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S. S. Sehgal,Krishnan Murugesan,S. K. Mohapatra 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.9
Microchannels based heat sinks are considered as potential thermal management solution for electronic devices. The overall thermal performance of a microchannel heat sink depends on the flow characteristics within microchannels as well as within the inlet and outlet plenum and these flow phenomena are influenced by channel aspect ratio, plenum aspect ratio and flow arrangements at the inlet and outlet plenums. In the present research work an experimental investigation has been carried out to understand how the heat transfer and pressure drop attributes vary with different plenum aspect ratio and channel aspect ratio under different flow arrangements. For this purpose microchannel test pieces with two channel aspect ratios, 4.72 and 7.57 and three plenum aspect ratios, 2.5, 3.0 and 3.75 have been tested under three flow arrangements, namely U-, S- and P-types. Test runs were performed by maintaining three constant heat inputs,125 W, 225 W and 375 W in the range 224.3 ≤ Re ≤ 1121.7. Reduction in channel width (increase in aspect ratio, defined as depth to width of channel) in the present case has shown about 126 to 165% increase in Nusselt number, whereas increase in plenum length (reduction in plenum aspect ratio defined as width to length of plenum) has resulted in 18 to 26% increase in Nusselt number.
N. Pugazhenthiran,S. Murugesan,H. Valdés,M. Selvaraj,P. Sathishkumar,P.G. Smirniotis,S. Anandan,R.V. Mangalaraja 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
In this study, 250 nm sized porous anatase TiO2 nanospheres (TiO2 NSPs) composed of 10 nm sized anataseTiO2 nanoparticles are obtained through a green synthetic route and their surfaces have been decoratedwith 3–4 nm sized plasmonic silver nanoparticles (AgNPs). Photoluminescence studies confirm thatthe AgNPs presence on TiO2 NSPs surface effectively inhibits the radiative charge recombination and thusfacilitates charge separation process at the Ag-TiO2 NSPs interface, causing an enhanced photocatalyticactivity. About 92% of the ceftiofur sodium (CFS) antibiotic taken initially is oxidized by Ag-TiO2 NSPsupon 90 min white light irradiation, while Ag loaded Degussa P25 TiO2 nanoparticles effects only 71%CFS oxidation. The synergistic effect given by plasmonic AgNPs and the continuous framework of anataseTiO2 NPs contributes to inhibit the electron-hole recombination in the Ag-TiO2 NSPs. Oxidation productsof CFS in different water sources and their eco-toxicity effects identified through LC-MS and microtoxbioassays,respectively, indicate that the obtained oxidation products are non-toxic compared to pureCFS. Therefore, porous Ag-TiO2 NSPs could be successfully applied in photocatalytic oxidation technologies,exploiting sunlight for the effective removal of pharmaceutical pollutants from wastewater.
( S. Rengaraj ),( Seung-hyeon Moon ),( Banumathi Arabindoo ),( V. Murugesan ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.1
Rubber and palm seed coats, a waste generated in the agricultural sectors, have been converted into a low cost adsorbents. The products so obtained have been characterized and used for the removal of phenol from water and wastewater. Investigations include the effect of pH, adsorbent dosage, contact time and concentration of adsorbate on the uptake of phenol from water and wastewater at 27±1℃. Adsorption equilibrium was reached with ill 4 hours for 10 - 60 mg dm<sup>-3</sup> concentration of phenol. Kinetics of adsorption of phenol onto rubber and palm seed coat follows film diffusion process. The percent removal was more than 95% over the pH range from 4 - 9 at a phenol concentration of 25 mg dm<sup>-3</sup>. The adsorption data follow Freundlich model. Column experiments have also been performed with a view to recover phenols and have in-situ chemical regeneration of the spent carbon. The studies showed that rubber and palm seed coat activated carbon can be used as an efficient adsorbent material for the treatment of phenolics from water and resin manufacturing industry wastewater.
Murugesan, K.,Nam, I.H.,Kim, Y.M.,Chang, Y.S. IPC Science and Technology Press ; Elsevier Scienc 2007 Enzyme and microbial technology Vol.40 No.7
Dye decolorizing potential of the white rot fungus Ganoderma lucidum KMK2 was demonstrated for recalcitrant textile dyes. G. lucidum produced laccase as the dominant lignolytic enzyme during solid state fermentation (SSF) of wheat bran (WB), a natural lignocellulosic substrate. Crude enzyme shows excellent decolorization activity to anthraquinone dye Remazol Brilliant Blue R (RBBR) without redox mediator whereas diazo dye Remazol Black-5 (RB-5) requires a redox mediator. Polyacrylamide gel electrophoresis (PAGE) of crude enzyme confirms that the laccase enzyme was the major enzyme involved in decolorization of either dyes. Native and SDS-PAGE indicates that the presence of single laccase with molecular weight of 43kDa. N-Hydroxybenzotriazole (HBT) at a concentration of 1mM was found as the best redox mediator. RB-5 (50mgl<SUP>-l</SUP>) was decolorized by 62% and 77.4% within 1 and 2h, respectively by the crude laccase (25Uml<SUP>-1</SUP>). RBBR (50mgl<SUP>-l</SUP>) was decolorized by 90% within 20h, however, it was more efficient in presence of HBT showing 92% decolorization within 2h. Crude laccase showed high thermostability and maximum decolorization activity at 60<SUP>o</SUP>C and pH 4.0. The decolorization was completely inhibited by the laccase inhibitor sodium azide (0.5mM). Enzyme inactivation method is a good method which averts the undesirable color formation in the reaction mixture after decolorization. High thermostability and efficient decolorization suggest that this crude enzyme could be effectively used to decolorize the synthetic dyes from effluents.
