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Papers by GURUKARTHIK BABU B

IEEE Canadian Journal of Electrical and Computer Engineering

Solid State Technology, Feb 12, 2021

Solid State Technology, 2020

The aim of this work is to analyze the increased thermal conductivity of epoxy matrix with additi... more The aim of this work is to analyze the increased thermal conductivity of epoxy matrix with addition of nano fillers and its cooling impact on dry type transformer winding. Transformer being an inductive device generates large amount of heat, making it vulnerable to damages. In this work, Nano Alumina (NAL) particles were chosen as filler and it blended with epoxy resin to yield a composite with high thermal conductivity. NAL powder was prepared by ball-milling process and casted into mold with epoxy matrix. Mechanical properties (tensile, flexural and impact), Thermal studies and morphological tests were taken to analyse the performance of the composite. With increased thermal conductivity of NAL/Epoxy composite, the temperature of the transformer decreases which yields higher efficiency. This paper looks into the feasibility of a nano alumina /epoxy composite to yield a reliable insulator cum solid coolant.

The use of polymer composite insulators has grown in the recent past power generation, transmissi... more The use of polymer composite insulators has grown in the recent past power generation, transmission and distribution. There are many materials which are being used in polymer composite insulator and several testing is needed. But, it is time consuming to test the material and requires lots of equipment. Even each and every insulator design has to undergo a series of test before using it in transmission and distribution lines. In order to reduce the cycle time of design work and the cost of prototype testing, technical software packages are used. Once the design was done, it can be tested under various parameters in the package itself and no direct inspection or testing is needed. Here, COMSOL-Multiphysics technical package is used to model the insulators under several applied voltages and relative electrical stress. The package is used to analyze different shed placements for various profiles based on creepage distance. The insulators are designed according to the standard specifica...

Journal of Natural Fibers, 2020

This investigation is aimed to analyze the effect of sodium hydroxide (NaOH) treatment on the phy... more This investigation is aimed to analyze the effect of sodium hydroxide (NaOH) treatment on the physical, chemical, structural, thermal and surface topography of Phaseolus vulgaris fibers (PVFs). The surface of raw PVFs was modified by soaking with 5% NaOH solution for 15, 30, 45 and 60 min. The various functional groups of the alkali-treated PVFs (APVFs) were studied Fourier-transform infrared spectroscopy. The outcomes of thermogravimetric analysis evident that the optimum treatment time for 5% NaOH was 45 min. It was noticed that optimally treated PVFs have higher cellulose (69.48 wt.%), crystallinity index (52.27%) and lower hemicellulose (4.30 wt. %), lignin (7.02 wt.%) contents. The thermogravimetric analysis (TGA) of PVFs also revealing moderate thermal stability was observed; atomic force microscopy (AFM) investigation inveterates that the surface of the fiber is rough and it will be a potential reinforcement for polymer composites. 摘要 本研究旨在分析氢氧化钠(NaOH)处理对相生纤维(PVFs)物理、化学、结 构、热及表面形貌的影响. 用5%氢氧化钠溶液分别浸泡15、30、45、60分 钟，对生相木纤维表面进行改性. 研究了经碱处理的相角纤维(APVFs)的各 种官能团的傅里叶变换红外光谱. 热重分析结果表明，5%氢氧化钠的最佳 治疗时间为45分钟. 结果表明，经优化处理的普通相木纤维纤维素含量较 高(69.48 wt.%)，结晶度指数较低(52.27%)，半纤维素含量较低(4.30 wt.%)， 木质素含量较低(7.02 wt.%). 通过热重分析(TGA)发现，相生纤维具有一定的 热稳定性，原子力显微镜(AFM)研究发现，相生纤维表面粗糙，是一种潜 在的增强高分子复合材料的材料.

