Qualification: 
M.E
d_senthilkumar@cb.amrita.edu

Senthilkumar D. currently serves as Assistant Professor at the department of Mechanical Engineering, School of Engineering, Coimbatore Campus. Senthilkumar joined Amrita in the year 2008. He received his B. E. in Mechanical Engineering from Bharthidasan University and M. E. in Thermal Engineering from Annamalai University. Currently, he is pursuing his Doctoral degree in Amrita Vishwa Vidyapeetham.

He is interested in teaching as well as in research. He has published research papers in international journals and conferences. He has guided several M. Tech. and B. Tech. projects. His research interest includes Internal Combustion Engines, Alternate fuels, Engine testing. Senthilkumar is a Life Member of Indian Society for Technical Education (ISTE) and a member of Society of Automotive Engineers (SAE).

Teaching

  • Heat Power Engineering
  • Engineering Thermodynamics
  • Fluid Mechanics and machinery.
  • Heat Transfer
  • Mechanical science
  • Instrumentation and Control system
  • Engineering Graphics

Work Experience

Year Affiliation
January 2011 - Present Assistant Professor (Senior Grade), Department Of Mechanical Engineering
Amrita Vishwa Vidyapeetham
June 2008 - December 31, 2010. Assistant Professor, Department Of Mechanical Engineering
Amrita Vishwa Vidyapeetham
July 2004 - April 2008 Lecturer, Department of Mechanical Engineering
Muthayammal Engineering College, Namakkal

Publications

Publication Type: Journal Article

Year of Publication Title

2019

S. Balasubramaniam and Senthilkumar D., “Numerical analysis of exhaust gas braking system to maximize the back pressure”, IOP Conference Series: Materials Science and Engineering, vol. 577, no. 1, p. 012133, 2019.[Abstract]


The excessive load on foundation brakes are shared by exhaust brakes during downhill performance of trucks. The exhaust brake increases the life of foundation brakes and also provides assistance to the foundation brake, especially during downhill operation. In this work, the position of the exhaust flow flap have been optimized accordingly to increase the back pressure generated in the diesel engines manufactured at Tata Cummins Ltd., India. The exhaust valve lift with respect to crank angle is modified for exhaust brake module to facilitate back pressure inside engine cylinder. A 1-D GT-POWER six cylinder engine model is modelled to replicate conditions at the inlet of the exhaust circuit. CFD simulations are carried out for various exhaust flow flap positions in order to maximize the back pressure required at engine cylinder. The position of the exhaust flow flap is crucial in resulting back pressure as the exhaust elbow geometry have sharp bends and diverging cross section. The exhaust flow flap is always placed normal to the plane of exhaust elbow. Numerical simulations are performed for various position from the turbo fan. High absolute pressure is observed, when exhaust flow flap is moved closer to the turbo fan. The high absolute pressure at exhaust manifold inlet is observed at 27mm from the turbo fan.

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2019

S. Sandeep, Senthilkumar D., Krishnan, S., and Pandey, S. K., “Assessment of atomized water injection in the intake manifold of a heavy duty diesel engine for NOx reduction potential”, IOP Conference Series: Materials Science and Engineering, vol. 577, p. 012186, 2019.[Abstract]


Diesel engines, since many years, have found their own market with their robustness, low manufacturing cost and high efficiency. Although diesel engines have so many advantages, they are being blamed for their high pollutant emissions. Main pollutants from diesel engine are NOx, CO, CO2, HC and PM. Out of these pollutants, CO, CO2, HC, and PM can be reduced using some after treatment system in the tail pipe. But NOx needs to be addressed within the cylinder which would reduce the cost of after treatment system. Since NOx formation is the function of high combustion temperature, this temperature should be reduced by some means. In this study, atomized water injection system was employed to reduce in-cylinder combustion temperature there by reducing NOx formation. Here, water was injected into the air-intake pipe along with the EGR stream. 1-D simulation model of the study engine was created using AVL BOOST. Three full load operating points were considered and simulations were performed for 2.8mg, 4mg and 6mg of water injection at each operating points. Performance and emission parameters were then validated with the test data. Results showed that increase in water injection quantity reduces NOx emission but increases the smoke value. 2.8mg of water injection was chosen to be optimum, which reduces about 90°C of in-cylinder temperature, 8-10% of NOx reduction and increases smoke by about 20% from base value.

