joseph bensingh - Academia.edu (original) (raw)

Papers by joseph bensingh

Wind power is a sustainable and clean source of energy. Single rotor wind turbines (SRWT) of hori... more Wind power is a sustainable and clean source of energy. Single rotor wind turbines (SRWT) of horizontal in nature are the conventional wind turbines, which are used to extract the power from wind. In the past two decades, research have been carried out on Counter Rotating Wind Turbine (CRWT) system and reported that the power extracted is relatively more for a given swept area than that of a SRWT. In the present study, a CRWT, having primary (upwind) and secondary (downwind) rotors with different diameters, which has been reported in a literature is considered and analyzed for its turbine characteristics (power, torque) using commercial software Fluent 6.2 and wind tunnel testing. The flow around the SRWT and CRWT was simulated by using finite volume method coupled with Moving Reference Frame (MRF) technique to solve the governing equations. In this present study the Standard k-ω shear stress transport turbulence model was considered. For pressure-velocity coupling of the flow second-order upwind discretization scheme (SIMPLEC) was adopted. The results on the power output from SRWT and CRWT using Computational Fluid Dynamics (CFD) have been compared with the literature values. A parametric study on axial distance between two rotors have also been investigated by CFD and it is observed that for 0.65d (d is diameter of primary rotor) the power increase is about 10% for a wind velocity of 10 m/s. Further, a scaled model of CRWT is fabricated using Rapid Prototyping-FDM technique for optimum axial distance of 0.65d with the accuracy of 0.1mm and wind tunnel testing was done with the prony brake-strain gauge assembly for variousvelocities and it is predicted that there is a power increase for CRWT comparing SRWT.

Materials Today: Proceedings

Polymeric Biomaterials and Bioengineering

International Journal of Trend in Scientific Research and Development, May 26, 2021

Advances in Polymer Sciences and Technology, 2018

Advanced engineered composites are being increasingly in demand to increase the strength-to-weigh... more Advanced engineered composites are being increasingly in demand to increase the strength-to-weight ratio for structural performance in automobile and aerospace components for reducing fuel consumption and gas emission. Hybrid composites/laminates using lightweight metal and plastics are one of the emerging trends to create such structures. The number of methods for controlling the joints of metal and plastic interface in laminate structure has been opened for research. The present study endeavors toward the effect of surface modification of the metal skin on the adhesion strength between metal skin and polymer composite core. A laminate structure with aluminum skin and epoxy-expanded polystyrene (EPS) composite was developed. The surface modification on the surface of aluminum sheet was done using sand and glass bead blasting at various pressures (3, 4, 5, 6, and 7 bar). The effect of blasting pressure and blasting medium on the adhesion strength of the laminate structure was studied. The adhesion strength between the laminate structures was observed to be improved at the optimal blasting pressure of 5 bar blasted using SS sand.

Nanoscale Graphitic Carbon Nitride, 2022

This chapter looks at the recent research trends and future development of low-dimensional carbon... more This chapter looks at the recent research trends and future development of low-dimensional carbon-based nanomaterials with particular focus on various energy conversion and storage systems. Nanostructured materials for energy devices will markedly increase, as will insights for our everyday life in the near future. In particular, multifunctional carbon nanomaterials have attracted tremendous attention in solar cells, fuel cells, flow batteries, solid-state batteries, supercapacitors, electrochemical capacitors, and compressed air energy storage. The efficiency of energy systems strongly depends on a variety of nanostructures with energy storage/conversion capacities. One of the key challenges is the development of mesoporous and/or nanoporous carbon nanomaterials with unique hierarchal structure for energy applications. This chapter addresses this challenge and gap between the topical technologies in this exciting field.

Artificial photosynthesis is a promising strategy for carbon dioxide (CO2) reduction to produce h... more Artificial photosynthesis is a promising strategy for carbon dioxide (CO2) reduction to produce hydrocarbon fuels as well as other value added products. CO2 reduction has been supreme resolution in order to mitigate the global warming and climate change and to explore the possibilities to produce renewable energies. However, the development of high-efficient artificial/synthetic photoactive materials toward CO2 reduction is very challenging as these synthetic materials often exhibit low thermodynamic stability and high rate of recombination of charge carriers during the photocatalytic process. Consequently, there are a variety of approaches such as the physical and chemical modifications of materials that have been explored toward mimicking the photosynthesis process efficiently. Of such various approaches, the development of hierarchical nanostructuring of photocatalytic materials is promising and versatile toward achieving high quantum efficiencies in CO2 conversion into fuels.

