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Murugesan P.,KS Rangasamy College of Technology | Mayilsamy K.,Indian Institute of Road and Transport Technology | Suresh S.,National Institute of Technology Tiruchirappalli | Srinivasan P.S.S.,Knowledge Institute of Technology
International Communications in Heat and Mass Transfer | Year: 2011

The effect of V-cut twisted tape insert on heat transfer, friction factor and thermal performance factor characteristics in a circular tube were investigated for three twist ratios (y = 2.0, 4.4 and 6.0) and three different combinations of depth and width ratios (DR = 0.34 and WR = 0.43, DR = 0.34 and WR = 0.34, DR = 0.43 and WR = 0.34). The obtained results show that the mean Nusselt number and the mean friction factor in the tube with V-cut twisted tape (VTT) increase with decreasing twist ratios (y), width ratios (WR) and increasing depth ratios (DR). Subsequently an empirical correlation also was formulated to match with experimental results with ± 6% variation for the Nusselt number and ± 10% for the friction factor. © 2010 Elsevier Ltd.


Nagarani N.,KS Rangasamy College of Technology | Mayilsamy K.,Indian Institute of Road and Transport Technology | Murugesan A.,KS Rangasamy College of Technology
Renewable and Sustainable Energy Reviews | Year: 2014

This review presents when and how extended surface with heat exchanger have been used over the last 15 years in the field of heat transfer. They have been used in this field over a century, but their utilization increases more recent. For past 1 decade, most of the industries required high performance heat transfer components with less weight, volume and cost. The reported investigations are categorized into five major groups as follows: annular fins, elliptical fins and elliptical tube, pin fins, longitudinal fins and recent trend fins by experimental, numerical and analytical methods. Around 70 published articles related to fins with heat exchanger are briefly reviewed. This information is useful for future use of the different shapes of extended surface based on the space availability and cost. © 2013 Elsevier Ltd. All rights reserved.


Anita R.,Indian Institute of Road and Transport Technology
UPB Scientific Bulletin, Series C: Electrical Engineering | Year: 2014

This paper deals with a model of Photovoltaic interface with boost converter fed four-leg VSC (Voltage Source converter) with T connected transformer for power quality enhancement. A synchronous reference frame theory is planned for three-phase four-wire Shunt Active Filter (SAF) which includes converter, inductor and capacitor. The proposed shunt active filter provides harmonic reduction, reactive power compensation and neutral current compensation at the point of common coupling (PCC). The Photovoltaic array interface with boost converter is used to build up the voltage to match the DC link constraint of the four-leg VSC. The major benefit of this proposed approach is that, it will provide regular compensation for the complete day and grid interface converter can effectively be utilize to transfer of active power produce from the renewable resource. The T connected transformer is responsible for isolation to the VSC and passageway to the zero sequence fundamental harmonics current. To obtain the reference current in order to generate the firing pulse to the SAF, the whole arrangement is planned, established and validated by using MATLAB-SIMULINK environment.


Lakshmipathy J.,Arunai Engineering College | Kulendran B.,Indian Institute of Road and Transport Technology
International Journal of Refractory Metals and Hard Materials | Year: 2014

In the present study, the reciprocating wear behavior of 7075Al/SiC composites and 6061Al/Al2O3 composites that are prepared through liquid metallurgy route is analyzed to find out the effects of weight percentage of reinforcement and load at the fixed number of strokes on a reciprocating wear testing machine. The Metal Matrix Composite (MMC) pins are prepared with different weight percentages (10, 15 and 20%) of SiC and Al 2O3 particles with size of 36 μm. Hardness of these composites increases with increase in wt.% of reinforcement. However, the impact strength decreases with increase in reinforcement content. The experimental result shows that the volume loss of MMC specimens is less than that of the matrix alloy. However, the volume loss is greater in 6061Al/Al2O 3 composites when compared to 7075Al/SiC composites. The temperature rise near the contact surface of the MMC specimens increases with increase in wt.% of reinforcement and applied load. The coefficient of friction decreases with increase in load in both cases. © 2014 Elsevier Ltd.


Murugesan P.,KS Rangasamy College of Technology | Mayilsamy K.,Indian Institute of Road and Transport Technology | Suresh S.,National Institute of Technology Tiruchirappalli
Chinese Journal of Chemical Engineering | Year: 2010

Heat transfer, friction factor and thermal enhancement factor characteristics of a double pipe heat exchanger fitted with square-cut twisted tapes (STT) and plain twisted tapes (PTT) are investigated experimentally using the water as working fluid. The tapes (STT and PTT) have three twist ratios (y = 2.0, 4.4 and 6.0) and the Reynolds number ranges from 2000 to 12000. The experimental results reveal that heat transfer rate, friction factor and thermal enhancement factor in the tube equipped with STT are significantly higher than those fitted with PTT. The additional disturbance and secondary flow in the vicinity of the tube wall generated by STT are higher compared to that induced by the PTT is referred as the reason for better performance. Over the range considered, the Nusselt number, friction factor and thermal enhancement factor in a tube with STT are respectively, 1.03 to 1.14, 1.05 to 1.25 and 1.02 to 1.06 times of those in tube with PTT. An empirical correlation is also formulated to match with experimental data of Nusselt number and friction factor for STT and PTT. © 2010 Chemical Industry and Engineering Society of China (CIESC) and Chemical Industry Press (CIP).

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