CFD-based numerical investigation of convective heat transfer in multi-channel micro-exchangers using MWCNT–water nanofluid G. Anjaneya, S. Sunil, M. B. Hanamantraygouda, N. K. Manjunatha, K. Ravikiran, C. Solaimuthu, H. Ramesha, S. Harish, B. P. Dileep, C. Durga Prasad, Aymen Adem Scientific Reports, 2026 Efficient cooling is a key factor influencing the performance of compact electronic systems, which requires advanced thermal management. Microchannel Heat Exchangers (MCHEs) are increasingly becoming popular due to their high surface area-to-volume ratio and ability to dissipate high heat flux. The current study aims to explore the performance of MCHEs using a water-based, multiwalled carbon nanotube-blended nanofluid as coolant under different channel counts and geometries. A 3D CFD model was developed in ANSYS Fluent using the finite volume method, assuming constant thermophysical properties and steady-state, laminar flow, with uniform heat flux boundary conditions. An aluminum MCHE of dimensions 45 mm × 45 mm × 7 mm was analyzed with five channel geometries (square, circular, sawtooth, cross, and curved sawtooth) at three channel counts (5, 8, and 11). Two concentrations of multi-walled carbon nanotube (MWCNT)–water nanofluid (0.1 and 0.2%) were considered. Results exhibited that the baseline configuration (Square channel, 5 channels, water as coolant) achieved a convective heat transfer coefficient of 2008.24 W/m²K, overall heat transfer coefficient (U) of 1258.75 W/m²K, and thermal effectiveness (ε) of 0.102. The optimum configuration, curved sawtooth geometry with 5 channels and 0.2% MWCNT nanofluid, yielded h = 8271 W/m²K, U = 6590 W/m²K, and ε = 0.4765. ANOVA analysis confirmed channel geometry as the most influential factor, contributing 70.6% to effectiveness and 78.2% to the overall heat transfer coefficient.
Characterisation and wear behaviour of SiC reinforced FeNiCrMo composite coating by HVOF process C. Durga Prasad, S. Kollur, M. Nusrathulla, G. Satheesh Babu, M. B. Hanamantraygouda, B. N. Prashanth, N. Nagabhushana Transactions of the Institute of Metal Finishing, 2024 ABSTRACTAnalysis of the sliding wear and microstructural characteristics of iron based composite coatings are discussed. The feedstock, which consisted of 30% SiC and 70% FeNiCrMo, was mechanically combined using a ball milling process. A steel substrate made of ASTM-SA213-T11 was then sprayed with the prepared feedstock using the High Velocity Oxy Fuel (HVOF) process. The coating and substrate were put through a sliding test using a pin-on disc tribometer while being subjected to typical loads of 10 and 20 N at 200°C and 300°C as well as ambient conditions without lubrication. The samples were subjected to microstructures and phase studies using SEM and XRD techniques. Wear characteristics including friction coefficient, volumetric material loss, and wear rates of the coating and substrate were calculated using system-produced data. The hardness and wear resistance of the coated samples were improved owing to the coating region containing hard carbide phases such as SiC and Fe2C.KEYWORDS: Iron basedFeNiCrMoSiCcomposite coatingASTM-SA213-T11 steelHVOFsliding wear AcknowledgementsThe authors are grateful to Aum Techno Spray, Bengaluru, India for providing the HVOF coating system used in this study.Disclosure statementNo potential conflict of interest was reported by the author(s).
Fatigue studies on aluminum 6061/SiC reinforcement metal matrix composites Prashant S. Humnabad, M. B. Hanamantraygouda, S. B. Halesh Journal of Mines Metals and Fuels, 2022 <p>Fatigue is a process of progressive localized plastic deformation occurring in a material subjected to cyclic stresses and strains at high stress concentration locations that may culminate in cracks or complete fracture after a sufficient number of fluctuations. Fatigue testing is carried out using the ASTM D3479 with a notch or crack for investigating the initiation of crack. Several fatigue tests were conducted in tension-tension and/or tensioncompression loading at a frequency of 10Hz or sinusoidal wave’s frequency of 5Hz, and at constant-amplitude. The fatigue tests were interrupted by the researchers at regular intervals after a predetermined number of cycles to monitor crack advance and to observe the failure modes by various ways such as visual observation, digital camera, traveling microscope, CCD camera, etc.</p>
Wear behaviour of hot forged SiC reinforced aluminium 6061Composite materials B.M. Girish, B.P. Shivakumar, M.B. Hanamantraygouda, B.M. Satish Australian Journal of Mechanical Engineering, 2022 The present work aims to investigate the effect of hot forging on the wear behaviour of aluminium alloy 6061 reinforced with silicon carbide (SiC) particles of size 25 to 30 µm. Forging of the spec...
Use of composite materials and hybrid composites in wind turbine blades Sri Sai P. Reddy, Rohan. Suresh, Hanamantraygouda. M.B., B.P. Shivakumar Materials Today Proceedings, 2021 A brief overview of the materials used in wind turbine blades is presented in the following. Wind power is one of the biggest sources of natural energy which is tapped by installing windmills in open areas of land, usually far from metropolitan areas. The biggest task involved in this, is achieving maximum efficiency with minimal cost. One way this can be achieved is by replacing the medieval wind turbine blades with hybrid composite material blades. The main advantage of this is balanced strength and stiffness. Wind turbine blades are manufactured according to certain pre-made mathematical calculations and are placed accordingly so that the blades rotate in a determined direction. The turbine blades are manufactured in different ways, some of which have been discussed further in this paper. The use of new materials such as nano-powders and hybrid fibers revolutionize the current manufacturing processes and throw open the doors to new opportunities, those which involve higher efficiencies, lower environmental impact, lesser wear, etc. Details of such materials and their properties have been discussed in this paper.
