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Tin Layer as a Solid Lubricant for Cold Tube Drawing Processes
Mahesh Patil,Varinder Singh,Amit Kumar Gupta,Srinivasa Prakash Regalla,Tufan Chandra Bera,Bade Simhachalam,Krishna Srinivas 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.2
This paper reports an investigation into the deployment of a thin layer of tin as a lubricant on low carbon steel tube for tube drawing process. The layer was deposited using electro-deposition technique using a green technology of citric acid based electrolyte bath. Coating layer is characterized using SEM, EDS and 3D digital microscopy technique before and after drawing processes. Experimental trials of drawing operation were conducted and promising results were observed with respect to drawing load and surface quality. The observed drawing load is comparable to that with the conventional lubrication system thereby proving the effectiveness of the new proposed lubrication system. The use of proposed lubrication resulted in greatly improved finish as well as better corrosion resistance yielding an additional promise for better value in service life, better market potential as well as a gain on environment front as the proposed method has the potential to eliminate some after operations after drawing as the drawn tube is ready to use after drawing operation.
Mahesh Suresh Patil,서재형,이무연 대한설비공학회 2018 International Journal Of Air-Conditioning and Refr Vol.26 No.1
Thermoelectric generator (TEG) is a promising option in waste heat recovery with various advantages including nonmoving components, very low operating noise and overall high stability. However, low power generation efficiency of TEGs is still concerned for application in wider fields. The objective of the present study is to investigate the parameters affecting the performance and efficiency of segmented TEG. The physical parameters including length ratio, length-to-area ratio and thickness of conducting plate were considered. In addition, the effect of varying hot side temperature was analyzed. Performance of segmented TEG was compared based on the power generation and conversion efficiency. The results of the investigation showed that increasing Bi2Te3 length in the segmented TEG made up of Bi2Te3 and SiGe increased the maximum power generation and efficiency. As length-to-area ratio increased, the power generation decreased, however, efficiency increased slightly. In addition, as the hot side temperature increased from 150 ∘ ∘C to 650 ∘ ∘C, the power generation and efficiency both increased. Power generation and efficiency of segmented TEG increased when the conducting plate thickness was increased. The power generation and efficiency were 39.2% and 51.9% higher for TEG with asymmetrical element than TEG with symmetrical element showing that asymmetrical element would be better option for same thermoelectric element volume.
Patil, Mahesh Suresh,Cho, Chong-Pyo,Lee, Moo-Yeon Elsevier 2018 Applied thermal engineering Vol.138 No.-
<P><B>Abstract</B></P> <P>This study used a numerical method to investigate the thermal performance of a 2.0 kW burner in heating the cabin of an electric passenger vehicle. The thermal performance (including temperature distribution, velocity distribution, heat flux, burner efficiency) and fuel performance (including species variation, NOx concentration) with the fuel types, mass flow rates and the inlet temperature were investigated with a numerical simulation using the standard k-ε, RNG k-ε and realizable k-ε turbulence models. The results were validated within 8% that of experimental data obtained by the Korea Institute of Energy Research, Republic of Korea. The standard k-ε turbulence model with the eddy dissipation combustion model showed a close agreement with the experimental data, compared to the RNG k-ε and realizable k-ε turbulence models. As a result, a maximum heat flux of 2171.5 W was observed for butane at a fuel mass flow rate of 0.000057 kg/s and an air inlet temperature of 0 °C. The maximum burner efficiency of 96.7% was observed for methane at a fuel mass flow rate of 0.000030 kg/s and at an inlet air temperature of 0 °C. A minimum NOx concentration of 5.5 ppm was observed for propane at a fuel mass flow rate of 0.000030 kg/s and inlet air temperature of −20 °C. In addition, the butane fuel could be suggested to be effective for the 2.0 kW burner to heat the cabin of an electric passenger vehicle.</P> <P><B>Highlights</B></P> <P> <UL> <LI> EVs have issues on a cabin heating source under cold weather conditions. </LI> <LI> EVs suffer from a short driving range and shortage of cabin heating. </LI> <LI> Thermal performance of 2.0 kW burner for cabin heater of an electric passenger vehicle was investigated. </LI> <LI> The considered burner was investigated under various numerical conditions. </LI> <LI> Suggested burner of 2.0 kW could be used as a cabin heater of an electric passenger vehicle under cold weather conditions. </LI> </UL> </P>
Mahesh Patil,T. G. Prasad,S. V. Ramu,P. Jathish,Rohini Sreevathsa,P. Chandrashekar Reddy,M. Udayakumar 한국식물생명공학회 2014 Plant biotechnology reports Vol.8 No.2
Groundnut (Arachis hypogaea L.) is animportant oilseed crop grown in semi-arid tropics where itexperiences moisture stress at different stages of growthresulting in reduced growth and productivity. In this study,we report that the stress tolerance of groundnut can beimproved by overexpression of stress-specific transcriptionfactor through transgenic approach. In silico electronicnorthernanalysis of AtNAC2 showed increased expressionunder different abiotic stresses. The transcript levels of ahomolog of AtNAC2 gene were upregulated under differentdrought regimes in groundnut. Groundnut transgenicsoverexpressing AtNAC2 showed enhanced tolerance todrought and salinity with improved yield under waterlimitedconditions. The study demonstrates that AtNAC2 isa potential candidate gene to improve stress tolerance bytransgenic approach.
Pallavi Patil,Mahesh Endait,Swati Patil 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.4
Landfills with gas collection systems often struggle to capture fugitive emissions through the final soil cover, leading to significant environmental challenges. Considering recent major landfill fires in India, methane gas emissions have been identified as the primary cause. This research explores the potential of biochar-amended soil covers as an alternative solution to mitigate fugitive emissions. Various percentages of biochar were added to the soil collected from a landfill site in Vilholi, Maharashtra, India. Geotechnical testing assesses compaction characteristics, hydraulic conductivity, and shear strength. Amendment improves the compactioncharacteristics of soil cover. The decreased hydraulic conductivity with amendment indicates improved water retention. The interlocking between soil and biochar and the specific type of biochar influences the strength gained. The column setups containing different percentages of amended soil showed reduced emissions. The improved geotechnical properties and reduced fugitive emissions demonstrate the potential for biochar-amended soil covers to enhance landfills' stability.