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Dhiman Chatterjee
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Dhiman Chatterjee
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Dhiman Chatterjee
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Chatterjee, Dhiman
Chatterjee, D.
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12 results
Now showing 1 - 10 of 12
- PublicationSlurry erosion wear resistance of polyurethane coatings with B4C Nano powders for hydroturbine applications(01-01-2013)
;Syamsundar, C.; ; Maiti, A. K.Hydropower generation from the Himalayan rivers in India face challenge in the form of silt-laden water. These sediments contain abrasive particles which can erode the turbine blades and reduce turbine life. This calls for the development of newer materials for turbine blade. To address this issue in the present investigation, 16Cr- 5Ni martensitic stainless steel has been selected and coated with polyurethane (PU) reinforced with boron carbide (B4C) nano particles to improve the wear resistance. With the increase of B4C content (0-2 wt %) in PU the mechanical properties and erosion wear resistance were investigated. The Shore hardness and pull off adhesion were found to increase with the increased content ofB4C nano particles and from contact angle measurement the coated surfaces are shown to be hydrophilic in nature. This condition reflects better wetting and may be good for cavitation wear resistance. Slurry erosive wear tests were done at various test conditions determined by Taguchi design of experiments of impact velocity, impingement angle, erodent size and slurry concentration. The erosion area of the PU coated samples were analyzed with scanning electron microscope (SEM) and the erosion wear mechanism is discussed Analysis of variance studies of erosion rate indicated that B4C content in PU material is the single most important parameter and interaction of impact velocity and impingement angle are proved to be significant Artificial Neural Network and Genetic Algorithm were employed to arrive at the worst possible scenario. - PublicationAxial-flow hydrokinetic turbine array: Optimization and performance prediction(01-01-2019)
;Sharma, L.Hydrokinetic Turbine (HKT) systems extract energy from marine currents and offer renewable technology for supplementing the energy requirements with no significant adverse effect on the environment or the habitat. However, the power output of an axial flow HKT is lower than the conventional hydraulic turbines. Hence, instead of deploying a single turbine, identical turbines may be coupled together in an array. This demands a further development in extracting maximum power available under practical conditions. In the present work three different array configurations, rectangular, equilateral triangle and isosceles triangle configurations, are discussed and the optimized configurations are taken up for further analysis. Flow velocity profiles are used to demonstrate the effect of each configuration on velocity distribution and its relation with the resultant performance of the turbine arrays. The performance of single and array of turbines are analyzed in the proximity of free surface and equilateral triangular pattern (Array 2) is found to be the best. - PublicationNumerical prediction of periodic cavitation shedding in cylindrical orifice(01-01-2015)
;Mouvanal, Sandeep ;Burkhardt, Axel; Cavitation structures inside orifice of high pressure fuel injector nozzles have a major influence on internal flow and quality of spray. The present work provides a detailed understanding of the effect of injection pressure on cavitation and its shedding in the form of cloud cavities inside a cylindrical orifice. Commercial computational fluid dynamics (CFD) software, ANSYS Fluent with Reboud’s correction on the eddy viscosity term of k-ω SST turbulence model is used for the numerical investigations. Comparison of the results with literature on experimental studies shows that the employed modification of turbulent viscosity term by a user defined function helps in prediction of reentrant jet induced cavity shedding. Compressible, multi-phase simulations revealed non-cavitating, periodic cloud shedding, super cavitating and hydraulic flip regimes. Fourier transformation is performed on the time series data of fluctuating vapor fraction to predict the frequency of shedding of cavities for various cavitation numbers. It is shown that with a reduction in cavitation number, length of cavity increases and shedding frequency decreases. - PublicationPerformance evaluation of a bulb turbine designed for ultra-low head applications(23-08-2019)
;Shandilya, Sonal ;Shelar, Sujit P. ;Prasad Das, Shyama; Saini, R. P.Hydropower is one of the most common forms of clean source of electricity and forms an important source of power for a country like India. This paper is aimed to design mini-hydropower which utilizes ultra-low head and can be used for decentralized power generation and utilization for remote villages. In order to achieve this purpose an axial flow turbine without any guide vanes is designed. This design process is adopted because the presence of inlet guide vanes in the conventional bulb turbines may pose maintenance problem of clogging and also the design is not fish friendly. Another aspect of micro- or mini-hydropower is the non-availability of large reservoirs and there is likelihood that these turbines may be installed as a run-of-the-river type with some seasonal variation of flow rate. The turbine efficiency should be as much as insensitive to the variation in flow rate as possible. In our work, the turbine is expected to produce a relatively flat efficiency flow rate-curve over a range of flow rates. The peak efficiency obtained is about 74%. There is a need to improve the peak efficiency and hence loss analysis is carried out. It was found that the swirling flow in the draft tube downstream of the turbine contributes to a monotonic increase in loss with an increase in flow rate. - PublicationNumerical prediction of the performance of axial-flow hydrokinetic turbine(01-12-2013)
