Informatics Publishing Limited

Ram Subbiah ¹, R. Rajavel ²

Affiliations
1 Mechanical Engineering, Singhania University, Rajasthan, IN
2 Manipal University, IN

Abstract

Austenitic stainless steel is widely used for its resistance to corrosion but certain industrial applications require improved wear characteristics. Of various surface hardening techniques, nitriding as a low temperature treatment gives a good dimensional stability. Stainless steel has a good corrosion resistance, where they possess a low hardness, wear resistance. By case hardening the stainless steel, the hardness can be increased. Surface hardness can be increased by diffusion of carbon or nascent nitrogen. The salt bath nitriding is done at 450-5400°C for four different specimens and plasma nitriding is done at 500-5400°C for two different specimens. Nitriding is done in which hard complex nitrides are formed which improves the surface hardness. Non treated austenitic stainless steel specimen was used as a reference material. Wear test were also carried out for comparision. The layers were characterized by optical microscope, scanning electron microscope. Wear test were conducted to characterize the tribological wear behaviour.

Keywords

Wear, Low Hardness, Wear Resistance, Gas & Plasma Nitriding

Full Text

     

A. R. Sivaram ¹, G. Kanimozhivendhan ², R. Rajavel ¹, V. P. Durai Raj ³

Affiliations
1 Department of Mechanical Engineering, AMET University, Chennai - 603112, Tamilnadu, IN
2 Department of Mechanical Engineering, Regional Centre of Anna University, Tirunelveli - 627007, Tamilnadu, IN
3 Department of Mechanical Engineering, Bharath University, Chennai - 600073, Tamilnadu, IN

Abstract

Magneto hydro dynamics power generation is a non-conventional energy resource used in modern systems. Due to high demand of coal, it is necessary to search for other alternative heat source to drive the magneto hydrodynamics power plants. The liquid metal like alumi-num, manganese, copper and silver can be employed due their improved thermal conductivity and flow characteristics. The magneto hydro dynamics power generation process needs high temperature heat source for converting the inert gas into ionized plasma. A regenerative heat exchanger is employed for heat transfer between melted metal from source chamber to argon gas chamber. The heat transfer coefficient between the liquid metal flow and inert gas is high according to flow conducting material. This work deals with the inert gas plasma which is produced from liquid aluminium and this can be used for recycling. This system proves only 36% of aluminum is required than that of regular MHD system using coal as a heating source.

Keywords

Ionization, Liquid Metal Phase Change, Magnetic Field Strength, Magneto Hydrodynamics, Power Density

Full Text

   

N. Jayakumar ¹, S. Mohanamurugan ², R. Rajavel ², J. Ashok Kumar ²

Affiliations
1 Department of Mechanical Engineering, AMET University, Chennai - 603112, Tamil Nadu, IN
2 Department of Automobile Engineering, Saveetha University, Chennai - 600072, Tamil Nadu, IN

Abstract

Residual stress in weldments is one of the major concerns in manufacturing industries especially in welding. They occur, sometimes during the initial processing of metals and sometimes during rolling, forging, casting etc. In welding these stresses develop due to non uniform cooling of the welded zone. Tensile stresses are primarily responsible for crack initiation and product failure. Residual stress may also lead to premature failure of the welded joints when subjected to hazardous conditions. There are various physical methods of detection of residual stress in weldments such as x-ray diffraction and deep hole drilling. Nevertheless, numerical method is also one of the most popular methods among researchers to solve various complex engineering problems. In this work, numerical simulation is carried out by creating a 2-D model of the Austenitic stainless steel weldment with various boundary conditions using ANSYS 15.0 software and the results are studied. The details of residual stress are explained with relevance to failure occurrence.

Keywords

Finite Element Method, Residual Stress, Stainless Steel, Weldment

Full Text

   

S. Satheesh Kumar ¹, A. R. Sivaram ², R. Rajavel ²

Affiliations
1 Department of Mechanical Engineering, Sree Sowdambika College of Engineering, Aruppukottai - 626112, Tamil Nadu, IN
2 Department of Mechanical Engineering, AMET University, Chennai - 603112, Tamil Nadu, IN

Abstract

This investigation thermodynamically analyzes a cascade refrigeration system which uses an eco-friendly refrigerant R744/R290 mixture in the circuit with lower temperature as a working fluid. It has zero ODP. Condensing temperature, evaporating temperature, and cascade temperature difference with and without the effect of superheating and subcooling of both circuits are the operating parameters and design parameters considered in this investigation. In the present study, thermodynamic analysis of an eco-friendly alternative new refrigerant (mixture of R744 and R290) was proposed and performed with five refrigerants such as R407c, R408a, R410a, R404a, and R417a, which are in the higher temperature circuits of a cascade refrigeration system. MAT-LAB software was performed in terms of temperature in evaporator, temperature in condenser and difference in cascade temperature to develop an expression mathematically for excellent COP, most favorable evaporating temperature of R744/R290 mixture and most favorable mass flow ratio of high temperature refrigerant to that R744/R290 mixture.