Journal of Natural Fibers, 2020

In this study, the electrical, thermal, and mechanical properties of hybrid natural fiber composi... more In this study, the electrical, thermal, and mechanical properties of hybrid natural fiber composite are taken under consideration. Fly ash waste is used as the filler material. Unsaturated polyester resin is used as the matrix material to bind the composite. Alkali-treated Phaseolus vulgaris fiber (PVF) (5% NaOH for 45 min) is taken as the primary filler. Nanosilica synthesized is added to the composite samples at a constant percentage (1%). Samples of various weight percentages are prepared (2%, 4%, 6%, 8%, and 10% of PVF) and studied. Dielectric strength test for electrical property, thermal conductivity test for the thermal property, mechanical tests like tensile strength, Brinell hardness, Izod impact tests, and water absorption test are also taken under consideration. The composite showed a regular increasing trend in mechanical and electrical properties with varying weight percentages until 6% PVF; afterward, a decreasing trend in the mechanical and electrical properties of the composite was found with greater weight percentages. Whereas for thermal conductivity and water absorption tests, the results showed a regular decreasing trend until 6% PVF; afterward an increasing trend was found. It is found that the composite of 6% PVF and 1% SiO 2 shows better electrical, thermal, and mechanical properties. 摘要 本研究考虑天然纤维混杂复合材料之电、热及力学性质. 粉煤灰废料用作 填料. 以不饱和聚酯树脂为基体材料对复合材料进行了粘结. 以碱处理的 菜豆纤维(PVF)(5%NaOH，45min)为主要填料. 合成的纳米二氧化硅 以1%的比例加入到复合材料中. 制备了不同重量百分比的样品(PVF的2、 4、6、8和10%)，并对其进行了研究. 还考虑了电气性能的介电强度试 验、热性能的导热性试验、拉伸强度、布氏硬度、Izod冲击试验和吸水性 试验等机械试验. 复合材料的力学性能和电学性能随重量百分比的变化呈 规律性的增加趋势，直到6%PVF后，随着重量百分比的增加，复合材料的 力学性能和电学性能下降. 而对于热导率和吸水率，则表现出规律性的下 降，直到6%PVF后才开始上升. 结果表明，6%PVF和1%SiO2的复合材料具 有较好的电学、热学和力学性能.

Journal of Natural Fibers, 2019

This study investigates the dielectric efficiency of a composite prepared using a fiber extracted... more This study investigates the dielectric efficiency of a composite prepared using a fiber extracted from Phaseolus vulgaris. The extraction of fiber was statistically modeled using face-centered central composite design. The concentration of NaOH and extraction time was taken as the process variables and dielectric strength was taken as the response. The numerically optimized model for the extraction of fiber from Phaseolus vulgaris of alkali treatment showed 14.325 kV/cm as dielectric strength of initial NaOH concentration of 3% and time period of 51 min. The model was significant with R 2 = 0.9323 and adjusted R 2 = 0.884. The linear, quadratic & interactive relationship between the response (dielectric strength) and variables (NaOH & time) was also established. This study explains the importance of NaOH and time period in establishing the fiber extraction by the alkali treatment process. 摘要 本研究研究使用从西多卢斯提取的纤维制备的复合材料的电介质效率. 纤维 的提取采用以面为中心的中央复合设计进行统计建模. 以NaOH的浓度和提 取时间作为过程变量和介电强度作为响应. 碱处理的Phaseolus纯化纤维提取 数值优化模型显示，初始NaOH浓度为3%，周期为51分钟，介电强度为 14.325千伏/厘米. 该模型在 R2 = 0.9323 和调整后的 R2 = 0.884 时显著. 建立了 响应(电强度)和变量(NaOH + time)之间的线性、二次和交互关系. 本研 究阐述了NaOH和时间段在碱处理工艺建立纤维提取过程中的重要性.