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2019

Senthilkumar D., Dr. Thirumalini S., and Praveen, H. S. S. K., “Experimental investigation to improve performance and emission characteristics of a diesel engine by using n-butanol as additive to the biodiesel-diesel blends”, IOP Conference Series: Materials Science and Engineering, vol. 577, no. 1, p. 012102, 2019.[Abstract]


Fossil fuels are non-renewable resources and are limited in supply. The combustion of these fuels produces environmental pollution with the release of dangerous gases like Nitrogen oxides, Carbon monoxide and Carbonaceous soot. In this sense, fuel like biodiesel produced from vegetable oils can be considered as a better alternative to the fossil fuels. For this study, waste cooking oil biodiesel is used. In this work, the effect of addition of n-butanol on the performance and emission characteristics of diesel engine running at the speed of 2300 rpm is investigated. The biodiesel is prepared by transesterification process using KOH as catalyst. n-Butanol is added to B20 blend in varying volume percentages of 5, 10 and 15 to evaluate its effect on performance and emission characteristics. It is observed that BU15 possesses better performance characteristics among n-butanol blends compared to B20 with an average decrease of 18% in BSFC and increase of 21% in BTE at high loads. The experimental results showed that NOx and CO2 emissions were further reduced by 19% and 28% respectively with the addition of butanol. There has been reduction in smoke emissions by 4.7% but an increase of 22% in HC emissions for n-butanol blends.

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2019

Senthilkumar D. and Dr. Thirumalini S., “Investigation on Effect of Split Injection and Retarded Injection Timing on the Performance Characteristics of engines with Cashew nut shell biodiesel Blends”, Journal of Ambient Energy (Under Review), 2019.

2018

R. Harsh, Srivastav, H., Balakrishnan, P., Saini, V., Senthilkumar D., Rajni, K. S., and Dr. Thirumalini S., “Study of Heat Transfer Characteristics of Nanofluids in an Automotive Radiator”, IOP Conference Series: Materials Science and Engineering, vol. 310, no. 1, p. 012117, 2018.[Abstract]


This paper presents an experimental study on heat transfer using nanofluid as coolants in engines. Previous studies shows that Al 2 O 3 is found to be more effective in heat transfer due to its high conductive property which is found to increase with concentration. Particles having diameter in the range 10 -3 to 10 -6 m have low thermal conductivities and cause clogging in the flow section along with significant friction and are highly unstable in solution. Nanoparticles on the other hand are easily dispersed and cause minimal clogging or friction in the flow. In the present work, ethylene glycol-water solution is taken as a base fluid for nanoparticle dispersion. The ratio of water to ethylene glycol used is 80:20 and it has been noted out that heat conduction improved with increasing fraction of ethylene glycol. The experiments were conducted with flow rate of 4,5,6 and 7 L/min and the air flow rate inside the duct was kept constant at 4.9 m/s. The temperature of water in the reservoir is kept at 70°C. The nanoparticles used in this experiment are Cu and TiO 2 having particle size less than 80nm. Result shows that there is an improvement of 24.5% in the overall heat transfer coefficient and there was also an increase of 13.9% in the heat transfer rate compared to the base fluid (80:20 Water: EG solution).

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2018

R. Sunny and Senthilkumar D., “Investigation on Nano Particulate Aerosol at Idling Conditions of Vehicles”, IOP Conference Series: Materials Science and Engineering, vol. 390, no. 1, 2018.[Abstract]


In general, Engine will emit more particulate tailpipe emissions during idling and acceleration conditions. This is a common phenomenon in location such as Toll Plazas which has one of the highest number of vehicle density in urban areas. Therefore the study of aerosol particulates characteristics like average particle concentration and average particle diameter in air is important. The objective of this work is to describe the process of measurement and analysis of ambient Nano Particulate Matter at a Toll Plaza in a Tier II city. A nano particulate counter was used to measure particulate samples and it was mounted at a position that best replicates human exposure to the pollutants. The measurement was carried out for duration of 20 consecutive days and the time of the measurement was planned so as to cover peak traffic time experienced at the Toll Plaza. Particulate number concentration was measured at varying vehicle densities and also at different wind speeds. The results revealed that high concentration was observed for an increase in vehicle concentration as anticipated. Also high number concentration was observed for smaller particulate size (diameter 20 to 80 μm). The relation with number concentration and wind speed was inconclusive. © Published under licence by IOP Publishing Ltd.

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2017

V. Salamon, Senthilkumar D., and Dr. Thirumalini S., “Experimental Investigation of Heat Transfer Characteristics of Automobile Radiator using TiO2-Nanofluid Coolant”, IOP Conference Series: Materials Science and Engineering, vol. 225, p. 012101, 2017.[Abstract]


The use of nanoparticle dispersed coolants in automobile radiators improves the heat transfer rate and facilitates overall reduction in size of the radiators. In this study, the heat transfer characteristics of water/propylene glycol based TiO2 nanofluid was analyzed experimentally and compared with pure water and water/propylene glycol mixture. Two different concentrations of nanofluids were prepared by adding 0.1 vol. % and 0.3 vol. % of TiO2 nanoparticles into water/propylene glycol mixture (70:30). The experiments were conducted by varying the coolant flow rate between 3 to 6 lit/min for various coolant temperatures (50°C, 60°C, 70°C, and 80°C) to understand the effect of coolant flow rate on heat transfer. The results showed that the Nusselt number of the nanofluid coolant increases with increase in flow rate. At low inlet coolant temperature the water/propylene glycol mixture showed higher heat transfer rate when compared with nanofluid coolant. However at higher operating temperature and higher coolant flow rate, 0.3 vol. % of TiO2 nanofluid enhances the heat transfer rate by 8.5% when compared to base fluids.