Keywords

Binary Mixture, Cascade Refrigeration System, COP, Carbon dioxide, Propane, Theoretical Analysis

Full Text

   

A. R. Sivaram ¹, K. Karuppasamy ², R. Rajavel ¹, B. Arun Prasad ³

Affiliations
1 Department of Mechanical Engineering, AMET University, Chennai - 603112, Tamil Nadu, IN
2 Department of Mechanical Engineering, Regional Centre of Anna University, Tirunelveli - 627007, Tamil Nadu, IN
3 Department of Mechanical Engineering, Bharath University, Chennai - 600073, Tamil Nadu, IN

Abstract

Energy is one of the basic requirements for the existence and development of human life. The focus is now shifting to energy conservation due to the problems associated with conventional energy sources. This project introduces a novel water heater product that can achieve the multi-functions with improved energy performance. This paper deals with experimental investigations on the performance of a water heater, which uses waste heat from a 1.5 tonne air conditioner. Thus incorporation of a water heater in the outdoor unit of a split-type air-conditioner would result in simultaneous room space cooling and water heating. The experimental results showed that the water heater is capable of producing 88 litres of hot water in one hour of time with a temperature of 52°C. It is seen that up to 37°C of hot water temperature, COP of the waste heat recovery system is more than the COP of conventional air conditioner. But after 37°C, with the increase in hot water temperature, the COP of the waste heat recovery system decreases and becomes less than the COP of conventional air conditioner.

Keywords

COP, Waste Heat Recovery, Water Heater, 1.5 Tonne Air Conditioner.

Full Text

   

Bindu Sree Koduru ¹, Akshay R. Shinde ¹, P. Jaya Preeti ¹, K. Pavan Kumar ¹, R. Rajavel ¹, T. Sivakumar ¹

Affiliations
1 Department of Chemistry, Nandha College of Pharmacy and Research Institute, Erode-638052, Tamil Nadu, IN

Abstract

The compounds of different Pyrazoline derivatives were synthesized by cyclization of substituted chalcone derivatives in presence of hydrazine hydrate (a-e). All the synthesized compounds were characterized by spectral analysis (IR, MS and NMR). The REMA (Resazurin Microtiter Assay) plate method was used for anti-tuberculosis activity. The minimum inhibitory concentration (MIC) of the newly synthesized compound was tested against Mycobacterium tuberculosis H₃₇R_V. The Analgesic activity was performed by Acetic acid induced method. The Anti-inflammatory activity was performed by Carrageenan induced paw edema method.

Keywords

Chalcone, Hydrazine Hydrate, Pyrazoline Derivatives, Characterization, Anti-Tuberculosis Activity.

Full Text

     

P. Jayaseelan ¹, S. Prasad ¹, R. Rajavel ¹

Affiliations
1 Department of Chemistry, Periyar University, Salem-11, Tamil Nadu, IN

Abstract

The tetradentate Schiff base ligand was prepared by condensation of 2-aminobenzaldehyde with o-phenylenediamine. The synthesized complex has been studied by using cyclic voltammetry and DNA cleavage studies. The resulting voltammogram consists of a single quasi-reversible one electron transfer attribute to couple [Cu(II)L]/[Cu(I)L]. Trends in cathodic peak potential (Epc) values are observed which can be correlated with electron effects of Schiff base ligand, changes with basis of liquid groups are determinant for electrochemical trends. The interaction of Cu(II) complex with Calf Thymus DNA has been studied by using absorption, viscosity and cyclic voltammetry. Cyclic voltammetry studies reveal that the complex prefer to bind to DNA in Cu(II) rather than (I) oxidation state.

Keywords

Schiff Base, Copper(II), 2-Aminobenzaldehyde, Voltammetry, DNA Cleavage Studies.

Full Text

     

Ismail ¹, R. Rajavel ¹, M. Ganesh ¹, M. Jagadeeswaran ¹, K. Srinivasan ¹, J. Valarmathi ¹, T. Sivakumar ¹

Affiliations
1 Nandha College of Pharmacy, Division of Pharmaceutical Analysis, Koorapalayam Pirivu, Erode-638052, Tamil Nadu, IN

Abstract

A simple, precise, accurate and rapid HPLC method has been developed, and validated for the determination of Aspirin, Atorvastatin and Pioglitazone simultaneously, in combined dosage form. Acetonitrile and phosphate buffer with pH 3.5 (40%:60% v/v) is used as the mobile phase, 261nm is the detection wavelength for this study. The applicability of the method for simultaneous determination of Aspirin, Atorvastatin and Pioglitazone was verified by the determination of these compounds in marketed tablets. Results of the analysis were validated statistically, and by recovery studies (98.29-101.12%). The recovery and RSD values within the limits given in ICH guide lines method developments indicates that the suitability of proposed methods for the routine determination of these compounds in tablets. The validation parameters: linearity (r>0.996), sensitivity (LOD (1.5-0.7×10^-4 mg ml^-1 and LOQ%x10^-4-1.05×10^-4), accuracy (recoveries:98.29-101.12%)and reproducibility were found to satisfactory. The proposed method can be successfully used to determine the drug contents of marketed formulation.

Keywords

RP-HPLC, Aspirin, Pioglitazone, Atorvastatin.

Full Text