Journal of Natural Fibers, 2018

Characterization of new natural fibres from various parts of plants have become increasingly popu... more Characterization of new natural fibres from various parts of plants have become increasingly popular not only in textile industries, automotive sector, electrical applications, and construction industries, but in various industrial applications because of their versatile characteristics, availability, biodegradability and providing sustainable solutions to support technical innovation. This study aimed to determine the characterization and physicochemical properties of Phaseolus vulgaris fibers (PVF) by Thermo gravimetric analysis (TGA)/DTG, X-Ray Diffraction analysis (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). Eventually, fourier transform analysis and XRD analysis of PVFs demonstrated the presence of cellulose with a crystallinity index of 43.01%. The surface morphological analysis was observed and reveals that PVFs contain rougher surfaces, which would be favourable to develop good bonding with the matrix for making composites. 摘要 从植物各部分新的天然纤维特性已成为纺织行业，汽车行业越来越受欢 迎，不仅、电器、建筑等行业，但在各种工业应用中，由于其灵活的特 性，可用性、可降解性和支持技术创新提供可持续的解决方案。本研究的 目的是确定菜豆纤维的特性和理化性质 (PVF) 通过热重分析、差热分析 (TGA/DTG)、X射线衍射分析 (XRD) 、傅里叶变换红外光谱 (FTIR) 和扫描电子 显微镜 (SEM) 。最终，傅里叶变换分析和X射线衍射分析证明存在与PVFS的 纤维素的结晶度指数43.01%。观察其表面形态分析和揭示，菜豆纤维中含 有粗糙的表面，这将有利于培养良好的粘结基质复合材料。

Owing to the continuous development towards the miniaturization of electronics, newer dielectric ... more Owing to the continuous development towards the miniaturization of electronics, newer dielectric materials were sought which would enable to achieve high energy density for many applications. To achieve a compact and reliable design of electrical equipment for the present day requirements, there is an urgent need for better and smart insulating materials and in this respect, the reported enhancements in dielectric properties obtained for polymer nanocomposites seems to be very encouraging. Such change was often favourable for engineering purpose. In this case, we obtain a high dielectric permittivity and low dielectric loss. So, it can be used in many applications like electrical insulation for power apparatus, power cables, insulated wires and outdoor insulators too.

Fullerenes, Nanotubes and Carbon Nanostructures

IEEE Canadian Journal of Electrical and Computer Engineering

Solid State Technology, Feb 12, 2021

Solid State Technology, 2020

The aim of this work is to analyze the increased thermal conductivity of epoxy matrix with additi... more The aim of this work is to analyze the increased thermal conductivity of epoxy matrix with addition of nano fillers and its cooling impact on dry type transformer winding. Transformer being an inductive device generates large amount of heat, making it vulnerable to damages. In this work, Nano Alumina (NAL) particles were chosen as filler and it blended with epoxy resin to yield a composite with high thermal conductivity. NAL powder was prepared by ball-milling process and casted into mold with epoxy matrix. Mechanical properties (tensile, flexural and impact), Thermal studies and morphological tests were taken to analyse the performance of the composite. With increased thermal conductivity of NAL/Epoxy composite, the temperature of the transformer decreases which yields higher efficiency. This paper looks into the feasibility of a nano alumina /epoxy composite to yield a reliable insulator cum solid coolant.

The use of polymer composite insulators has grown in the recent past power generation, transmissi... more The use of polymer composite insulators has grown in the recent past power generation, transmission and distribution. There are many materials which are being used in polymer composite insulator and several testing is needed. But, it is time consuming to test the material and requires lots of equipment. Even each and every insulator design has to undergo a series of test before using it in transmission and distribution lines. In order to reduce the cycle time of design work and the cost of prototype testing, technical software packages are used. Once the design was done, it can be tested under various parameters in the package itself and no direct inspection or testing is needed. Here, COMSOL-Multiphysics technical package is used to model the insulators under several applied voltages and relative electrical stress. The package is used to analyze different shed placements for various profiles based on creepage distance. The insulators are designed according to the standard specifica...

