Shodhganga University: MoU signed on 26th September 2013MoU signed on 26th September 2013http://hdl.handle.net/10603/265422019-09-20T02:53:20Z2019-09-20T02:53:20ZSome investigations into wire electrodischarge machining of ceramic particulate reinforced aluminium matrix compositeshttp://hdl.handle.net/10603/273022018-07-02T11:58:33Z2014-10-29T00:00:00ZTitle: Some investigations into wire electrodischarge machining of ceramic particulate reinforced aluminium matrix composites
Abstract: After more than a quarter of century of active research metal matrix composites and
newlinemore particularly aluminium matrix composites are beginning to make a significant
newlinecontribution to aerospace automotive and electronic industrial practice Although
newlinethese composites have been successfully introduced in few commercial applications
newlinetheir potential of wide spread application is still impeded due to the challenges in
newlinemachining these materials Although EDM die sinking of these materials was
newlineinvestigated by many researchers relatively very less attention was paid toward
newlinemachining of these materials using WEDM which is one of the most widely applied
newlinenon conventional machining process today The present work is therefore an attempt
newlineto investigate and reveal some of the facts associated with machining of these
newlinematerials using WEDM
newlineThe work was divided into following phases 1 Screening Experiments 2 Parametric
newlinestudies on WEDM machinability of A359 and multi objective optimization using
newlineRSM and Grey relational analysis 3 Parametric studies on WEDM machinability of
newlineA6061 multi objective optimization using RSM and Grey relational analysis 4
newlineComparative study between two types of wire electrode 5 Investigations on surface
newlinecharacteristics of the machined part 6 Comparison between machining characteristics of
newlinethese two different composites and 7 Development of semi empirical models for MRR
newlineand surface finish and comparison between the RSM model and semi empirical model
newlinepredictions with the experimental observations
newline In the screening experiments Taguchi s experimentation strategy was used In these
newlineexperiments nine machining parameters ontime offtime servo voltage maximum
newlinefeed speed wire speed wire tension ignition current open voltage and flushing
newlinepressure along with one composite specific parameter namely ceramic volume fraction
newlinewere included Based on the results of these experiments the input parameters of the
newlineparametric study were chosen
newlineThe results of multi objective optimization using a novel
newlinecombination of RSM and Grey relational analysis were found to be very promising
newlineThe material removal rate was found to improve significantly at reasonably smooth
newlinesurfaces
newlinethis work has contributed to the knowledge of WEDM of composite materials
newlineby putting forward the complexities associated with the process during machining of
newlinethis most challenging class of materials
newline
newline
newline2014-10-29T00:00:00ZStudy of decolorization of brilliant green and congo red dye bearing water by adsorption coagulation electrocoagulation and electrochemical techniqueshttp://hdl.handle.net/10603/269742018-07-09T04:19:38Z2014-10-20T00:00:00ZTitle: Study of decolorization of brilliant green and congo red dye bearing water by adsorption coagulation electrocoagulation and electrochemical techniques2014-10-20T00:00:00ZExperimental studies on heat transfer and friction factor characteristics in a square duct for laminar flow fitted with swirl flow generatorshttp://hdl.handle.net/10603/268882018-07-09T11:31:10Z2014-10-17T00:00:00ZTitle: Experimental studies on heat transfer and friction factor characteristics in a square duct for laminar flow fitted with swirl flow generators
Abstract: newline The present experimental work conducted on heat transfer augmentation using full length twisted tapes increasing and decreasing order of twist ratio sets and full length screw tapes The test liquid flows in laminar flow through an inner square duct and hot water at very high flow rate in counter current fashion through an annular channel to attain nearly uniform wall temperature conditions, using water and ethylene glycol as test liquids The inserts when placed in flow path of test liquid reduces flow passage area and creates a high degree of turbulence resulting in an increased heat transfer rate and pressure drop The work also presents the variation of friction factor, heat transfer coefficient and thermohydraulic performance ratios R1 and R3 with Reynolds number for twisted tapes and screw tapes with different twist ratios The results of a square duct fitted with twisted tapes and screw tapes with different twist ratios have been compared with a plain duct data Effects of insertion of full length twisted tapes of different twist ratio, increasing and decreasing twist