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Nāmakkal, India

Thamilarasu P.,AMS Engineering College | Sivakumar P.,A A Government Arts College | Karunakaran K.,Salem College
Indian Journal of Chemical Technology | Year: 2011

The adsorptive removal of Ni(II) from aqueous solution using Cajanus cajan L Milsp seed shells activated carbon (CCC) and polypyrrole coated Cajanus cajan L Milsp seed shells activated carbon (PPy/CCC) has been carried out under various experimental conditions. Quantity of Ni(II) uptake at 50 mg of activated carbon is 25.75 mg/g for CCC and 29.60 mg/g for PPy/CCC. Adsorption data are modeled with Freundlich, Langmuir and Temkin adsorption isotherms. Thermodynamics parameters, such as ΔH°, ΔS°, and ΔG° have been calculated and the findings indicate that the adsorption is spontaneous and endothermic. Enthalpy change values range from 8.90 kJ/mol to 23.04 kJ/mol, and based on these values the adsorption of Ni(II) by CCC could be a physisorption. A mechanism involving intra particle diffusion and surface adsorption has been proposed for the adsorption of Ni(II) onto the adsorbent. Adsorbent used in this study is also characterized by FT-IR and SEM before and after the adsorption of metal ions. Source

Thamilarasu P.,AMS Engineering College | Karunakaran K.,Salem College
Canadian Journal of Chemical Engineering | Year: 2013

A study on the removal of hexavalent chromium ions from aqueous solution by using activated carbon prepared from Ricinus communis has been done. In this process, it was carbonised and activated by treating with concentrated sulphuric acid followed by heating for 5h at 500°C. Batch adsorption experiments are also carried out as a function of pH, contact time, initial concentration of the adsorbate, adsorbent dosage and temperature. The experimental data are fitted well to the Freundlich adsorption isotherm. Thermodynamic parameters such as ΔH°, ΔS° and ΔG° are calculated, which indicated that the adsorption is spontaneous and endothermic in nature. Adsorbent used in this study is characterised by FT-IR and SEM before and after the adsorption of Cr(VI). © 2011 Canadian Society for Chemical Engineering. Source

Karunakaran K.,Salem College | Thamilarasu P.,AMS Engineering College
International Journal of ChemTech Research | Year: 2010

The objective of this study is to assess the removal of Fe(III) from aqueous solutions onto activated carbons prepared from Ricinus Communis Seed Shell. The effects of various parameters have been investigated by the following batch adsorption technique. The various variables studied include initial concentration of the adsorbate, agitation time, adsorbent dosage, pH, kinetics, influence of co-ions and temperature. The experimental data was fit well to the Freundlich isotherm. Thermodynamic parameters such as ΔH°, ΔS°, and ΔG° were calculated, indicating that the adsorption was spontaneous and exothermic nature. FT-IR and SEM patterns of the before and after adsorbent were recorded to get better sight into the mechanism of adsorption process. Source

Ramesh N.,Easwari Engineering College | Sanker Ram B.V.,JNTUHCEH | Subrahmanyam V.,RMK Engineering College | Muralikrishna R.,AMS Engineering College
IET Conference Publications | Year: 2011

Present power systems have become complex and heavily loaded, due to which voltage instability has become a serious problem, leading to Voltage Instability a cause of system collapse from which the system cannot recover. Real and Reactive power compensation in transmission systems improve the voltage stability of the AC system and can avoid voltage collapse. Maximum power transfer capability is achieved when the UPFC is operated at its rated capacity and conventional voltage and line-flow set point regulation is no longer possible. A dispatch strategy is proposed for a UPFC operating at rated capacity in which the power circulation between the shunt and series converters is used as the parameter to optimize the power transfer. In this paper voltage stability L-index and three line stability indices have been discussed and are illustrated with the results obtained on a standard IEE 5 Test Bus system. Also by incorporating UPFC in the power flow control, the impact of this device on voltage/line stability indices is investigated under simulated conditions on IEEE 5 Test Bus system. Source

Makesh M.,Paavai Engineering College | Palanisamy P.,AMS Engineering College | Devakumaran K.,Bharat Heavy Electricals Ltd.
International Journal of Mechanical and Mechatronics Engineering | Year: 2014

Hot corrosion is serious problems in aircraft, marine, industrial, and land-base gas turbines. It is because of the usage of wide range of fuels coupled with increased operating temperatures, which leads to the degradation of turbine engines. Hot corrosion studies were conducted on both coated and uncoated specimen in air and salt (Na2SO4-60% V2O5) at 900°C under cyclic conditions for 50 cycles. An each cycle of one hour heating at 900°C followed by 20 minutes of cooling in air.Yttria-Stabilised Zirconia (YSZ) coatings were deposited on T-92 boiler steel weldments. The present paper describes fuzzy logic simulation of an experimental study on thebehavior of hot corrosion in molten salt (Na2SO4-60% V2O5) of steel-T92 coated Yttria-Stabilised Zirconia. This YSZ coatings increase the resistance to corrosion substantially which can be attributed to formation of zirconium oxides (ZrO2) and yttrium oxide (Y2O3). This coating was more significant in salt environment and there is an additional phase of ZrS. The parabolic rate constants (Kp) calculated showthat the corrosion rate is minimum at 800°C compared to other temperatures. Theexperimental results, the fuzzy logic model, and the statistical results showed goodcorrelations.The fuzzy logicmodels are developed using Matlab toolbox functions. © December 2014 IJENS. Source

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