Polymers and Polymeric Composites: A Reference Series, 2018

The cellulose-based hydrogel characteristics such as biodegradability and biocompatibility mark i... more The cellulose-based hydrogel characteristics such as biodegradability and biocompatibility mark its suitability toward agriculture application. In agriculture, the hydrogels are specifically used as water reservoirs, phyto-pharmaceuticals (protected cultivations, soilless cultivations, and open-field cultivations), pesticide release, and nutrient release to the soil. The hydrogels are impregnated by fertilizer components (e.g., soluble phosphate, potassium ions, nitrogen compounds), and those chemicals which are trapped in a polymer network cannot be immediately washed out by water but gradually released into the soil and then absorbed by plants. The hydrogels are classified as two classes, i.e., soluble and insoluble hydrogels. The soluble variety is used to reduce irrigation erosion in fields. The insoluble variety is used in gardens, nurseries, and landscapes to reduce frequency of watering. They are produced either in the form of powder or of a bulky material with a well-defined shape and a strong memory of its shape after swelling. The material can be charged with small molecules, such as nutrients, to be released under a controlled kinetic. The main advantage is controlled release of water, longtime maintaining soil humidity, increase of soil porosity, and therefore better oxygenation of plant roots. The agricultural hydrogel behavior depends on various factors such as temperature, relative humidity, soil type, stress, etc. The performance of the gels is evaluated through different techniques like moisture retention, nutrition release rate, biodegradation rate, relative humidity, and temperature maintained in the soil. Several studies reveal that the amount of moisture retained in the soil is dependent on the concentration of the cellulose-based superabsorbent matrices. Those SAPs/hydrogels were used in specific agriculture application such as nutrient release, conservation of land, and drought stress reduction due to several advantages. The advantage of cellulose-based hydrogels include eco-friendliness, high water holding capacity, low cost, and biodegradability. Moreover, their application helps reduce irrigation water consumption, causes lower death rate of plants, improves fertilizer retention in soil, and increases plant growth rate.

Polymers, 2020

Polymer nanocomposites have been synthesized by the covalent addition of bromide-functionalized g... more Polymer nanocomposites have been synthesized by the covalent addition of bromide-functionalized graphene (Graphene-Br) through the single electron transfer-living radical polymerization technique (SET-LRP). Graphite functionalized with bromide for the first time via an efficient route using mild reagents has been designed to develop a graphene based radical initiator. The efficiency of sacrificial initiator (ethyl α-bromoisobutyrate) has also been compared with a graphene based initiator towards monitoring their Cu(0) mediated controlled molecular weight and morphological structures through mass spectroscopy (MOLDI-TOF) and field emission scanning electron microscopy (FE-SEM) analysis, respectively. The enhancement in thermal stability is observed for graphene-grafted-poly(methyl methacrylate) (G-g-PMMA) at 392 °C, which may be due to the influence ofthe covalent addition of graphene, whereas the sacrificial initiator used to synthesize G-graft-PMMA (S) has low thermal stability as ...

The International Journal of Advanced Manufacturing Technology, 2020

The selective laser melting (SLM) technology, a 3D printing method, has been gaining more attract... more The selective laser melting (SLM) technology, a 3D printing method, has been gaining more attraction recently due to its ability to fabricate highly complex and intricate featured medical, aerospace, automotive components. The extensive use of SLM in recent years has been augmented by readily available processing materials and distinct product features such as enhanced surface properties and improved mechanical strength of the printed products. This paper investigated the effects of support structures, building direction and post-processing on mechanical properties, surface roughness and microscopic analysis of parts printed by SLM. Support structures are required during the SLM printing process. It is desired to optimize the support structures, as this increases printing time and material consumption and reduces surface finish. Finite element analysis has been carried out prior to metal printing to optimize the support structure. It was found that the spider-cone line support shows efficient structure for this study. The mechanical properties of the fabricated specimen were studied, and experimental results were validated and compared with conventionally machined specimen. It was observed that the SLM printed parts have 20% increment in tensile strength as compared with conventionally cast specimen. However, the percent of elongation is low for SLM specimen due to large number of pores and un-melted powder presented in the printed part. In this study, the SLM specimens were subjected to heat treatment at the temperature of 550 °C for 2 h in order to achieve increment or optimal mechanical properties. The heat treatment demonstrated a 2-fold increment in elongation, as compared with the SLM as printed specimen. The present study is also aimed at evaluating the surface roughness of SLM printed specimen. It was observed that the surface roughness of SLM specimen ranged between ~ 0.3 and 3 μm. This demonstrated that SLM process is capable of providing the good surface quality component and considered an alternative process to conventional manufacturing process. The morphological studies have been carried out to support the results derived from the evaluation of mechanical properties and surface roughness. The morphological behaviour clearly shows the large pores and un-melted particles in fractured specimen. The results revealed that the support structure, build direction, orientation, surface finish and post-processing are important parameters to build a part using SLM effectively and efficiently.

Rapid Prototyping Journal, 2019

Purpose Additive manufacturing has paved a way for geometrical freedom and mass customization of ... more Purpose Additive manufacturing has paved a way for geometrical freedom and mass customization of new and innovative products. However, it has a few limitations in printing complex geometries and sizes. The purpose of this paper is three-dimensional printing of metal parts using selective laser melting (SLM) has several intricacies. Design/methodology/approach To test the capabilities of SLM, the complex geometries of varying sizes, orientations, shapes such as square and cylindrical features, thin wall structures and holes were checked for dimensional accuracy and surface roughness. Findings The outcome of the study represents the capabilities of SLM and provide insight for solving the technological issues and processing constraint in the manufacture of metal parts from aluminum alloy. The analysis has proven that there is significant accuracy in dimension for large features in comparison with smaller one. The dimensional reproducibility was determined with the aid of an optical mea...

