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RISS 인기검색어
- 검색키워드
- 저자 : M.R. Thansekhar (검색결과 3 건)
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M. Satheeshkumar,M.R. Thansekhar,R. Pandiyarajan 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.6
The increasing need for development in microelectronics and systems has naturally led to pursuit of modern advancementsin the field of cooling technology. Microchannels offer excellent high temperature heat management in electronic systems. Microchannels utilize fluids capable of transferring heat energy released by the operating circuits by fluid flow. The fluid flowand nature of fluid are highly resonant on the performance of the microchannel heat sinks. The present work is a novelapproach of an investigation of three-dimensional ceramic based nanofluids flow performance in a fabricated wavymicrochannel heat sink with varying inlet header geometry. The coolant nanofluids investigated are concentrated with silicondioxide (SiO2) and aluminum oxide (Al2O3) ceramic nanoparticles with varying volume percentages and their hydraulic andthermal performance were investigated. Experimental evaluations were performed to determine variations in local Nusseltnumber and axial coefficient of heat transfer for SiO2 and Al2O3 nanoparticles concentration. Computational fluid analysis wasperformed to evaluate transport equations to determine pressure drop, friction factor and Nusselt number of the fluid flow. It was observed that increasing heat flux amplitude causes rise of local maxima of Nusselt number with corresponding decreaseof the local minima. The decrease of local minima was more profound than increase of local maxima. The different inlet headergeometries influence the local Nusselt number with conical frustum header producing the value followed by semi-circular,rectangular and triangular inlet section geometries. The observed Nusselt number and heat transfer rate was highest in caseof Al2O3 followed by SiO2 and distilled water as coolant fluids for the heat sink. Higher Nusselt number was observed forconical frustum and semi-circular inlet header geometries when SiO2 and Al2O3 based coolant fluids were used. High frictionfactor was observed when the nanoparticle concentration was 0.25 volume percentage for the entire Reynolds number underinvestigation. A computational model was utilized to evaluate the drops in pressure in the wavy microchannel and determinefrictional characteristics of the nanofluids in the present work.
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R. Ashok kumar,M. R. Thansekhar 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.7
AA6101-T6 and AA1350 aluminum alloys have wide-spread applications in electrical industries, especially in bus bar conductors. Hence, joining of these two alloys is inevitable. Main invention of friction stir welding is joining lightweight structures. We investigated the impact of number of passes and changes in location of tool from retreating side to advancing side on the welding properties of AA6101-T6 and AA1350 alloys. For analyzing the welding properties, tensile, bending, wear, micro hardness and microstructural tests were carried out. We found that double pass and offset distance in advancing side exhibits better welding properties, whereas single pass and offset distance in retreating side exhibit poor welding properties. From the analysis of variance (ANOVA), we also determined that offset distance is the most influencing welding parameter than the number of passes.
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S. Ramanathan,M. R. Thansekhar,P. Rajesh Kanna,Prem Gunnasegaran 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.8
The relative positions of leading edges and trailing edges of rectangular vortex generators (VG) in the winglet form play a crucial role in modifying thermal and hydraulic boundary layers thereby affecting the heat transfer augmentation and pressure drop in a sudden expansion channel having expansion ratio (ER) 2:1. A numerical simulation was carried out for solving the momentum and energy equations of a three dimensional vortex- laminar flow (Reynolds number < 190) with a finite volume method based commercial code FLUENT 16.2. Reynolds number, angle of attack and VG configuration have been considered as influential parameters affecting the thermo-hydraulic performance of the sudden expansion channel due to the combined effect of primary recirculation and secondary vortex flow. The heat transfer enhancement along with corresponding pressure drop penalty was compared for the toe-out and toe-in configurations at various Reynolds (Re) numbers and angle of attacks (β). Eventually irrespective of configurations, rectangular winglet VGs are found to have better overall performance at β = 30° and β = 45° in both toe-out and toe-in configurations due to strong secondary vortex flow.
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