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Search Results: 1 - 10 of 27121 matches for " Dr. BIMLESH KUMAR "
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NUMERICAL AND EXPERIMENTAL STUDY OF SHAPE MEMORY ALLOY ACTUATED DVA FOR VIBRATION CONTROL OF CANTILEVER BEAM
R. B. BARJIBHE, Dr. BIMLESH KUMAR
International Journal of Mechanical Engineering & Technology (IJMET) , 2016,
Abstract: Shape memory alloys (SMAs) are one of the most widely used smart materials in many applications because of their shape memory effect property and pseudo elastic behaviour. This paper describes numerical and experimental platform which analyzes and controls the vibration of a Shape Memory Alloy (SMA) actuated cantilever beam. The system consists of cantilever beam fixed with C Clamp. The shaker is used to generate real time vibration with the help of function generator. The SMA springs with mass is attached at the free end. The experiments were carried out by using SMA and conventional spring. The FFT, accelerometer and non contact type displacement sensor were interfaced with PAK software to note the results. According to the experimental setup the cantilever beam with spring mass system is modelled in ANSYS Workbench R15.0. And harmonic response analysis was done, and results are compared over range of frequencies.
Energy Dissipation and Shear Rate with Geometry of Baffled Surface Aerator
Bimlesh Kumar
Chemical Engineering Research Bulletin , 2010,
Abstract: The geometric parameters of surface aeration systems govern the process phenomena. The dissipation rate of turbulent kinetic energy (ε) and shear rate (γ) are the key process parameters for mixing in surface aerators. Present work by doing numerical computation by visimix analyzes the effect of geometric parameters (impeller diameter, cross-sectional area of the tank, liquid height, width of the baffle, rotor blade length and immersion height) on ε and γ. Analysis has been done by making the geometric parameters non-dimensionalized through rotor diameter. With an increase in liquid height and baffled width, there is an increase in the case of energy dissipation and shear rate values. In the case of tank area and blade length, it is vice versa. Energy dissipation and shear rate are not affected by the variation in immersion height of the impeller.
Variability of Energy Dissipation and Shear Rate with Geometry in Unbaffled Surface Aerator
Bimlesh Kumar
Bulletin of Chemical Reaction Engineering & Catalysis , 2009, DOI: 10.9767/bcrec.4.2.30.55-60
Abstract: mixing in surface aerators. At constant dynamic variables (rotational speed), both and γ are greatly affected by the geometric parameters (impeller diameter, cross-sectional area of the tank, liquid height, rotor blade length and immersion height). By doing numerical computation by VISIMIX , present work analyzes the effect of non-dimensional (which is non-dimensionalized through rotor diameter) geometric parameters on e and g. With an increase in liquid height, there is an increase in the case of energy dissipation and shear rate values. In the case of tank area and blade length, it is vice versa. Energy dissipation and shear rate are not affected by the variation in immersion height of the impeller. 2009 BCREC UNDIP. All rights reserved [Received: 17 October 2009, Revised: 12 December 2009, Accepted: 20 December 2009] [How to Cite: B. Kumar. (2009). Variability of Energy Dissipation and Shear Rate with Geometry in Unbaffled Surface Aerator. Bulletin of Chemical Reaction Engineering and Catalysis, 4(2): 55-60. doi:10.9767/bcrec.4.2.30.55-60] [How to Link/ DOI: http://dx.doi.org/10.9767/bcrec.4.2.30.55-60 ]
Analytical Formulation of the Correction Factor Applied in Einstein and Barbarossa Equation (1952)
Achanta Ramakrishna Rao , Bimlesh Kumar
Journal of Hydrology and Hydromechanics , 2009, DOI: 10.2478/v10098-009-0004-2
Abstract: Einstein-Barbarossa velocity or resistance equation (1952) is widely used to find resistance to flow in alluvial channel. In order to validate the equation in all ranges (smooth to rough); they introduced a correction factor based on the Nikuradse measurement. This correction factor is determined from the graphical method, which can be erroneous. Present work reanalyzes the Nikuradse measurements and gives an analytical formulation for the correction factor.
CFD simulation of flow patterns in unbaffled stirred tank with CD-6 impeller
Devi Tamphasana Thiyam,Kumar Bimlesh
Chemical Industry and Chemical Engineering Quarterly , 2012, DOI: 10.2298/ciceq111130029d
Abstract: Understanding the flow in stirred vessels can be useful for a wide number of industrial applications. There is a wealth of numerical simulations of stirring vessels with standard impeller such as Rushton turbine and pitch blade turbine. Here, a CFD study has been performed to observe the spatial variations (angular, axial and radial) of hydrodynamics (velocity and turbulence field) in unbaffled stirred tank with Concave-bladed Disc turbine (CD-6) impeller. Three speeds (N=296, 638 & 844.6 rpm) have been considered for this study. The angular variations of hydrodynamics of stirred tank were found very less as compared to axial and radial variations.
Radial Basis Function Network Based Design of Incipient Motion Condition of Alluvial Channels with Seepage
Bimlesh Kumar, Gopu Sreenivasulu, Achanta Ramakrishna Rao
Journal of Hydrology and Hydromechanics , 2010, DOI: 10.2478/v10098-010-0010-4
Abstract: Incipient motion is the critical condition at which bed particles begin to move. Existing relationships for incipient motion prediction do not consider the effect of seepage. Incipient motion design of an alluvial channel affected from seepage requires the information about five basic parameters, i.e., particle size d, water depth y, energy slope Sf, seepage velocity vs and average velocity u. As the process is extremely complex, getting deterministic or analytical form of process phenomena is too difficult. Data mining technique, which is particularly useful in modeling processes about which adequate knowledge of the physics is limited, is presented here as a tool complimentary to model the incipient motion condition of alluvial channel at seepage. This article describes the radial basis function (RBF) network to predict the seepage velocity vs and average velocity u based on experimental data of incipient condition. The prediction capability of model has been found satisfactory and methodology to use the model is also presented. It has been found that model predicts the phenomena very well. With the help of the RBF network, design curves have been presented for designing the alluvial channel when it is affected by seepage.