Effect of Mg/Co on the properties of CdS thin films deposited by spray pyrolysis technique
R. Murugesan,S. Sivakumar,K. Karthik,P. Anandan,M. Haris 한국물리학회 2019 Current Applied Physics Vol.19 No.10
Mg, Co doped and (Mg, Co) co-doped CdS thin films were prepared using chemical spray pyrolysis method. It is observed from the X-ray diffraction study that the deposited film exhibit cubic phase of CdS with preferred orientation along the (111) plane and incorporation of Mg and Co has been confirmed form energy dispersive analysis and XPS analysis as well. The doped and codoped CdS thin films exhibit 1LO and 2LO vibrations as confirmed by Raman spectrum. The core level XPS spectra ensures the incorporation of doping elements precisely. The morphological variations due to the incorporation of Co and Mg in CdS thin films have been observed by FE-SEM. The particle sizes and crystalline nature have been revealed from HRTEM images and corresponding SAED patterns. The co-doped CdS thin films show a significant shift blue in absorption spectrum. Improved magnetic properties have been observed for the co-doped CdS thin films
DEVELOPING A LATTICE BOLTZMANN ANALYSIS CODE IN GENERALIZED COORDINATE
R. Murugesan(람키 무르게산),R.S. Myong(명노신),J.H. Park(박재현) 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.11
The final goal of our work is to develop a Lattice Boltzmann Method (LBM) analysis code for generalized coordinate system. As a first step, in this paper the developed code is validated/verified for well-known benchmark problems such as a 2-D lid-driven cavity flow, Couette flow, Poiseuille flow by using Cartesian coordinates. Throughout this paper D2Q9 lattice modeling is employed. The features of boundary conditions are also discussed.
D. Mythili,R. Murugesan,S. Christian Johnson 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.4
Concrete has unique properties to make things in any shape. However, the strength of the concrete to support is weakin tension and good in compression. To improve the tension force carrying capacity, the concrete might get some fibrousmaterial as additional reinforcement in concrete. This addition can improve the load-carrying capacity, uniform stress &strain distribution to the entire cross-section, good bonding of ingredients, etc. This research paper deals with glass andbasalt fiber in mono and hybrid form in M30-grade concrete. The glass and basalt fiber of 1.5% volume fraction possessesgood behaviour in mechanical properties tests in mono form. When it is hybridization, 0.75% of each fibers combination hasgood strength in mechanical properties. The compressive strength has been increased up to 11%, tensile strength capacityhas been increased up to 12.5% and the modulus of rupture has been increased by about 17.4% due to the hybridization offibers. Similarly, the static load proves the specimen with fibers has a better resistance against the applied load and has lessdeflection corresponding to the ultimate load. The stress-strain behaviour obeys Hook law. The durability behaviour of theconcrete specimen also has been improved. The performance assessments taken into account for the hybrid fibre reinforcedconcrete mixes are as follows: modulus of rupture, flexural behaviour of beams, split tensile strength, acid, sulphate, andchloride attack resistance. These parameters assess the mechanical and durability properties of the concrete mixes.
Kavitha Sri A.,Deeksha P.,Deepika G.,Nishanthini J.,Hikku G.S.,Antinate Shilpa S.,Jeyasubramanian K.,Murugesan R. 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-
In this report, the insights for mimicking the natural phenomenon found in lotus leaves i.e. super-hydrophobic surface are compiled. Recently, there are reports that critically evaluated the application ofthis nature inspired property to many artificial substrates like metals, plastics, fabrics, paper, etc. Fromthe summarized reports, it is evident that the two important prerequisites for fabricating super-hydrophobic surfaces are necessary nano/micron scale topographical roughness and subsequentmodification by the low surface energy compounds. Detailed description about the water repellentnature, rolling-off properties of the water droplet with the nano/micro engineered surfaces in terms ofWenzel and Cassie-Baxter models are explored. Extending this application in the biotechnologicalfield asimplants is an innovative thought since employing the non-wettable character in the implants surfacecan eliminate many drawbacks. More thoughts and insights have been focused on developing super-hydrophobicity over bio-materials to reduce bacterial biofilm formation to overcome the drawback ofbiomaterial associated infections. The possible mechanisms behind the biofilm formation and how thesuper-hydrophobic surface can effectively mitigate the bacterial adhesion are also covered in detail.