Investigation of parameters controlling metal powder production by centrifugal atomization

Doğan, Cengiz


Investigation of the Linear Stability Problem of Electrified Jets, Inviscid Analysis
Özgen, Serkan; Uzol, Oğuz (2012-09-01)
The instability characteristics of a liquid jet discharging from a nozzle into a stagnant gas are investigated using the linear stability theory. Starting with the equations of motion for incompressible, inviscid, axisymmetric flows in cylindrical coordinates, a dispersion relation is obtained, where the amplification factor of the disturbance is related to its wave number. The parameters of the problem are the laminar velocity profile shape parameter, surface tension, fluid densities, and electrical charge...
Analysis of metal forming by using isogeometric elements
Özdoğan, Yasin; Darendeliler, Haluk; Department of Mechanical Engineering (2018)
In this thesis, a new numerical analysis method named as isogeometric analysis (IGA), based on usage of non-uniform rational basis spline (NURBS) basis functions is studied in order to examine the behavior of parts in the forming processes. NURBS is a mathematical modeling method used for representing any kind of curves, surfaces and 3-D shapes and it is widely used in computer aided design (CAD) software packages since its favorable and flexible nature makes modelling of complex geometries possible. Isogeo...
Determining surface residual stress in steel sheets after deep drawing and bulging processes
Adıgüzel, Sinem; Gür, Cemil Hakan; Karadoğan, Celalettin; Department of Metallurgical and Materials Engineering (2011)
The aim of this thesis is to investigate the effects of bulging and deep drawing processes on St4 cold rolled steel by simulation and experimental characterization. In the simulations, commercial software programs MSC Marc and Simufact.forming were used. The experimental studies cover metallographic investigations, hardness measurements, and residual stress measurements. Residual stress measurements were carried out by different non- destructive characterization methods; X-ray diffraction and Magnetic Barkh...
Investigation of multilevel inverters for d-statcom applications
Deniz, Mustafa; Ermiş, Muammer; Department of Electrical and Electronics Engineering (2009)
The most important advantages of Multilevel Inverters are the absence of a coupling transformer for medium voltage applications and low harmonic current content. In this way, relocatable and economical STATCOM systems can be realized. Complex control algorithms and the isolation problems of measurement devices and power supplies are the main challenging parts of this type of application. In this study, the design, realization, and the performance of a Voltage Source Type Cascaded Multilevel Converter Based ...
Realization of neutral state green polymeric materials
Durmuş, Asuman; Toppare, Levent Kamil; Department of Chemistry (2009)
Polymeric electrochromic materials that has as one of the three complementary colors (red, green, and blue) in the neutral form and become transparent via oxidation (or reduction), has a crucial importance towards use of these materials in electrochromic devices and displays. To reflect red or blue color in neutral state, the materials have to absorb at only one dominant wavelength. On the contrary, to have a green color, there should exist at least two simultaneous absorption bands in the red and blue regi...
Citation Formats
C. Doğan, “Investigation of parameters controlling metal powder production by centrifugal atomization,” Ph.D. - Doctoral Program, Middle East Technical University, 1989.