1. Faculty Publications
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Item Asbestos mining - campaign against its utilisation in western world(1989) Venkat Reddy D.[No abstract available]Item �ber den Einflu� von Schwefelwasserstoff auf die Korrosion des Eisens in sauren L�sungen(1979) Ramchandran, T.; Bohnenkamp, K.An Eisenelektroden wurden in anges�uerten Perchlorat und Sulfatl�sungen nach Einleiten von Schwefelwasserstoff erheblich ver�nderte Stromdichte?Potentialkurven beobachtet. Gegen�ber den reinen L�sungen ergeben sich mit Schwefelwasserstoff stark erh�hte anodische Stromdichten und bis um den Faktor 10 erh�hte Korrosionsgeschwindigkeiten. Dabei sind die anodischen Tafelgeraden log iA = f (E) mit H2S nur rund halb so steil wie ohne H2S. Wahrscheinlich wirken die SH??Ionen �hnlich wie die OH??Ionen als Katalysator der Eisenaufl�sung, sind aber bis fast zur S�ttigung absorbiert. Copyright � 1979 Verlag GmbH & Co. KGaA, WeinheimItem TWO-STAGE SEQUENTIALLY OPERATED REGENERATIVE CONVERTERS WITH CONTROLLED FLYWHEELING.(1985) Bhat, Subbanna, P.; Dubey, Gopal, K.Separately excited dc motors fed by sequentially operated multistage converters are commonly used in mainline traction. The drive performance can be greatly improved by operating the fully controlled converters with controlled flywheeling. The analysis and performance of a dc drive fed by two-stage sequentially operated fully controlled converters with controlled flywheeling are described. The modes of operation of the converter system are identified, and a method for calculating performance, taking these modes of operation into account, is presented. The nomograms and an analytical method of calculating them are presented for computing the optimum value of filter inductance. The performance of the drive with controlled flywheeling is compared with performance using normal control. The modes of operation and certain aspects of drive performance are verified experimentally.Item Topological energy-function analysis of stability of power systems(1987) Padiyar, K.R.; Sastry, H.S.Y.In this paper the direct stability evaluation of power systems, with voltage-dependent loads, using topological energy function is given with applications. This is based on the philosophy of a structure-preserving model for power systems. The loads are modelled as arbitrary functions of respectively bus voltages. A classical model is assumed for generators and system equations are formed using centre of angle (COA) reference. A topological energy function is developed and applied for the stability evaluation using the potential-energy boundary surface (PEBS) method. Examples of a 4-machine and a 7-machine system are considered for illustration. The critical clearing time (Tcr) is obtained both by digital simulation and by the direct method for various load characteristics and for different fault locations. � 1987.Item Transportation of granite statues(1989) Basavarajaiah, B.S.This paper deals with the problems faced during the transportation of two large granite monolith statues weighing 180 t and 120 t respectively through the narrow and winding country-roads on the western plains of the state of Karnataka. A brief resume of the problems faced during this operation and how these were overcome successfully have been presented.Item Wood burning cook stoves(1989) Nijaguna, B.T.; Uppin, S.B.The major domestic energy needs of people in the under-developed and developing countries are met by burning wood in cook stoves. The quest for energy conservation and its efficient use has motivated researchers the world over to look for improvements in wood burning cook stoves. Even a marginal increase in efficiency can contribute considerably to a total saving in energy consumption and therefore conservation. Analysis of cooking using wood shows that better energy efficiency can be achieved by complete and controlled combustion of wood, maximum energy transfer to food cooked and reducing the energy losses. The various component design features that contribute to better utilisation of wood energy are discussed. These can be of use in emerging designs, or in the modifications to the existing designs. In addition to dealing with the sizing factors, the rating or performance testing of wood stoves is detailed, thus providing a basis for comparison of different stoves. Operational guidelines that contribute to increased efficiency during cooking are provided.Item WAVE FORCE COEFFICIENTS ON SUBMARINE PIPELINES - AN OVERVIEW.(1984) Pranesh, M.R.; Somanatha, G.S.The use of submarine pipelines for economical and safe transportation of hydrocarbons is inevitable. As the applicability of pipelines are extended to other purposes, pipeline mileage is increasing alarmingly and into more hostile environment. Since wave force on submarine pipelines is identified to be a major force estimation of wave forces is of vital importance for design purposes. In this paper, an attempt has been made to identify possible reasons for discrepancies in the results of hydrodynamic coefficients. Various experimental results of wave forces on pipelines in newly constructed 2 m wide wave flume are also compared with the results available in literature. Based on the analysis, hydrodynamic coefficients to be used in the design are suggested.Item Vapor phase oxidation of p?xylene(1978) Mathur, B.C.; Viswanath, D.S.The kinetics of the vapor phase oxidation of p?xylene over ferric molybdate catalyst were studied in an isothermal, differential, tubular flow reactor in the temperature range of 360 to 420� C. The major product obtained was p?tolualdehyde with small amounts of maleic anhydride and p?toluic acid. No terephthalic acid or CO2 were observed. The reaction rate data collected fit the redox model given by Equation 1. The values of activation energies Ex, Eo and frequency factors Ax, Ao obtained are 72, 63 kJ/mol and 0.64, 2.89 m3/kg catalyst s respectively. The reaction mechanism was established by studying the oxidation of p?tolualdehyde, toluic and terephthalic acids. It is concluded that the reaction follows a parallel?consecutive scheme. Copyright � 1978 Canadian Society for Chemical EngineeringItem THREE-PHASE REGENERATIVE CONVERTER WITH CONTROLLED FLYWHEELING.(1985) Bhat, Subbanna, P.; Dubey, Gopal, K.The low-speed performance of a dc drive can be improved by operating the three-phase fully controlled bridge converter with controlled flywheeling. The analysis and performance of the drive with controlled flywheeling is described. The modes of operation of the converter system are identified, and a method for calculating performance, taking these modes of operation into account, is presented. Nomograms and an analytical method of calculating them are presented for computing the optimum value of the filter inductance. The performance of the drive with controlled flywheeling is compared with performance using conventional control. The modes of operation and certain aspects of drive performance are verified experimentally.Item The effect of the thickness of the porous material on the parallel plate channel flow when the walls are provided with non-erodible porous lining(1976) Channabasappa, M.N.; Umapathy, K.G.; Nayak, I.V.Flow through a channel whose walls are lined with non-erodible porous material is investigated using Beavers and Joseph slip boundary condition. It is shown that the effect of porous lining is to increase the mass flow rate and to decrease the friction factor. 1976 Martinus Nijhoff Publishers.