Faculty Publications

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Author: search.filters.author.Vishwanath, K.P.Has files: No

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    An optimal process model for a real time process
    (CEUR-WS, 2015) Thomas, L.; Manoj Kumar, M.V.; Annappa, B.; Vishwanath, K.P.
    Recommending an optimal path of execution and a complete process model for a real time partial trace of large and complex organization is a challenge. The proposed AlfyMiner (αyMiner) does this recommendation in cross organization process mining technique by comparing the variants of same process encountered in different organization. αyMiner proposes two novel techniques Process Model Comparator (αyComp) and Resource Behaviour Analyser (RBAMiner). αyComp identifies Next Probable Activity of the partial trace along with the complete process model of the partial trace. RBAMineridentifies the resources preferable for performing Next Probable Activity and analyse their behaviour based on performance, load and queue. αyMiner does this analysis and recommend the best suitable resource for performing Next Probable Activity and process models for the real time partial trace. Experiments were conducted on process logs of CoSeLoG Project1 and 72% of accuracy is obtained in identifying and recommending NPA and the performance of resources were optimized by 59% by decreasing their load.
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    Squeezing of Bingham Fluid Between Two Plane Annuli
    (Springer Heidelberg, 2018) Singeetham, S.; Vishwanath, K.P.
    In this study, the presence of Bingham fluid between two parallel plane annuli with constant squeeze motion is theoretically analyzed. The effect of radius of separation on core thickness, pressure distribution, and squeeze force for different values of Bingham number has been investigated. By considering equilibrium of an element of the core in the fluid, thickness of the rigid plug core has been calculated numerically. The properties of the squeeze film are investigated through the non-Newtonian effects on the squeeze force of the plane for various annular spaces. © Springer Nature Singapore Pte Ltd 2018.
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    Rheodynamic lubrication of a squeeze film bearing under sinusoidal squeeze motion
    (Springer Science and Business Media, LLC, 2007) Kandasamy, A.; Vishwanath, K.P.
    Lubricants with variable viscosity are assuming importance for their applications in polymer industry, thermal reactors and in biomechanics. With the bearing operations in machines being subjected to high speeds, loads, increasing mechanical shearing forces and continually increasing pressures, there has been an increasing interest to use non-Newtonian fluids characterized by an yield value. The most elementary constitutive equation in common use that describes a material which yields is that of Bingham fluid. In the present work, the problem of a circular squeeze film bearing lubricated with Bingham fluid under the sinusoidal squeeze motion has been analyzed. The shape and extent of the core for the case of sinusoidal squeeze motion has been determined numerically for various values of the Bingham number. Numerical solutions have been obtained for the bearing performances such as pressure distribution and load capacity for different values of Bingham number, Reynolds number and for various amplitudes of squeeze motion. The effects of fluid inertia, non-Newtonian characteristics, and the amplitudes of squeeze motion on the bearing performances have been discussed. Copyright © 2007 SBMAC.
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    Inertia effects in circular squeeze film bearing using Herschel-Bulkley lubricants
    (2010) Vishwanath, K.P.; Kandasamy, A.
    Recent engineering trends in lubrication emphasize that in order to analyze the performance of bearings adequately, it is necessary to take into account the combined effects of fluid inertia forces and non-Newtonian characteristics of lubricants. In the present work, the effects of fluid inertia forces in the circular squeeze film bearing lubricated with Herschel-Bulkley fluids with constant squeeze motion have been investigated. Herschel-Bulkley fluids are characterized by an yield value which leads to the formation of a rigid core in the flow region. The shape and extent of the core formation along the radial direction is determined numerically for various values of Herschel-Bulkley number and power-law index. The bearing performances such as pressure distribution and load capacity for different values of Herschel-Bulkley number, Reynolds number, power-law index have been computed. The effects of fluid inertia and non-Newtonian characteristics on the bearing performances have been discussed. © 2009 Elsevier Inc. All rights reserved.
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    The effect of initial momentum flux on the circular hydraulic jump
    (American Society of Mechanical Engineers (ASME) infocentral@asme.org, 2015) Vishwanath, K.P.; Dasgupta, R.; Govindarajan, R.; Sreenivas, K.R.
    Earlier studies on the circular hydraulic jump have shown that the radial position of the hydraulic jump depends on the flow rate, gravity, and fluid viscosity. In this study, results from numerical simulations and experiments on circular hydraulic jumps are presented and through analysis, it is shown that the momentum flux is an additional controlling parameter in determining the jump location. Apart from the jump location, the variation of the film thickness with flow parameters is also obtained from experiments and numerical simulations. By including the dependence of the momentum flux and dissipation in the film along with other controlling parameters, the data on jump radius obtained from experiments and simulation (including the present study) covering a wide range of parameters reported in the literature can be collapsed on to a single curve. © © 2015 by ASME.