Journal of Elastomers & Plastics, 2019

Present research endeavours towards the development of a methodology to enhance the life of hyper... more Present research endeavours towards the development of a methodology to enhance the life of hyperelastic materials in automotive suspension (leaf spring) system. The durability of the elastomeric (rubber) material in the insert was determined at various loading conditions for better operation. Three different rubber materials were used as the models including the currently used rubber material in the suspension system. The non-linear finite element analysis was carried out for the three different materials with the uniaxial stress–strain data as the input source for the material properties. A suitable hyperelastic model was also used as the input for determining the deformation and the stress concentration in the leaf spring tip insert. The failure of the tip insert was determined in various loading conditions and the best design for limited stress concentration with higher reliability was determined in the three models. The overall results are tabulated and compared for better util...

Polymer-Plastics Technology and Engineering, 2018

Polymer Light Emitting Diodes (PLEDs), the most promising name in the field of display technology... more Polymer Light Emitting Diodes (PLEDs), the most promising name in the field of display technology has received tremendous attention from various research groups. The research on light emitting polymers are an interdisciplinary zone which has challenging investigates on materials science and engineering, physics of device architecture and technology. This review addresses the wide range of tailored polymers, evolution of LED device structure for high performance, single and multicolor polymer based LEDs. Though, polymers are possessing better efficiency and easy fabrication processes, it has very low stability and short life. This study also reviews, device degradation during device fabrication and operation.

JOURNAL OF POLYMER MATERIALS, 2019

Measurement, 2019

Injection molding of bi-aspheric lens using polycarbonate material with minimum variation in volu... more Injection molding of bi-aspheric lens using polycarbonate material with minimum variation in volumetric shrinkage is crucial for optical quality and is more challenging task among the researchers. In this paper, a hybrid artificial neural networks (ANN) and particle swarm optimization (PSO) technique is used to predict the optimal process parameters of injection molding process of the bi-aspheric lens. The developed ANN network (7-13-6) was trained as well as tested with experimental data sampled from statistical methods. The well trained and tested ANN network was coupled with improved PSO algorithm as a hybrid ANN-PSO to optimize the injection molding process parameters. The optimized injection molding process parameters obtained from hybrid ANN-PSO algorithm are validated with experiments using J. S. W injection molding machine. It is observed from the lens quality parameters that the proposed hybrid ANN-PSO method optimized the injection molding process of the bi-aspheric lens with an optical power of 27.73 Diopter and the lens posses seventh order spherical aberrations.

Journal of Mechanical Science and Technology, 2016

The profile of a bi-aspheric lens is such a way that the thickness narrows down from center to pe... more The profile of a bi-aspheric lens is such a way that the thickness narrows down from center to periphery (convex). Injection molding of these profiles has high shrinkage in localized areas, which results in internal voids or sink marks when the part gets cool down to room temperature. This paper deals with the influence of injection molding process parameters such as mold surface temperature, melt temperature, injection time, V/P Switch over by percentage volume filled, packing pressure, and packing duration on the volumetric shrinkage and deflection. The optimal molding parameters for minimum variation in volumetric shrinkage and deflection of bi-aspheric lens have been determined with the application of computer numerical simulation integrated with optimization. The real experimental work carried out with optimal molding parameters and found to have a shallow and steep surface profile accuracy of 0.14 and 1.57 mm, 21.38-45.66 and 12.28-26.90 μm, 41.56-157.33 and 41.56-157.33 nm towards Radii of curvatures (RoC), surface roughness (Ra) and waviness of the surface profiles (profile error Pt), respectively.

Fiber-filled plastic materials are commonly used in metal replacement applications. The combinati... more Fiber-filled plastic materials are commonly used in metal replacement applications. The combination of low weight and high stiffness makes fiber-filled plastics ideal for high-performance applications. The key to unlocking the potential of these plastics lies in the orientation of the fibers. The orientation direction and the degree of orientation of the fibers determine the mechanical properties of the molded part. The injection moluding process for fiber-filled parts can cause great variation in strength throughout a part, the effects of the injection process should be considered in the design of such a part. In order to enable product designers to incorporate the strength variations of fiber filled, injection-molded components into mechanical analyses of those components by coupling of Moldflow injection molding simulation tools together with finite element analysis (FEA) software. By using this approach Design engineer can explore different design scenarios that will produce cheaper parts, while ensuring sufficient strength in highly loaded areas. In this paper, a Non Linear Anisotropic buckling analysis is carried out on CRC push rod component of hydraulic clutch actuation systems by coupling Moldflow with ANSYS. A comparison is made between the results from non linear isotropic and non linear anisotropic analysis with experimental results to understand the mechanical performance of the part. Simulation results are able to predict the observed mechanical behavior of fiber filled plastic components when the anisotropy of the material is taken into consideration. Traditional approach of treating the material property as isotropy overestimates the stiffness of the part. Also, modeling of flow is able to quantify the anisotropy generated in the part during its fabrication process.