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  • 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 More >

  • Open Access

    ARTICLE

    Flow Characteristics of Revolving Ferrofluid with Variable Viscosity in a Porous Medium in the Presence of Stationary Disk

    Paras Ram1, Anupam Bhandari2

    FDMP-Fluid Dynamics & Materials Processing, Vol.8, No.4, pp. 437-452, 2012, DOI:10.3970/fdmp.2012.008.437

    Abstract The present problem is formulated by considering the dynamics of a ferromagnetic fluid of variable viscosity permeating a porous medium in a rotating system in the presence of a stationary boundary. The fluid at large distance from such a boundary (disk) is assumed to rotate at a given uniform angular velocity. The viscosity of the fluid is assumed to depend on the intensity of the applied magnetic field. The governing nonlinear partial differential equations are transformed into a set of coupled nonlinear ordinary differential equations resorting to a similarity transformation. The resulting system of equations More >

  • Open Access

    ARTICLE

    Enhanced Heat Transfer by Unipolar Injection of Electric Charges in Differentially Heated Dielectric Liquid Layer

    Walid Hassen1, Mohamed Naceur Borjini2, Habib Ben Aissia1

    FDMP-Fluid Dynamics & Materials Processing, Vol.8, No.4, pp. 381-396, 2012, DOI:10.3970/fdmp.2012.008.381

    Abstract In this work we consider the problem related to the electro-thermo-convection of a dielectric fluid in a rectangular enclosure placed between two electrodes. This layer is subjected simultaneously to the injection of electric charges and to a thermal gradient. The influence of the electric Rayleigh number (200 - 1000) on the structure of the flow, the density of electric charge and heat transfer is investigated. An oscillatory flow is observed and discussed in detail. More >

  • Open Access

    ARTICLE

    Thermodiffusion Applications in MEMS, NEMS and Solar Cell Fabrication by Thermal Metal Doping of Semiconductors

    Morteza Eslamian1,2, M. Ziad Saghir1,3

    FDMP-Fluid Dynamics & Materials Processing, Vol.8, No.4, pp. 353-380, 2012, DOI:10.3970/fdmp.2012.008.353

    Abstract In this paper recent advances pertinent to the applications of thermodiffusion or thermomigration in the fabrication of micro and nano metal-doped semiconductor-based patterns and devices are reviewed and discussed. In thermomigration, a spot, line, or layer of a p-type dopant, such as aluminum, which is deposited on a semiconductor surface, penetrates into the semiconductor body due to the presence of a temperature gradient applied across the wafer body. The trails of p-doped regions within an n-type semiconductor, in the form of columns or walls, may be used for several applications, such as the isolation of More >

  • Open Access

    ARTICLE

    Numerical Modelling of Rib Width and Surface Radiation Effect on Natural Convection in a Vertical Vented and Divided Channel

    Nadia Dihmani1, Samir Amraqui1, Ahmed Mezrhab1,2, Najib Laraqi3

    FDMP-Fluid Dynamics & Materials Processing, Vol.8, No.3, pp. 311-322, 2012, DOI:10.3970/fdmp.2012.008.311

    Abstract Natural convection with surface radiation heat transfer is investigated numerically in a vented vertical channel heated asymmetrically. The numerical solution is obtained using a finite volume method based on the SIMPLER algorithm for the treatment of velocity-pressure coupling. Concerning the radiation exchange, in particular, the working fluid is assumed to be transparent, so that only the solid surfaces (assumed diffuse-grey) give a contribute to such exchange. The effect of Rayleigh numbers and rib width (for Pr=0.7 air fluid) on the heat transfer and flow structure in the channel is examined in detail. Results are presented More >

  • Open Access

    ARTICLE

    Three-Dimensional Numerical Simulation of Air Cooling of Electronic Components in a Vertical Channel

    Y. Amirouche1, R. Bessaïh2

    FDMP-Fluid Dynamics & Materials Processing, Vol.8, No.3, pp. 295-310, 2012, DOI:10.3970/fdmp.2012.008.295

