Yazar "Ilegbusi O.J." seçeneğine göre listele

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    Application of a bubble-induced turbulence model to subcooled boiling in a vertical pipe
    (ASME, Fairfield, NJ, United States, 1999) Mat M.D.; Kaplan Y.; Ilegbusi O.J.
    Subcooled boiling of water in a vertical pipe is numerically investigated. The mathematical model involves solution of transport equations for vapor and liquid phase separately. Turbulence model considers the turbulence production and dissipation by the motion of the bubbles. The radial and axial void fractions, temperature and velocity profiles in the pipe are calculated. The estimated results are compared to experimental data available in the literature. It is found that while present study satisfactorily agrees with experimental data in the literature, it improves the prediction at lower void fractions.
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    Prediction of phase segregation during mold filling of semi-solid slurries
    (ASME, Fairfield, NJ, United States, 1999) Mat M.D.; Ilegbusi O.J.
    Phase segregation during the mold filling of semi-solid slurry (Sn-15%Pb) is numerically investigated under non-isothermal conditions. The effects of operating parameters on the phase segregation including inlet velocity, initial solid fraction, heat transfer rate, mold geometry are considered. The semi-solid slurry is considered a non-Newtonian fluid below a critical solid fraction (fcr) and a viscoplastic medium saturated with liquid phase above the critical solid fraction. A group of particles are introduced at the mold inlet and phase segregation is studied by following the trajectories of these particles. The sharp property change at the slurry air interface is resolved with Van Leer numerical method. It is found that phase segregation is significantly affected by processing parameter. The segregation decreases with high inlet velocity, low heat transfer rate from the mold wall and cylindrical mold geometry.