ratio sets on heat transfer and pressure drop characteristics in a concentric double pipe heat exchanger square duct inner and circular tube outer were experimentally investigated The data were taken for Reynolds number well in the laminar region Re 100 to 2100 with full length twisted tapes of different twist ratios and increasing and decreasing order of twisted tapes The water flows through inner square duct and hot water at very high flow rate though an annular channel formed between a square duct and circular tube to ensure nearly a uniform wall temperature conditions The results demonstrate that as twist ratio decreases the twisted tape gives higher friction factor and better heat transfer enhancement The heat transfer coefficient hi increases and friction factor f
newlinedecreases with increasing Reynolds number Re The increasing and decreasing order of
newlinetwist ratio sets gives almost same heat transfer enhancement, as the intensi2014-10-17T00:00:00ZSettling and rheological studies of solid liquid suspensionshttp://hdl.handle.net/10603/267492018-07-09T11:24:50Z2014-10-14T00:00:00ZTitle: Settling and rheological studies of solid liquid suspensions
Abstract: In the present thesis the settling and rheological behaviour of magnetite ore suspensions
newlineare studied in aqueous CMC and guar gum solutions to investigate the effects of different parameters on them The data obtained from experimentation are suitably tailored to build data driven mathematical models for drag coefficient particle Reynolds number relationship CD ReP suspension rheological behaviour, concentration effects on suspension viscosity and artificial neural network ANN models to approximate shear stress shear rate relationship and the relative viscosity of the suspensions This thesis is structured as follows
newlineChapter 1 provides a brief overview of the solid liquid suspensions their settling and
newlinerheological behaviours and parameters which govern them Introduction of ANN is given and objectives of the thesis and thesis outline are stated in this chapter
newlineThe chapter 2 is the discussion of the previous work by other researchers In this chapter
newlineearlier studies of the effects of solids concentration and wall effects on the settling
newlinebehaviour of suspensions are described The CD ReP relationships proposed by earlier
newlineworkers are presented Investigations of other workers and their recommendations are
newlinediscussed This chapter includes discussion on rheological properties of the suspensions,
newlinethe rheological behaviours and different rheological models Further effects of system
newlineparameters like solids concentration particle size and temperature on suspension
newlineviscosity are discussed Different dispersants are also discussed The chapter concludes
newlinewith the discussion on applications of artificial neural networks in various fields of
newlinechemical engineering The third chapter gives the overview of the theory of different forces acting the particles settling velocity and the CD ReP relationships for the suspensions The rheological behaviour of suspensions and various mathematical equations used to describe the suspension behaviour are presented in this chapter Here ANN structure and its development main components, training and practical aspects of neural computing are introduced
newlineChapter 4 gives detail information of the materials and methods used for experimental
newlinework of this thesis Here the properties of the material experimental setup and procedure are discussed
newlineChapter 5 is the discussion on findings of experimental investigations its analysis and
newlinevarious models used to fit the experimental data Effects of dispersant concentration
newlinesolids concentration and particle size on the settling of the suspensions are discussed
newlinehere The mathematical formulation to calculate particle Reynolds number and drag
newlinecoefficient of settling particles and the CD ReP relationship obtained are presented The
newlinerheological nature of the suspensions under consideration effect of particle size and
newlinesolids concentration on suspension rheology is discussed and effect of temperature on
newlinesuspension viscosity is also presented in this chapter
newlineModel fitting for suspension rheology and concentration effects on suspension viscosity
newlineis presented in the last part of the chapter Reported constants of different models used to fit the data are obtained by curve fitting and using the Matjematica41 software The
newlinedevelopment of artificial neural network model for the prediction of the suspension
newlinerheology and relative viscosity their results and comparison with other models is
newlinediscussed in last section of this chapter
newlineFinally the sixth chapter of this thesis provides a summary of important results and
newlineconclusions drawn from the experimental investigations and model fitting
newline
newline2014-10-14T00:00:00Z