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Diffusion Modeling in TGA in Context of CO2 Gasification of Char

G. Samdani[1], S. Mahajani[1], A. Ganesh[1], P. Aghalayam[2], R. K. Sapru[3], D. K. Mathur[3]
[1]Department of Chemical Engineering, Indian Institute of Technology Bombay, Mumbai, India
[2]Indian Institute of Technology Madras, Chennai, India
[3]UCG Group, IRS, ONGC, Chankheda, Ahmadabad

The Thermo- Gravimetric Apparatus (TGA) is often used for kinetics determination. In TGA setup, gasification reaction may be limited by the reach (diffusion) of the gasification agent to the internal surfaces of the char particles. In addition to this, after some time, ash is formed between the bulk of the gas and the upper surface of char. The present modeling exercise is aimed at examining the ...

Material Selection and Computational Analysis on DOHC V16 Engine’s Mounting Bracket Using COMSOL Multiphysics

M. V. A. Nag[1]
[1]G.R.I.E.T., Hyderabad, AP, India

Reduction of the engine vibration and the dynamic forces transmitting from engine to the automotive body structure has always been an important part of automotive research. Automobile engineers face the task of creating a mechanism to absorb these vibrations and provide a smooth ride. The usage of Motor Mounts is the best solution for dampening the effects of vibrations and oscillations. This ...

Effect of Geometry of the Grooves on the Mixing of Fluids in Micro Mixer Channel

V. Ranjan[1], A. Kumar[1], G. Prakash[1], R. Mandal[1]
[1]Department of Mechanical Engineering, Indian School of Mines, Dhanbad, Jharkhand, India

Understanding the flow fields at the micro-scale is a key to develop methods of successfully mixing fluids for micro-scale applications. This paper investigates flow characteristics and mixing of three different geometries in micro-channel. A Circular groove micro mixer has been designed and simulated. One such channel is shown in Figure1. The geometry of the channels taken was rectangular with ...

Design and Analysis of Micro-Heaters for Temperature Optimization using COMSOL Multiphysics for MEMS Based Gas Sensor

V. S. Selvakumar[1], L. Sujatha[1]
[1]Rajalakhmi Engineering College, Chennai, Tamil Nadu, India

Micro-Heaters are the key components in sub-miniature micro-sensors, especially in gas sensors. The metal oxide gas sensors utilize the properties of surface adsorption to detect changes in resistance as a function of varying concentration of different gases [5]. To detect the resistive changes, the heater temperature must be in the requisite temperature range over the heater area. Hence the ...

Simulation of Magnetic Flux Distribution of Stator and Rotor Coil of Superconducting Air Cored Wind Turbine Generator using COMSOL Multiphysics

A. Hazra[1], G. Konar[1]
[1]Power Engineering Department, Jadavpur University, Kolkata, West Bengal, India

Wind energy is one of the fastest growing renewable energy sources for electricity generation over the past decade. The offshore installation of large-scale wind farms draws huge attention because of better wind profile. Direct drive synchronous wind turbine generators are now a global demand for light weight, compact, large scale wind turbine generators. Among various approaches in designing ...

Studies of Lead Free Piezo-Electric Materials Based Ultrasonic MEMS Model for Bio sensor

P. Pattanaik[1], S. K. Kamilla[1], D. P. Das[2], S. K. Pradhan[3]
[1]MEMS Design Center, Institute of Technical Education & Research (ITER), Sikhya ‘O’ Anushandhan University, Bhubaneswar, Odisha, India
[2]Process Engineering and Instrumentation Lab, Institute of Minerals and Materials Technology (IMMT), Bhubaneswar, Odisha, India
[3]Dept of ECE, Hi-Tech Institute of Technology, Khurda, Odisha, India

This paper describes the design of an ultrasonic transducer using different lead free piezo-electric materials and evaluates their performance with different glucose levels in the human blood. COMSOL Multiphysics 4.2a was used for the simulation study using 2D axis symmetric model of piezoelectric transducer which was designed with lead free piezoelectric materials such as Barium Sodium Niobate ...

Optimal Utilization of Railgun

N. R. Mahajan[1], S. B. Patel[1], Z. A. Khan[1]
[1]Department of Electrical Engineering, Indian Institute of Technology Hyderabad, Hyderabad, Andhra Pradesh, India

Railgun is an electrically-powered gun that accelerates a conductive projectile along magnetic metal rails. Various factors increase the projectile velocity. Each method has its own advantages and disadvantages. While increasing the projectile velocity, one has to keep in mind the longevity of the rail guns for practical use . Railguns are often damaged after few uses due to the extreme working ...

Coupled Electromagnetic and Heat Transfer Simulations for RF Applicator Design for Efficient Heating of Materials

C. Thiagarajan[1], J. Anto[2]
[1]ATOA Scientific Technologies Pvt Ltd, Whitefield, Bangalore, Karnataka India.
[2]Researcher

Conventional heating of material wastes energy during heating due to inherent radiation, conduction and convection based heating mechanism. Alternate efficient heating methods are actively researched for improved efficiency. Radio frequency based electromagnetic heating is increasingly used for efficient heating in place of conventional heating. This requires coupling of electromagnetic and heat ...

A Study on the Suitability of Indium Nitride for THz Plasmonics

A. Shetty[1], K. J. Vinoy[1], S. B. Krupanidhi[2]
[1]Electrical Communication Engineering, Indian Institute of Science, Bangalore, India
[2]Materials Research Centre, Indian Institute of Science, Bangalore, India

As interest in the electromagnetic spectrum expands towards the infrared and terahertz range, the distinct advantages of using semiconductors instead of metals for plasmonic applications must be understood. Plasmonic resonances in gold (Au) and indium nitride (InN) gratings are studied, in the terahertz (?=30µm) regime. The electromagnetic properties of Au and InN are described by the Drude ...

VLSI Layout Based Design Optimization of a Piezoresistive MEMS Pressure Sensors using COMSOL Multiphysics

R. Komaragiri[1], Sarath. S.[1], N. Kattabomman[1]
[1]NIT Calicut, Kozhikode, Kerala

This paper focuses on the diaphragm design and optimization of a piezoresistive Micro Electro Mechanical System (MEMS) pressure sensor by considering Very Large Scale Integration (VLSI) layout schemes. The aim of these studies is to find an optimal diaphragm shape by Finite Element Method (FEM) using COMSOL®, which is most suitable for VLSI layout. Optimal diaphragm shape is a diaphragm shape ...