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2016

V. R. Varthan and Senthilkumar D., “Emission Characteristics of Turbocharged Single Cylinder Diesel Engine”, Indian Journal of Science and Technology, vol. 9, no. 17, 2016.[Abstract]


Fossil fuel reserves are depleting at an alarming rate and may become extinct in few decades. To counteract this crisis much emphasis is laid out on usage of alternate fuels. Also techniques like turbocharging are used to increase the efficiency of the IC engines thereby reducing the fuel consumption. While opting for such alternate solutions like biodiesel and turbocharging, the exhaust emissions should be checked to ensure that these solutions don't pose a threat to the environment. So in this project the change in amount of component gases in the exhaust emissions were found out in four cases which are naturally aspirated with diesel, turbocharged with diesel, naturally aspirated with biodiesel and turbocharged with biodiesel. A single cylinder motorcycle diesel engine is used in this project. Emission characteristic tests were done in the naturally aspirated engine using diesel and biodiesel as fuels. Then a turbocharger designed for this engine is fitted to it and the same tests as above were conducted. Comparison in exhaust emissions which are NOx, HC, CO and CO2 was made for the above mentioned four cases. It was found that NOx emissions has increased by the usage of biodiesel as fuel, while turbocharger has decreased the NOx levels. This is a concern to be addressed while using biodiesel as alternate fuel. Biodiesel and turbocharger both had a positive effect on HC emissions, i.e. reduced the HC emissions. The impact of biodiesel and turbocharger on CO emissions was not so significant with the former increasing the emissions and the latter decreasing it by providing more oxygen. Though CO2 is not categorised as toxic emissions like other emissions; it is important to compare the amount emitted in the different cases. Biodiesel increases the amount of less-toxic CO2 whereas turbocharger has reduced the CO2 emissions. This is because the excess oxygen provided by turbocharging is used for the formation of water vapour rather than CO2. Thus the important four emissions were compared to appreciate the effect of biodiesel and turbocharger. In future work the problem of increase in NOx by biodiesel fuel should be addressed and solution has to be formulated.

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2015

N. Tom Varghese, Senthilkumar D., and Vivek, M., “Study on Effects of Magnetization of Fuel on Diesel Engine”, International Journal of Applied Engineering Research, vol. 10, no. 17, pp. 37866-37870, 2015.[Abstract]


Of an internal combustion engine. Many advancements have been made on the conventional internal combustion engine to reduce emission and increase the performance. Fuel magnetization is one of the new technologies used in internal combustion engines for reducing emission and improving performance. In this experimental study, the effect of strength and location of magnetization is compared by using an electromagnet as the fuel magnetizer. Density, kinematic viscosity, dynamic viscosity, flash and fire point of both normal and magnetized fuel have been measured and compared. Significant change in all these measured quantities was visible. Experiments have been conducted for finding the thermal efficiency and smoke emission of vertical single cylinder diesel engine by changing the location (10cm, 20cm and 30cm away from injector) and strength (0.3T, 0.6T and 0.9T) of electromagnet. The magnetized fuel shows better results than normal diesel.

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2015

S. Prabhakar.N, Senthilkumar D., and Dr. Thirumalini S., “Analysis of Regenerator Matrix in a Gamma Type Solar Stirling Engine”, International Journal of Applied Engineering Research (IJAER), vol. 10, no. 19, 2015.

2015

Ma Arun, Senthilkumar D., and Nabriya, K. Sb, “Optimization of Twin Cylinder Naturally Aspirated Diesel Engine for CPCB II Emission Limits”, International Journal of Applied Engineering Research, vol. 10, no. 16, pp. 37176-37179, 2015.[Abstract]


For Power Generation diesel engines are predominantly being used due to higher thermal efficiency and fuel efficiency compared to petrol engines. With increase in awareness of air pollution and global warming all over the world government organisations have started announcing legislations to limit exhaust emissions for a cleaner and greener environment. In India, Central Pollution Control Board (CPCB) has proposed to introduce the next stage of stringent emission norms for engines used in Power Generation from April 2014 which are comparable to the best in the world. This research work deals with the strategies applied and experimentation details to meet the proposed CPCB Stage-II emission limits. According to CPCB II emission limits, NO<inf>x</inf>+HC emissions for a naturally aspirated diesel engines have to be reduced by 28%. Achieving this target with minimum engine modification will be a difficult task. An experimental study was conducted on a twin cylinder naturally aspirated diesel engine. Various combustion parameters like catalytic converter, direct continuousEGR, static injection timing were optimized in a cost effective manner in order to achieve CPCB II limits with sufficient margin. The experimental study indicates that, the CO emission has been decreased with 20% margin and HC+NO<inf>x</inf> emission has been decreased with 15% margin from CPCB II limits. © Research India Publications.