;Chandras, Pavan ;Sharma, LaveenaThe present work is focused on the numerical prediction of the performance of axial flow hydrokinetic turbine under practical conditions. The models are designed to produce an electrical power output of 200 W at an incoming water speed of 1 m/s. Three different models of three-bladed turbine, based on swept direction, are designed to study the effect of geometry on the turbine performance while operating under identical conditions. Numerical simulations indicate that a peak turbine power of 480 W at a tip speed ratio of 3.5 is obtained for unswept bladed turbine with sharp trailing edge. Results suggest that forward and backward swept blades perform better than the unswept blade for blunt trailing edge. Simulations are carried out for different nose profiles for hub. It is found that a turbine experiences lesser thrust force with an ellipsoidal nose having ratio of major axis to minor axis of 4. In order to capture a real life scenario effectively, the effect of turbine location inside the water, particularly with respect to the free surface is investigated further. The safe depth for turbine installation is found to be at least 1.4 m from the free surface. - PublicationCombined silt and cavitation erosion resistance of nanoparticle reinforced polyurethane coatings on 16Cr-5Ni Martensitic stainless steel substrate(01-01-2019)
;Syamsundar, C.; Hydropower generation faces challenge in withdrawal of clean water from sand-laden rivers. This may lead to silt erosion and which, when compounded with cavitation-induced erosion of turbine blades, may lead to unexpected shutdowns. To address this issue, we have developed novel polyurethane (PU) coatings reinforced with boron carbide (B4C) or silicon carbide (SiC) nanoparticles on 16Cr-5Ni martensitic stainless steel substrate to improve resistance to silt and cavitation erosion. To the best of our understanding, the synergy between silt and cavitation erosion behaviors cannot be simulated with the available ASTM or non-standard test rigs. To overcome such shortcoming we developed a new test facility, where the submerged slurry jet impinges upon a stationary specimen, and focused ultrasonic transducer is used for cavitation erosion studies and this facility explores the possibility of synergetic effect of silt-cavitation erosion mechanisms. An interesting finding from the results is that there is an optimum amount of nanoparticles (20 wt.% B4C and 10 wt.% SiC) with respect to silt erosion and (10 wt.% B4C and 2 wt.% SiC) with respect to cavitation erosion, where mass removal is the minimum. Comparison of pure silt, pure cavitation and combine silt-cavitation erosion characteristics obtained using this experimental test facility, demonstrate enhanced erosion in case of combined silt-cavitation studies. This has been explained in terms of surface characteristics of coatings using scanning electron microscopy (SEM) images. - PublicationNumerical investigation of the effect of leakage flow on cavitation in centrifugal pump(25-05-2021)
;Moganaradjou, Yashwant ;Phukan, Anindita Apurbaa; Numerical studies on pumps emphasize mainly on modelling the interactions between the impeller and the volute to obtain an accurate understanding of the physics involved. However, the importance of modelling leakage paths, which is known to have a significant influence on the flow structure in the pump, necessitates an in-depth analysis. This activity is undertaken in this paper by investigating a specific case of a centrifugal pump. Numerical studies have been conducted on the pump modelled with and without leakages for the design condition. The sliding mesh method is used to obtain single phase pressure pulsations data at some important locations in the volute and the leakage path, and transient Multiple Reference Frame (MRF) modelling is utilized to conduct the cavitation analysis. It is observed that for the case under study, the pressure pulsations pattern and the cavitation behaviour varies significantly due to the inclusion of leakage paths in the analysis. - PublicationThe role of encapsulated microbubbles in the diagnosis of stenosis in arteries(03-12-2015)
;Agarwal, KarunaNumerical modelling of sound scattered by ultrasound contrast agent bubbles in arteries is presented. Nonlinear dynamics of an encapsulated microbubble coupled with transmission of sound through liquid-filled flexible tubing is developed. Based on the frequency response, a normal artery can be distinguished from that of a stenosed artery. Effects of parameters like incident pressure amplitude, driving frequency and degree of stenosis are studied. It is further found that the effect of variable pressure produced by blood flow does not have a significant effect on the observed sound pressure levels. - PublicationCavitation wear resistance of polyurethane coatings reinforced with SiC nanoparticles for hydraulic machinery applications(01-01-2014)
;Syamsundar, C.; ; Maiti, A. K. - PublicationCharacterization and ultrasound-pulse mediated destruction of ultrasound contrast microbubbles(01-12-2006)
;Sarkar, Kausik ;Jain, PankajIntravenously injected encapsulated microbubbles improve the contrast of an ultrasound image. Their destruction is used in measuring blood flow, stimulating arteriogenesis, and drug delivery. We measure attenuation and scattering of ultrasound through solution of commercial contrast agents such as Sonazoid and Definity. We have developed a number of different interfacial rheology models for the encapsulation of such microbubbles. By matching with experimentally measured attenuation, we obtain the characteristic rheological parameters. We compare model predictions with measured subharmonic responses. We also investigate microbubble destruction under acoustic excitation by measuring time-varying attenuation data. © 2006 American Institute of Physics.