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Optimization
of GTAW Pulse Parameters Affecting Residual Stress in 304
Stainless Steel Weldments -- Navneet
Arora
The
paper reports the effect of pulsing parameters on the magnitude
of welding residual stresses by using gas tungsten arc welding
on type 304 austenitic stainless steel. The problems related
to residual stresses in weldments are of major concern, as
they may modify the resistance to brittle fracture, fatigue
strength and stress corrosion cracking of a welded part or
structure. The residual stress has been determined by hole
drilling strain gauge method of ASTM standard E-837.
©
2008 The Icfai University Press. All Rights Reserved.
Design,
Fabrication, Calibration and Validation of Four-Hole Probe
for Three-Dimensional Thin Shear Layer Measurements
-- N Sitaram and S Uday Kumar
A
four-hole probe with a T-shape head is designed for three-dimensional
shear flow measurements. The probe has minimum spatial and
wall vicinity errors. The probe is made very accurately using
a jig. The probe is used in two positions at 180° apart
to measure three-dimensional flows. The probe is calibrated
in an open jet tunnel and calibration coefficients are obtained.
The calibration curves are nearly symmetric about zero yaw
angle, but asymmetric about zero pitch angle. An existing
interpolation program for five-hole probes is modified to
obtain total and static pressures and flow angles from the
probe measurements.
©
2008 The Icfai University Press. All Rights Reserved.
A
Preliminary Design Approach for 1 kW Direct Methanol Fuel
Cell System -- A Difoe, A Verma and
U K Saha
Development
and application of fuel cell technology may increase significantly
through analysis and improvement of the fuel cell system by
the arrangement and proper integration of stack and support
equipment such as pump, compressor, heat exchangers and controlling
devices. In the present paper, an active fuel delivery system
utilizing a liquid feed (methanol solution) and forced-circulation
mechanism for 1 kW Direct Methanol Fuel Cell (DMFC) system
plant design have been presented. The paper presents a preliminary
design approach for the DMFC system including balance of plant.
©
2008 The Icfai University Press. All Rights Reserved.
Theoretical
Modeling of Thickness Variation in Laser Chemical Vapor Deposition
(LCVD) Manufacturing of Flat Thin Film --
Regalla Srinivasa Prakash, Rohini B C, Maheshwar Reddy
and Souri Banerjee
A
theoretical model along with a quasi-steady state computational
technique has been proposed in this paper, for the determination
of thickness profile of TiN thin film produced by the Laser
Chemical Vapor Deposition (LCVD). The deposition of one line
of one layer has been approximated by a quasi-statically moving
laser beam wherein the laser beam traverses the whole length
by discretely moving from position to position which are sufficiently
close spaced. The heat transfer in the layer and substrate
combine has been treated as one-dimensional along the length
of the layer.
©
2008 The Icfai University Press. All Rights Reserved.
Eigen
Value Analysis of Orthotropic Laminated Plates Using Higher
Order Shear Deformation Theory --
V Hariharan and P S S Srinivasan
The
behavior of composites under dynamic loading conditions is
studied. Most of the studies are related to analytical or
semi-analytical solutions, which are limited to simple geometries
and are based on linear theory neglecting the effect of shear
deformation and rotary inertia. The vibration characteristics
of laminated composite plates obtained based on Higher Order
Shear Deformation Theories (HOSDT) are expected to provide
better solutions compared to the classical approaches applied
to the eigen value analysis of orthotropic laminated plates.
©
2008 The Icfai University Press. All Rights Reserved.
The
Role of Oxygenated Additives in Controlling the Particulate
Emission in DI Diesel Engine -- A
P Sathiyagnanam and C G Saravanan
One
of the prospective methods to reduce that emission and improve
combustion is the use of oxygenated fuel additives in diesel.
The combustion characteristics under various cycles in a diesel
engine fueled with Diethylene Glycol Dimethyl Ether (DEGDME)
and Ethylene Glycol Dimethyl Ether (EGDME) blends (1%, 2%,
3% and 4% by Volume) to diesel were investigated. The experiment
was carried out in a twin cylinder, water-cooled DI diesel
engine. The results were tabulated for the duration of combustion,
peak pressure, heat release and emissions for both diesel
fuel and oxygenated additives and compared.
©
2008 The Icfai University Press. All Rights Reserved.
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