Journal of Natural Fibers, 2020

This investigation is aimed to analyze the effect of sodium hydroxide (NaOH) treatment on the phy... more This investigation is aimed to analyze the effect of sodium hydroxide (NaOH) treatment on the physical, chemical, structural, thermal and surface topography of Phaseolus vulgaris fibers (PVFs). The surface of raw PVFs was modified by soaking with 5% NaOH solution for 15, 30, 45 and 60 min. The various functional groups of the alkali-treated PVFs (APVFs) were studied Fourier-transform infrared spectroscopy. The outcomes of thermogravimetric analysis evident that the optimum treatment time for 5% NaOH was 45 min. It was noticed that optimally treated PVFs have higher cellulose (69.48 wt.%), crystallinity index (52.27%) and lower hemicellulose (4.30 wt. %), lignin (7.02 wt.%) contents. The thermogravimetric analysis (TGA) of PVFs also revealing moderate thermal stability was observed; atomic force microscopy (AFM) investigation inveterates that the surface of the fiber is rough and it will be a potential reinforcement for polymer composites. 摘要 本研究旨在分析氢氧化钠(NaOH)处理对相生纤维(PVFs)物理、化学、结 构、热及表面形貌的影响. 用5%氢氧化钠溶液分别浸泡15、30、45、60分 钟，对生相木纤维表面进行改性. 研究了经碱处理的相角纤维(APVFs)的各 种官能团的傅里叶变换红外光谱. 热重分析结果表明，5%氢氧化钠的最佳 治疗时间为45分钟. 结果表明，经优化处理的普通相木纤维纤维素含量较 高(69.48 wt.%)，结晶度指数较低(52.27%)，半纤维素含量较低(4.30 wt.%)， 木质素含量较低(7.02 wt.%). 通过热重分析(TGA)发现，相生纤维具有一定的 热稳定性，原子力显微镜(AFM)研究发现，相生纤维表面粗糙，是一种潜 在的增强高分子复合材料的材料.

Journal of Natural Fibers, 2020

In this study, the electrical, thermal, and mechanical properties of hybrid natural fiber composi... more In this study, the electrical, thermal, and mechanical properties of hybrid natural fiber composite are taken under consideration. Fly ash waste is used as the filler material. Unsaturated polyester resin is used as the matrix material to bind the composite. Alkali-treated Phaseolus vulgaris fiber (PVF) (5% NaOH for 45 min) is taken as the primary filler. Nanosilica synthesized is added to the composite samples at a constant percentage (1%). Samples of various weight percentages are prepared (2%, 4%, 6%, 8%, and 10% of PVF) and studied. Dielectric strength test for electrical property, thermal conductivity test for the thermal property, mechanical tests like tensile strength, Brinell hardness, Izod impact tests, and water absorption test are also taken under consideration. The composite showed a regular increasing trend in mechanical and electrical properties with varying weight percentages until 6% PVF; afterward, a decreasing trend in the mechanical and electrical properties of the composite was found with greater weight percentages. Whereas for thermal conductivity and water absorption tests, the results showed a regular decreasing trend until 6% PVF; afterward an increasing trend was found. It is found that the composite of 6% PVF and 1% SiO 2 shows better electrical, thermal, and mechanical properties. 摘要 本研究考虑天然纤维混杂复合材料之电、热及力学性质. 粉煤灰废料用作 填料. 以不饱和聚酯树脂为基体材料对复合材料进行了粘结. 以碱处理的 菜豆纤维(PVF)(5%NaOH，45min)为主要填料. 合成的纳米二氧化硅 以1%的比例加入到复合材料中. 制备了不同重量百分比的样品(PVF的2、 4、6、8和10%)，并对其进行了研究. 还考虑了电气性能的介电强度试 验、热性能的导热性试验、拉伸强度、布氏硬度、Izod冲击试验和吸水性 试验等机械试验. 复合材料的力学性能和电学性能随重量百分比的变化呈 规律性的增加趋势，直到6%PVF后，随着重量百分比的增加，复合材料的 力学性能和电学性能下降. 而对于热导率和吸水率，则表现出规律性的下 降，直到6%PVF后才开始上升. 结果表明，6%PVF和1%SiO2的复合材料具 有较好的电学、热学和力学性能.