    Abstract This paper summarizes a series of computational results originating from the simulation of three-dimensional turbulent natural convection occurring in a vertical channel containing 5 cubic aluminum heated sources (mimicking a set of electronics components equally spaced in the vertical direction). A three-dimensional, conjugate heat transfer model with appropriate boundary conditions is used. In particular, the governing equations are solved by a finite volume method throughout the entire physical domain. Calculations are made for distinct values of: the Rayleigh number, the ratio (air/solid) of thermal conductivities and other geometrical parameters (in order to examine the influence More >

  • Open Access

    ARTICLE

    Numerical Simulation of Ice Melting Near the Density Inversion Point under Periodic Thermal Boundary Conditions

    A. Arid1, T. Kousksou1, S.Jegadheeswaran2, A. Jamil3, Y. Zeraouli1

    FDMP-Fluid Dynamics & Materials Processing, Vol.8, No.3, pp. 257-276, 2012, DOI:10.3970/fdmp.2012.008.257

    Abstract A two-dimensional numerical model has been developed to investigate the phase-change of ice near 4 °C in a rectangular cavity. The enthalpy-porosity model is reformulated in terms of conservation equations of mass, momentum and heat to account for the evolution the solid/liquid interface. Constant and time-dependent (with sinusoidal law) temperature boundary conditions are considered. Results confirm the possibility to control the typical dynamics of ice melting in a square cavity near the density inversion point by means of a wall temperature which varies in time (with given amplitude and frequency). More >

  • Open Access

    ARTICLE

    On the KP Equation with Hysteresis

    Veturia Chiroiu1, Ioan Ursu2, Ligia Munteanu3, Tudor Sireteanu4

    FDMP-Fluid Dynamics & Materials Processing, Vol.8, No.1, pp. 91-106, 2012, DOI:10.3970/fdmp.2011.008.091

    Abstract The Kadomtsev-Petviashvili (KP) equation describes the evolution of nonlinear, long waves of small amplitude with slow dependence on the transverse coordinate. The KP equation coupled with the generalized play operator is studied in this paper in order to explain the dilatonic behavior of the soliton interaction and the generation of huge waves in shallow waters. Hirota bilinear method and results from a nonlinear semigroup theory are applied to simulate the resonant soliton interactions. More >

  • Open Access

    ARTICLE

    Heat Exchange between Film Condensation and Porous Natural Convection across a Vertical Wall

    Rashed Al-Ajmi1, Mohamed Mosaad1,2

    FDMP-Fluid Dynamics & Materials Processing, Vol.8, No.1, pp. 51-68, 2012, DOI:10.3970/fdmp.2011.008.051

    Abstract Conjugate heat transfer across a vertical solid wall separating natural convection in a cold fluid-saturated porous medium and film condensation in a saturated-vapour medium is analyzed. The analysis reveals that this thermal interaction process is mainly controlled by the thermal resistance ratio of wall to porous-side natural convection and that of condensate film to natural convection. Asymptotic and numerical results of interest are obtained for the local and mean overall Nusselt number as functions of these two thermal resistance ratios. More >

  • Open Access

    ARTICLE

    Two Dimensional Numerical Simulation of Mixed Convection in a Rectangular Open Enclosure

    Md. Tofiqul Islam1, Sumon Saha2, Md. Arif Hasan Mamun3, Mohammad Ali4

    FDMP-Fluid Dynamics & Materials Processing, Vol.4, No.2, pp. 125-138, 2008, DOI:10.3970/fdmp.2008.004.125

    Abstract A numerical study has been performed on mixed convection inside an open cavity on the bottom of a channel. One of the three walls of the cavity experiences a uniform heat flux while the other walls and the top of the channel are adiabatic. Three different cases are considered by applying uniform heat flux on (a) the inflow side (assisting forced flow); (b) the outflow side (opposing forced flow); (c) the bottom horizontal surface (transverse flow). The Galerkin weighted residual method of finite element formulation is used to discretize the governing equations. For mixed convection,… More >

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