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RISS 인기검색어
- 검색키워드
- 저자 : M. Udayakumar (검색결과 5 건)
- 무료
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Modeling of the Manifold Configuration for Maximum Efficiency in a Hydraulic Machine
Kesar M Kothari,R.Udayakumar,Ram Karthikeyan,Vishweshwar S,Nikitha Raj 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.1
Hydraulic manifolds are metal cuboids machined to realize the compact circuit layout within them. They are introduced in the hydraulic machines to fit the large and complex hydraulic system layouts in narrow spaces available in the machines. Therefore, designing of the manifold in fact is more oriented towards achieving minimum size and weight. But the use of manifold, may introduce high pressure losses in the system. Efficiency of the system decreases and temperature of the fluid increases with pressure drop. This present research work focuses on understanding the pressure losses in the most common channel connections used in the manifold to realize the hydraulic circuit and to understand the efficiency of the manifold at different flow values. To achieve these objectives, a real-time case study is considered, where a manifold for a cable pulling winch machine is modified to reduce the pressure drop and increase the efficiency of the machine. Simple channel models are considered and analyzed using semi empirical equations available in the literature and are compared with results obtained from Computational Fluid Dynamics (CFD) analysis. Various geometric bend models are drafted in Solid Works and then exported to do the CFD software to obtain the pressure drop with different flows. The values obtained from CFD and the characteristic of the valves from the manufacturer’s catalogue are used to create the manifold in Matlab Simulink to predict the performance of the manifold at different flows. Therefore, with these results, the overall hydraulic efficiency of the winch is determined.
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Akhil G. Variar,Ramyashree M.S.,Veekshit Udayakumar Ail,Shanmuga Priya S.,Sudhakar K.,Muhammad Tahir 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
Photocatalytic CO2 reduction is a rapidly evolving sustainable approach for CO2 reduction and renewablefuel production. The photocatalytic conversion efficiency of CO2 depends on many operational aspects. This review focuses on some of the important operational and intrinsic parameters that significantlyinfluence CO2 photocatalytic reduction efficiency. The critical parameters studied are temperature, pH,pressure, catalyst size, catalytic doping, reaction time, reaction time, feed ratio, reducing agents, type ofsolvent, the wavelength of the light source, light intensity, and effect of direct solar radiation. Thetemperature directly impacts photocatalytic reduction. Similarly, the effect of pressure was systemati-cally discussed. The morphology of photocatalysts and their effects on CO2 reduction efficiency andproducts selectivity are also deliberated. The review also focuses on a detailed assessment of the role ofphotoreactor design with the various photocatalytic reactor, their geometry, operating mode and phases. The reaction pathways for specific products are discussed based on several characterization techniques. Hence, this work gives a deeper understanding of the influential operational parameters affecting CO2photoreduction and provides new directions on optimizing them to enhance the photoreductionefficiency of CO2 to renewable fuels.
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Heat transfer characteristics in latent heat storage system using paraffin wax
Stella P. Jesumathy,M. Udayakumar,S. Suresh 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.3
An energy storage system has been designed to study the heat transfer characteristics of paraffin wax during melting and solidification processes in a vertical annulus energy storage system. In the experimental study, three important issues are focused. The first one is temperature distribution in the phase change material (PCM) during the phase change processes. The second one is the thermal characteristics of the paraffin wax, which includes total melting and total solidification times, the nature of heat transfer phenomena in melted and solidified PCM and the effect of Reynolds number as inlet heat transfer fluid (HTF) conditions on the heat transfer parameters. The final one is to calculate heat transfer coefficient and effectiveness during solidification process. The experimental results proved that the PCM melts and solidifies congruently, and the melting front moved from the top to the bottom of the PCM container whereas the solidification front moved from bottom to the top along the axial distances in the PCM container. Experiment has been performed for different water flow rates at constant inlet temperature of heat transfer fluid for recovery and use of heat. Time- based variations of the temperature distributions were explained from the results of observations of melting and solidification curves. Charging and discharging processes were carried out. Heat transfer characteristics were studied.
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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.
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Sujitha D.,Kumar H. G. Jalendra,Thapliayal Garima,Pal Garima,Vanitha P. A.,Uttarkar Akshay,Patil Mahesh,Reddy B. H. Rajashekar,Niranjan Vidya,Rayalcheruvu Usha,Govind Geetha,Udayakumar M.,Vemanna Ramu 한국식물생명공학회 2023 Plant biotechnology reports Vol.17 No.6
Reactive oxygen species (ROS) increases under stress and damages cellular processes leading to decrease in productivity. Many genes have been known to be involved in scavenging ROS. We report the identification of master regulators of oxidative stress responsive genes from contrasting rice genotypes. Using microarray analysis, we identified 52 differentially expressed transcription factors (TFs) from the contrasting rice genotypes under oxidative stress. Upregulation of these TFs induces the expression of many genes in resistant or sensitive genotypes. The promoters of these TFs are enriched with reactive oxygen species binding elements (ROSE). The promoter analysis of genes that respond to oxidative stress also revealed that these TF binding sites were present and that these genes expressed differently in contrasting rice genotypes. The transcript levels of TFs correlate with expression level of stress responsive genes coding for various pathways such as polyol, ABA, JA biosynthesis and signaling. Functional validation of HSF-C1a using virus-induced gene silencing (VIGS), showed reduced expression of its target genes. Our study demonstrates that identified TFs could act as major transcriptional regulators of oxidative stress tolerance. These TFs can be used as markers and are potential candidates to improve stress tolerance in plants.
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