Optimal Geometric Configuration for Power Consumption in Baffled Surface Aeration Tanks
Bimlesh Kumar,Thiyam Tamphasana Devi,Ajey Kumar Patel
Bulletin of Chemical Reaction Engineering & Catalysis , 2010, DOI: 10.9767/bcrec.5.2.795.87-93
Abstract: The power usage in mass transfer operations is very important in judging the aeration performance of theaerator on which geometry of the aeration tank imparts a major effect. Optimal geometric conditions arealso needed to scale up the laboratory result to the field installation. Finding geometrical optimal conditionsof a surface aeration system through experiments involves physical constraints and classically parameterscan be optimized by varying one variable at one time and keeping others at constant. In the realexperimental process, it is not possible to vary all others geometric parameters simultaneously. In such acase, the model of the system is built through computer simulation, assuming that the model will result inadequate determination of the optimum conditions for the real system. In this paper, functional model ofpower consumption in the surface aeration systems has been obtained by using neural network technique.Predictability capability of such functional model has been found satisfactorily. In process of optimization,the pertinent dynamic parameter is divided into a finite number of segments over the entire range of observations.For each segment of the dynamic parameter, the neural network model is optimized for the geometricalparameters spanning over the entire range of observations. 2010 BCREC UNDIP. All rights reserved(Received: 29th May 2010, Revised: 12nd August 2010, Accepted: 7th September 2010)[How to Cite: B. Kumar, T.T. Devi, A.K. Patel, A. Bhatla. (2010). Optimal Geometric Configuration for Power Consumption in Baffled Surface Aeration Tanks. Bulletin of Chemical Reaction Engineering and Catalysis, 5 (2): 87-93. doi:10.9767/bcrec.5.2.795.87-93]
An integrated networking approach for a sustainable textile sector in Solapur, India
Rahul B. Hiremath,Ruth Kattumuri,Bimlesh Kumar,Vishwas N. Khatri
Urbani Izziv , 2012,
Abstract: This article addresses the environmental aspects of an unorganised textile sector with large-scale employment through a case study of the city of Solapur in the state of Maharashtra, India. Waste generated from the textile sector is causing serious problems such as changes to land and agricultural patterns, air quality, health and biodiversity. The methodology includes qualitative and quantitative data regarding the possible impact on climate, health, agriculture, biodiversity, water, air and soil. A detailed analysis was carried out through an extensive literature review. A possible solution in the form of a sustainable networking model for mitigating change is suggested. The sustainable model with integration of information and communication technology (ICT) will help achieve the desired development goals. The role of ICT is to channelise the supply chain, which can increase the efficiency and competitiveness of the sector.
Celostni pristop mre enja za trajnostno tekstilno panogo v indijskem mestu Solapur
Rahul B. Hiremath,Ruth Kattumuri,Bimlesh Kumar,Vishwas N. Khatri
Urbani Izziv , 2012,
Abstract: Prek tudije mesta Solapur v indijski dr avi Mahara tra se v lanku obravnavajo okoljski vidiki neorganizirane tekstilne panoge, ki zaposluje veliko tevilo ljudi. Odpadki, ki jih ustvarja tekstilna panoga, povzro ajo spremembe zemlji kih in kmetijskih vzorcev, kakovosti zraka in biotske raznovrstnosti ter zdravstvene te ave. Uporabljena metodologija vklju uje kvalitativne in kvantitativne podatke o mogo em vplivu na podnebje, zdravje, kmetijstvo, biotsko raznovrstnost, vodo, zrak in prst. V okviru raziskave je bila opravljena obse na podrobna analiza literature in predlagana morebitna re itev v obliki trajnostnega modela mre enja za bla enje sprememb. Trajnostni model bo z informacijsko in s komunikacijsko tehnologijo (IKT) pomagal dose i elene razvojne cilje. Vloga IKT je usmeriti oskrbovalno verigo, kar lahko pove a u inkovitost in konkuren nost panoge.
Impeller Submergence Depth for Stirred Tanks
Thiyam T. Devi,Annu P. Sinha,Meena Thakre,Bimlesh Kumar
Bulletin of Chemical Reaction Engineering & Catalysis , 2011, DOI: 10.9767/bcrec.6.2.826.123-128
Abstract: Impeller submergence governs the performance of mixing tanks employed in oxygen transfer operation. Present work experimentally investigates the effect of impeller submergence depths on oxygen transfer and corresponding power consumption. It has been found that at higher range of impeller submergence, mixing tanks consume less power and gives higher values of oxygen transfer coefficient. Optimal range of submergence depth is 0.7 to 0.9 times the impeller diameter. Copyright 2011 BCREC UNDIP. All rights reserved. (Received: 4th March 2011; Revised: 12nd July 2011; Accepted: 14th July 2011) [How to Cite: T.T. Devi, A.P. Sinha, M. Thakre, and B. Kumar. (2011). Impeller Submergence Depth for Stirred Tanks. Bulletin of Chemical Reaction Engineering & Catalysis, 6 (2): 123-128. doi:10.9767/bcrec.6.2.826.123-128] [How to Link / DOI: http://dx.doi.org/10.9767/bcrec.6.2.826.123-128 ] | View in
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