Investigation of Corrosion Behavior of SiC-Reinforced Al 6061/SiC Metal Matrix Composites Using Taguchi Technique Sadanand Sarapure, B. P. Shivakumar, M. B. Hanamantraygouda Journal of Bio and Tribo Corrosion, 2020 In the present work, the statistical investigation on corrosion behaviour of Silicon Carbide-reinforced Al6061 Aluminium metal matrix (AMMCs) composites using Taguchi technique has been reported. Stir casting technique was adopted for synthesizing Al/SiC composites containing 0%, 2%, and 4% weight percentages of SiC. The corrosion studies were carried out for test variables—wt% of SiC, normality of solution, and corrosion duration for the as-cast composite specimens. The specimens were tested in NaCl solutions of normality 1.0, 1.5, and 2 and the exposure period ranging from 40 to 80 days. Corrosion characteristics of the composites were statistically analyzed by employing the design of experiments approach using Taguchi technique. Influence of various parameters on corrosion behavior of composites were investigated by Signal-to-noise ratio and analysis of variance. Result of the research determines that greater corrosion resistance was obtainable by composites when compared to monolithic aluminium 6061 alloy in the chosen corrosion media. This phenomenon of decrease of corrosion rate with exposure time was attributed to possible passivation of matrix alloy with the formation of protective layer formed on the specimen exposed to NaCl protecting the base metal from aggressive environment. The corrosion morphology was studied by scanning electron microscopy (SEM).
Effect of SiC Particulate on Dry Sliding Wear Behaviour of Al based Forged Metal Matrix Composites B. P. Shivakumar, M. B. Hanamantraygouda, L. Prashanth, K. B. Yogesha, P. Siddappa, M. Mrityunjaya Mechanisms and Machine Science, 2019 The objective of the present work is to investigate the effect of forging on the wear behaviour of Al-SiC Metal Matrix Composite at different weight percent of SiC particles. The Al-SiC composite material is fabricated by stir casting technique at 2, 4 and 6% of weight fractions of reinforcement and the casted composites were forged for different reduction ratios of 20%, 40% and 60%. Wear tests were conducted at a constant disc rotational speed of 800 rpm for 30N, 40N and 50N load and sliding distances of 1000 m, 1500 m and 2000 m. The worn out surfaces of the composite were analyzed using optical microscope. The wear rate of the forged composite showed lower values compared to the unforged composite. Increased wt. % of SiC particles in the matrix alloy enhances the wear resistance of the composite. It is also found that, wear rate is increased with the increase of load and wear track distance for all the cases.
Effect of Cold Forging on Microstructure and MechanicalProperties of Al/SiC Composites M B Hanamantraygouda, B P Shivakumar, P N Siddappa, L Sampathkumar, L Prashanth Iop Conference Series Materials Science and Engineering, 2018 The objective of this work was to investigate the effect of cold forging on mechanical properties and microstructural study of Al MMCs, at different wt% of SiC and forging cycle. The Al-SiC composite material was fabricated by stir casting method at different weight percentage of SiC such as 2.5, 5, 7.5 and 10%. Further, the deformation characteristics during open-die forging of Al-SiC composite at cold conditions was investigated. Cast and forged composite material was subjected to hardness test, tensile test and impact test. The grain size, microstructure behaviour was investigated using optical microscope. The results show that hardness and strength of Al-SiC composite increases and ductility decreases as compared to Al alloy in both as-cast and forged conditions. Optical microscope images showed that the distribution of SiC in Al matrix was more homogeneous in a forged composite as compared to cast one and reduction of porosity was found. Further, it showed that due to forging cycle the grain size was reduced by 30% to 35% from initial size.
Machinability study of Al-TiC metal matrix composite P. N. Siddappa, B. P. Shivakumar, K. B. Yogesha, M. Mruthunjaya, M. B. Hanamantraygouda Matec Web of Conferences, 2018 Aluminum Metal Matrix Composites have emerged as an advanced class of structural materials have a combination of different, superior properties compared to an unreinforced matrix, which can result in a number of service benefits such as increased strength, higher elastic moduli, higher service temperature, low CTE, improved wear resistance, high toughness, etc. The excellent mechanical properties of these materials together with weight saving makes them very attractive for a variety of engineering applications in aerospace, automotive, electronic industries, etc. Hence, these materials provide as alternative substitutes for conventional engineering materials when specific mechanical properties necessary for required applications. In this work an attempt is made to study the machining parameters of Al6061/TiC MMC. The composite is developed by reinforcing TiC particles in varying proportions of 3, 6, 9 and 12 % weight fractions to the Al6061 matric alloy through stir casting technique. Cutting forces were measured by varying cutting speed and feed rate with constant depth of cut for different % weight fractions. The results showed that the cutting force increases with the increase of feed rate and decreases with the increase of cutting speed for all the weight fractions. Cutting parameters were optimized using Taguchi technique.
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