Journal of Natural Fibers, 2019

This study investigates the dielectric efficiency of a composite prepared using a fiber extracted... more This study investigates the dielectric efficiency of a composite prepared using a fiber extracted from Phaseolus vulgaris. The extraction of fiber was statistically modeled using face-centered central composite design. The concentration of NaOH and extraction time was taken as the process variables and dielectric strength was taken as the response. The numerically optimized model for the extraction of fiber from Phaseolus vulgaris of alkali treatment showed 14.325 kV/cm as dielectric strength of initial NaOH concentration of 3% and time period of 51 min. The model was significant with R 2 = 0.9323 and adjusted R 2 = 0.884. The linear, quadratic & interactive relationship between the response (dielectric strength) and variables (NaOH & time) was also established. This study explains the importance of NaOH and time period in establishing the fiber extraction by the alkali treatment process. 摘要 本研究研究使用从西多卢斯提取的纤维制备的复合材料的电介质效率. 纤维 的提取采用以面为中心的中央复合设计进行统计建模. 以NaOH的浓度和提 取时间作为过程变量和介电强度作为响应. 碱处理的Phaseolus纯化纤维提取 数值优化模型显示，初始NaOH浓度为3%，周期为51分钟，介电强度为 14.325千伏/厘米. 该模型在 R2 = 0.9323 和调整后的 R2 = 0.884 时显著. 建立了 响应(电强度)和变量(NaOH + time)之间的线性、二次和交互关系. 本研 究阐述了NaOH和时间段在碱处理工艺建立纤维提取过程中的重要性.

Journal of Natural Fibers, 2018

Characterization of new natural fibres from various parts of plants have become increasingly popu... more Characterization of new natural fibres from various parts of plants have become increasingly popular not only in textile industries, automotive sector, electrical applications, and construction industries, but in various industrial applications because of their versatile characteristics, availability, biodegradability and providing sustainable solutions to support technical innovation. This study aimed to determine the characterization and physicochemical properties of Phaseolus vulgaris fibers (PVF) by Thermo gravimetric analysis (TGA)/DTG, X-Ray Diffraction analysis (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). Eventually, fourier transform analysis and XRD analysis of PVFs demonstrated the presence of cellulose with a crystallinity index of 43.01%. The surface morphological analysis was observed and reveals that PVFs contain rougher surfaces, which would be favourable to develop good bonding with the matrix for making composites. 摘要 从植物各部分新的天然纤维特性已成为纺织行业，汽车行业越来越受欢 迎，不仅、电器、建筑等行业，但在各种工业应用中，由于其灵活的特 性，可用性、可降解性和支持技术创新提供可持续的解决方案。本研究的 目的是确定菜豆纤维的特性和理化性质 (PVF) 通过热重分析、差热分析 (TGA/DTG)、X射线衍射分析 (XRD) 、傅里叶变换红外光谱 (FTIR) 和扫描电子 显微镜 (SEM) 。最终，傅里叶变换分析和X射线衍射分析证明存在与PVFS的 纤维素的结晶度指数43.01%。观察其表面形态分析和揭示，菜豆纤维中含 有粗糙的表面，这将有利于培养良好的粘结基质复合材料。

Owing to the continuous development towards the miniaturization of electronics, newer dielectric ... more Owing to the continuous development towards the miniaturization of electronics, newer dielectric materials were sought which would enable to achieve high energy density for many applications. To achieve a compact and reliable design of electrical equipment for the present day requirements, there is an urgent need for better and smart insulating materials and in this respect, the reported enhancements in dielectric properties obtained for polymer nanocomposites seems to be very encouraging. Such change was often favourable for engineering purpose. In this case, we obtain a high dielectric permittivity and low dielectric loss. So, it can be used in many applications like electrical insulation for power apparatus, power cables, insulated wires and outdoor insulators too.

Fullerenes, Nanotubes and Carbon Nanostructures