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    Experimental and numerical investigation of effect of particle size on particle distribution in particulate metal matrix composites
    (ELSEVIER SCIENCE INC, 2006) Mat, Mahmut D.; Aldas, Kemal
    The effect of particle size on particle distribution during the casting of particulate metal matrix composites (PMMC) is experimentally and numerically investigated. Pb20% Sit alloy and Zr2O3 particles are employed as matrix and reinforcing materials respectively. The casting is performed with an inert gas pressure. The final product is sectioned at several locations and particle fraction is determined using image processing software. Particle fraction is numerically determined by following trajectories of selected particles. It is found that particle fraction decreases along the mold and segregation is reduced with larger particles. The numerical results agree reasonable with experimental data. (c) 2005 Elsevier Inc. All rights reserved.
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    Numerical and experimental investigation of two-phase flow in an electrochemical cell
    (PERGAMON-ELSEVIER SCIENCE LTD, 2008) Aldas, Kemal; Pehlivanoglu, Nur; Mat, Mahmut D.
    in this study, a two-phase mathematical model is adapted to study void fraction distribution, flow field and characteristics of electrolysis process. The model involves transport equations for both liquid and gaseous phases. An experimental set-up is established to collect data to validate and improve the mathematical model. The void fraction is determined from measurement of resistivity changes in the system due to the presence of bubbles. it is observed that there is a good agreement between the numerical results and the experimental data. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.