Home / Journals / FDMP / Vol.9, No.1, 2013
Table of Content
  • Open Access

    ARTICLE

    An Experimental Study on Drying of Pistacia Terebinthus in a Fixed Bed Dryer

    A. Balbay1, H. Ülker2, Ö. Şahin3
    FDMP-Fluid Dynamics & Materials Processing, Vol.9, No.1, pp. 1-10, 2013, DOI:10.3970/fdmp.2013.009.001
    Abstract In this study, drying behaviours of the outer shell peeled Bittim (Pistacia terebinthus) with initial moisture content of 42.2% (dry basis (d.b)) was investigated in a novel fixed bed drying system. The drying experiments were performed at different temperatures (40 °C, 60 °C and 80 °C), air velocities (0.5 m/s and 1 m/s) and weights (30 g and 40 g). A constant rate period was not observed in the drying of bittims; all the drying process occurred in falling rate period. Three models in literature were selected to fit the experimental data. The fit quality of models was evaluated using… More >

  • Open Access

    ARTICLE

    An Alternative Approach to Minimize the Convection in Growing a Large Diameter Single Bulk Crystal of Si0.25Ge0.75 Alloy in a Vertical Bridgman Furnace

    M. M. Shemirani1, M. Z. Saghir2
    FDMP-Fluid Dynamics & Materials Processing, Vol.9, No.1, pp. 11-21, 2013, DOI:10.3970/fdmp.2013.009.011
    Abstract Producing homogeneous single bulk crystals requires a good understanding of the thermo-solutal behavior in the solvent region. This study explores simulation of the growth of large diameter single bulk crystals of silicon and germanium alloy from its melt utilizing Bridgman method. Both thermal and solutal diffusion of silicon and germanium in the molten SiGe alloy are of interest. It was observed that the diffusion dominates the transport phenomenon in the solvent region especially in the first 25 mm of the model due to having a PeT <<1. It was also found that the control of both radial and axial applied… More >

  • Open Access

    ARTICLE

    CFD Simulation of Magnetohydrodynamic Flow of a Liquid- Metal Galinstan Fluid in Circular Pipes

    E. Gedik1, H.Kurt2, Z.Recebli1
    FDMP-Fluid Dynamics & Materials Processing, Vol.9, No.1, pp. 23-33, 2013, DOI:10.3970/fdmp.2013.009.023
    Abstract In this paper, the steady, laminar, incompressible viscous flow of an electrically conducting liquid-metal fluid is investigated numerically in a circular non-conducting pipe. The considered work fluid is Galinstan (GaInSn, i.e. Gallium-Indium-Tin). Such a liquid metal is subjected to a constant pressure gradient along the axial direction and a uniform transverse magnetic field in the spanwise direction. Numerical simulations are performed by means of the Fluent commercial software (used to solve the governing three dimensional fluid dynamics and electromagnetic field partial differential equations iteratively). The magnetic field induction, B, takes values between 0 and 1.5 T with a 0.5 T… More >

  • Open Access

    ARTICLE

    Heat Transfer and Entropy Analysis for Mixed Convection in a Discretely Heated Porous Square Cavity

    A. Maougal1, R. Bessaïh2
    FDMP-Fluid Dynamics & Materials Processing, Vol.9, No.1, pp. 35-59, 2013, DOI:10.3970/fdmp.2013.009.035
    Abstract The present study is a numerical investigation of the irreversibility and heat transfer properties of a steady laminar mixed flow in a square cavity, filled with a saturated porous medium and heated by a discrete set of heat sources. The continuity, Navier-Stokes, energy and entropy generation equations have been solved by a finite volume method. Both heat transfer irreversibility and fluid friction irreversibility have been taken into account in the computations of entropy generation. Simulations have bee carried out for Reynolds number Re=20, 40, 80, 100, 200, Darcy number, Da=10-5-10-1, Prandtl number, Pr=0.015, 0.7, 10, 103, and aspect ratio, D/H… More >

  • Open Access

    ARTICLE

    Effects of the Velocity and the Nature of the Inert Gas on the Stainless Steel Laser Cut Quality

    S. Aggoune1, E.H. Amara1, M. Debiane2
    FDMP-Fluid Dynamics & Materials Processing, Vol.9, No.1, pp. 61-75, 2013, DOI:10.3970/fdmp.2013.009.061
    Abstract The effects of inert assisting gas nature and velocity on laser cut quality are investigated. A pure fusion cutting process just above melting point is considered, where the molten steel velocity is given as a function of the two acting forces represented by the pressure gradient and the frictional forces applied by the laminar gas flow. In the case of nitrogen assisting gas, the stainless steel melt film exhibits a visible separation point. The point where the melt flow is separated out from the solid wall depends strongly on the gas velocity. It is pushed down the cut surface when… More >

  • Open Access

    ARTICLE

    Experimental Investigation of Internal Channel Cooling Via Jet Impingement

    Emad Elnajjar1, Mohammad O. Hamdan, Yousef Haik
    FDMP-Fluid Dynamics & Materials Processing, Vol.9, No.1, pp. 77-89, 2013, DOI:10.3970/fdmp.2013.009.077
    Abstract In this paper, two heat transfer configurations (central-jet and side-jet) of jet impinging on a semicircular surface are experimentally studied. The internal channel is formed using flat insulated wall and a semi-circular surface using a curved flexible heater with a uniform heat flux. A set of experiments have been performed for the purpose of assessing the heat augmentation and pressure drop between the two jet configurations. The measurements include the inlet and outlet flow temperatures using thermocouples, the temperature map of the flexible heater using thermal infra-red camera, the flow rates using rotary meter and pressure drop using pressure transducer.… More >

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