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Publication Type: Conference Paper

Year of Publication Title

2018

V. P. Kumar Reddy, Senthilkumar D., and Dr. Thirumalini S., “Effect of antioxidants on the performance and emission characteristics of a diesel engine fuelled by waste cooking sunflower methyl ester”, in IOP Conference Series: Materials Science and Engineering, 2018, vol. 310.[Abstract]


Biodiesel is a renewable, biodegradable fuel produced from vegetable oils and animal fats. Nonetheless, its extensive utilization is impeded by the auto-oxidation resulting in degradation of the fuel. Adding antioxidants to the biodiesel is a potential solution, but it might have an effect on the clean-burning characteristics of the fuel. This paper investigates the effect of antioxidants on the performance and emission characteristics of a diesel engine fuelled by the waste cooking sunflower methyl ester. The fuel samples tested include B10, B20, B30 and B40, among which B20 produced the best possible results. Antioxidants 2, 6-ditert-butyl-4-methylphenol (BHA) and 2(3)-tert-butyl-4-methoxy phenol (BHT) of two concentrations 1000 ppm, 2000 ppm were added to B20 to evaluate the effectiveness. B20BHA1000 had the best effect with an average decrease of 5.035%, 2.02% in brake specific fuel consumption (BSFC) and exhaust gas temperature (EGT) compared to B20. Regarding the emission characteristics it was observed that B20BHA1000 had produced an increase of 7.21%, 27.79% in NOx and smoke emissions and a decrease of 33.33% in HC emissions when compared to B20. On the whole, without any requirement of alteration in the diesel engines, B20 blends with antioxidant can be utilized as fuel. © Published under licence by IOP Publishing Ltd.

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Publication Type: Conference Proceedings

Year of Publication Title

2016

M. Abilash, Senthilkumar D., Padmanabham, G., ,, Dr. Padmanaban R., and Dr. Thirumalini S., “The effect of welding direction in CO 2 LASER - MIG hybrid welding of mild steel plates”, IOP Conference Series: Materials Science and Engineering, vol. 149. p. 012031, 2016.[Abstract]


In this paper, hybrid laser-arc welding process has been studied based on the relative position of the laser and the arc (i.e. laser-leading and arc-leading arrangement) and, the effects of welding parameters, such as the laser power, arc current, arc voltage and the welding speed on the weld bead were investigated. The study indicates that the welding direction has a significant effect on the weld bead and weld pool behaviour. The result shows that laserleading configuration shows better bead characteristics when compared to arc-leading configuration. This is because in the laser-leading case molten metal flow is inward, while in the arc-leading case the metal flow is outward leading to variation in solidification front resulting in lack of synergic effects of both processes.

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2015

M. .Abilash, Senthilkumar D., and .Sathiseelan, N., “Optimization of Welding Parameters using Plasma Arc Welding for SS316 Material”, International conference on Innovative Research Techniques in Management Aeronautical Mechanical and Electrical systems. 2015.

2015

S. Bhaskar, Katib, W. Ahmed, and Senthilkumar D., “Investigation of Phase Change Material as a Potential Replacement of EGR Cooler”, Applied Mechanics and Materials, International Conference on Mechanical and Aerospace Engineering, vol. 798. Trans Tech Publications, Rome, Italy, pp. 200-204, 2015.[Abstract]


Phase Change Materials (PCM) are used widely in passive heat storage system due to their high heat retention capacities. In the present work an attempt is made to use the PCM as an effective replacement to conventional EGR cooler. The prime advantages of using PCM as an alternative to the traditionally used EGR coolers are that, the pumping operation will no longer be a continuous process hence the power consumed by pumps would drastically reduce, so does the load on the engine and secondly there would be significant reduction in the weight of the system which would ultimately boost the fuel economy of the vehicle. The PCM candidate chosen for study is a Salt blend (59%KF+29%LiF+12%NaF). The chosen specimen's thermal performance is computed based on the duration for which the refrigerant pump remains idle. Using numerical simulation the melting period of PCM(Salt Blend) is computed and the simulation is verified by already established numerical and experimental results for a different material, Rubitherm (RT-42).

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2014

Senthilkumar D., .Ajaykrishna, R., and .Thirumalini, S., “Theoretical Analysis of Critical Design Parameters for Maximum Thermal Efficiency of Solar Stirling Engines”, International conference on Advances in Design and Manufacturing. National Institute of Technology, Tiruchirappalli, 2014.

Faculty Research Interest: