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M. Dev Anand ¹, G. Glan Devadhas ², N. Prabhu ³, T. Karthikeyan ⁴

Affiliations
1 Department of Mechanical Engineering, Noorul Islam Centre for Higher Education, Kumaracoil - 629 180, Thuckalay, Kanyakumari District, Tamil Nadu, IN
2 Department of Electronics and Instrumentation Engineering, Noorul Islam University, Kumaracoil - 629 180, Thuckalay, Kanyakumari District, Tamil Nadu, IN
3 Department of Mechanical Engineering, Kottayam Institute of Technology and Science (KITS), Chengalam East, Pallickathodu, Kottayam - 686585, Kerala, IN
4 Department of Mechanical Engineering, Saveetha Nagar, Thandalam, Chennai - 602105, Tamil Nadu, IN

Abstract

A ceramic monolith heat exchanger has been learnt for finding out heat transfer performance and effectiveness on computing numerically and ξ-NTU method. In entire domain computation numerically has been performed along with fluid region in rectangular ducts of exhaust gas side, ceramic core and rectangular duct fluid region in air side with the air exhaust in direction of cross flow. Additionally, the heat exchanger has been examined for estimating the functionality via ξ-NTU technique that is conventional along numerous Nusselt number links for rectangular duct flow for the literature. Based on the research, it has been performed on the ceramic heat exchangers and on the ceramic materials and the demand in utilizing the ceramic materials in heat exchangers. Then the recuperator is modeled by using GAMBIT and it is analyzed using FLUENT. The effectiveness and the heat transfer rate are also calculated. Then those outcomes have been assessed along the experimental data. By comparison of both functionality by computing numerically and the ξ-NTU technique, the efficiency by ξ-TU technique has been identified to be nearest to product by the numerical computation among the associative of 2.15% when Stephan's Nusselt number association has been adapted to the ξ-NTU technique within numerous connections. The total heat transfer and effectiveness by ξ-NTU method relative errors utilizing five Nusselt number correlations from literature have been lesser than 14.5% comparative to numerical computation. Associated to Nusselt number correlations, the entire heat transfer utilizing ξ-NTU technique with Stephan's correlation is highly nearest to numerical computation. For that reason, the exit temperature by ξ-NTU method with Stephan's correlation simulates within 1.2% of the relative error for exhaust exist temperature and 0.45% for the air exit temperature assessed against the numerical computation. Overall heat transfer coefficient's relative errors by ξ-NTU technique utilizing five Nusselt number correlations for the literature have been more than 17.5% to that on computing numerically.

Keywords

Ceramic Recuperators, Cross Flow, Effectiveness, Heat Transfer, Pressure Drop

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G. Glan Devadhas ¹, M. Dev Anand ², D. M. Mary Synthia Regis Prabha ³

Affiliations
1 Department of Electronics and Instrumentation Engineering, Noorul Islam University, Kanyakumari – 629180, Tamil Nadu, IN
2 Deputy Director Academic Affairs, Department of Mechanical Engineering, Noorul Islam Centre for Higher Education, Kumaracoil – 629180, Thuckalay, Tamil Nadu State, IN
3 Department of Electrical and Electronics Engineering, Noorul Islam University,Kanyakumari – 629180, Tamil Nadu

Abstract

Background/Objectives: Emissions of toxic substances are the major occupational and environmental problem associated with Electric Discharge Machining (EDM) process which is the highly extensively utilized nontraditional production process whereas these emissions could lead to unfavorable health issues to the operators and possess the straight forward impact towards the environment. Emissions of aerosols and gases are influenced by the temperature in the spark location which is a function of process parameters. This work aims at the characterization of hydrocarbons generated from the EDM process, in which kerosene is used as dielectric, for varying process parameters. Methods/Statistical Analysis: The experiment was designed using Taguchi L9 orthogonal array to study the influence of parameters of process on exposure. Die electrical level, Peak current Pulse Duration and flushing pressure were the parameters of process taken into account in this research. Findings: The breathing zone concentrations of emissions were sampled for gases and aerosols and these samples are analyzed for hydrocarbons using gas chromatography mass spectrometry analysis. The analysis results are compared with the exposure limit values or threshold limit values specified by the standard agencies and appropriate control measures were suggested.

Keywords

Aerosols and Gases, Characterization, Electric Discharge Machining, Emissions, Threshold Limit Value

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A. Siddique Ahmed Ghias ¹, S. Vijay Ananth ¹, M. Dev Anand ², G. Glan Devadhas ³

Affiliations
1 Department of Mechanical Engineering, Agni College of Technology, Thalambur, Chennai – 603103, Tamil Nadu, IN
2 Academic Affairs, Department of Mechanical Engineering, Noorul Islam University, Kanyakumari - 629180, Tamil Nadu, IN
3 Department of Electronics and Instrumentation Engineering, Noorul Islam University, Kanyakumari - 629180, Tamil Nadu, IN

Abstract

Background/Objectives: An experimental investigation and a numerical study of characteristics of heat transfer of coil in shell heat exchanger is performed. Methods/Statistical Analysis: The effects of the change in shape of tube on the heat transfer are studied here. For this, a helical coil was designed and manufactured. The difference of this study from previous ones is that the geometry of the coil is different. Existing studies used only single stretch of helical coil but in this case there are two sets of helical coil connected by a small straight tube. The heat exchanger designed is of counter follow configuration to maximize the amount of heat transferred. In the experiment, keeping constant the flow rate of shell side, the side flow rate was kept on changing and for each tube side flow rate readings were taken for different temperatures. Wilson plots were plotted for obtaining the values of convective coefficient of heat transfer. Findings: The experimental set up was validated; the values for friction factor and Nusselt number were within agreeable limits of theoretical values. A numerical study of the heat exchanger was carried out using FLUENT. Applications/Improvements: The results obtain from FLUENT supports the value obtained from the experiment.

Keywords

Counter Flow, Friction Factor, Heat Transfer, Helical Coils, Nusselt Number

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V. Kabila ¹, G. Glan Devadhas ²

Affiliations
1 Sun College of Engineering and Technology, Nagercoil, Kanyakumari – 629852, Tamil Nadu, IN
2 Noorul Islam Centre for Higher Education, Kumaracoil, Kanyakumari – 629180, Tamil Nadu, IN

Abstract

Paper presents a parallel analysis of performance of PID (Proportional Integral and Derivative) controller and Fuzzy PID controller for control of CSTH (Continuous Stirred Tank Heater) Process. CSTH is one of the type of heater which operates at constant temperature. In Heater, a hot fluid is circulated through the jacket. Mass balance and Energy balance equations are used on the process, to develop a mathematical model. A mathematical description of Tank Heater is established and various types of controllers are implemented to it. To revise the performance of different control algorithms, using MATLAB, a simulation work is conceded to control the given process system. To analyze the response of diverse controllers, time domain specifications are used. To determine the entire knowledge about the process, A small literature survey about Tank Heater is premeditated.

Keywords

CSTH, Fuzzy Logic PID, Good Gain Method, PID Control

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