves,
valve cones, spindles, and pressure vessel parts. Experiments were carried out by using TIG and
PTA processes. After the experiments samples were prepared for macro, micro examinations,
hardness and impact tests. Volume fraction of ferrite phase in F55 steel evaluated.
Conference Presentations by Shetti Swamy
MINERAL PROCESSING TECHNOLOGY(MPT), 2017
Leaching is a common practice of hydro-metallurgical operations in mineral extraction. The Biolea... more Leaching is a common practice of hydro-metallurgical operations in mineral extraction. The
Bioleaching also called Bio-hydroleaching, have played greater role to recover of valuable metals from
various minerals of oxides and sulphide ores especially for low grade ores. An increase in research and
development for laboratory scale to large-scale industrial operations of Bioleaching finds attention in now
a day. Bioleaching is a simple and effective technology for metal extraction from low-grade ores and
mineral concentrates. With little complexity in attaining operational conditions of Bioleaching that are
distinct from the conventional practices of leaching of oxides or sulphide by either acid-base reactions or
redox chemical reactions. The kinetic mechanisms and feasibility for selective digestion of metals from
mineral ores can be discussed. Bacterial leaching type in an acid environment at pH values usually
between 1.5 and 3 at which most metal ions remain in solution. They are much cleaner than the traditional
and are used to recover metal like - copper, zinc, lead, nickel, gold, silver, cobalt, etc. Stirred tank
bioleaching has been commercialized for cobalt recovery and for bio-oxidation of refractory gold ores.
The microorganisms used in bioleaching type, like: Thiobacillus, Leptospirillum, Acidithiobacillus,
Thermophilic bacteria, Heterotrophic bacteria, Fungi, etc. The mechanism of bioleaching is done by
Direct and indirect bacterial leaching. Bioleaching has also some potential for metal recovery and
detoxification of industrial waste products, sewage sludge and soil contaminated with heavy metals.
In the present work, present trends in practices of Bioleaching and its advantages for recovery of metals
from mineral ores, industrial and sewage wastages will be discussed. The kinetic understanding of
selectivity cases with different bacterial and microorganisms will be discussed. Along with the feasibility
of adoption of such practice and conversion of laboratory investigations to industrial Leaching practices.
Thermoelectric materials have drawn vast attentions for centuries, because thermoelectric effects... more Thermoelectric materials have drawn vast attentions for centuries, because thermoelectric effects enable direct conversion between thermal and electrical energy, thus providing an alternative for power generation and refrigeration. This review summaries the thermoelectric phenomena, applications and parameter relationships. The approaches used for thermoelectric performance enhancement are outlined, including: modifications of electronic band structures and band convergence to enhance Seebeck coefficients; nanostructuring and all-scale hierarchical architecturing to reduce the lattice thermal conductivity. Several promising thermoelectric materials with intrinsically low thermal conductivities are introduced. The low thermal conductivities may arise from large molecular weights, complex crystal structures, liquid like transports or high anharmonicity of chemical bonds. At the end, a discussion of future possible strategies is proposed, aiming at further thermoelectric performance enhancements.
Overlay process involves the application of a deposition on the surface of a metallic workpiece b... more Overlay process involves the application of a deposition on the surface of a metallic workpiece by
employing a welding method such as plasma transferred arc (PTA) and Tungsten inert gas
welding(TIG), and has found widespread application in the steel, power, mining and in the
petroleum industry. Stellite 6 has an outstanding resistance to seizing or galling as well as
cavitations erosion and is extensively used to combat galling in valve trims, pump sleeves and
liners. The base material used in this investigation was casting plate of duplex stainless steel of 50
& 12.5 mm thickness of grade UNS S32760 F55, which is widely used for the fabrication of valves,
valve cones, spindles, and pressure vessel parts. Experiments were carried out by using TIG and
PTA processes. After the experiments samples were prepared for macro, micro examinations,
hardness and impact tests. Volume fraction of ferrite phase in F55 steel evaluated.
MINERAL PROCESSING TECHNOLOGY(MPT), 2017
Leaching is a common practice of hydro-metallurgical operations in mineral extraction. The Biolea... more Leaching is a common practice of hydro-metallurgical operations in mineral extraction. The
Bioleaching also called Bio-hydroleaching, have played greater role to recover of valuable metals from
various minerals of oxides and sulphide ores especially for low grade ores. An increase in research and
development for laboratory scale to large-scale industrial operations of Bioleaching finds attention in now
a day. Bioleaching is a simple and effective technology for metal extraction from low-grade ores and
mineral concentrates. With little complexity in attaining operational conditions of Bioleaching that are
distinct from the conventional practices of leaching of oxides or sulphide by either acid-base reactions or
redox chemical reactions. The kinetic mechanisms and feasibility for selective digestion of metals from
mineral ores can be discussed. Bacterial leaching type in an acid environment at pH values usually
between 1.5 and 3 at which most metal ions remain in solution. They are much cleaner than the traditional
and are used to recover metal like - copper, zinc, lead, nickel, gold, silver, cobalt, etc. Stirred tank
bioleaching has been commercialized for cobalt recovery and for bio-oxidation of refractory gold ores.
The microorganisms used in bioleaching type, like: Thiobacillus, Leptospirillum, Acidithiobacillus,
Thermophilic bacteria, Heterotrophic bacteria, Fungi, etc. The mechanism of bioleaching is done by
Direct and indirect bacterial leaching. Bioleaching has also some potential for metal recovery and
detoxification of industrial waste products, sewage sludge and soil contaminated with heavy metals.
In the present work, present trends in practices of Bioleaching and its advantages for recovery of metals
from mineral ores, industrial and sewage wastages will be discussed. The kinetic understanding of
selectivity cases with different bacterial and microorganisms will be discussed. Along with the feasibility
of adoption of such practice and conversion of laboratory investigations to industrial Leaching practices.