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  • 1
    Electronic Resource
    Electronic Resource
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 13 (2003), S. 86-109 
    ISSN: 0961-5539
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The laminar mixed convection boundary-layer flow of a micropolar fluid past a horizontal circular cylinder in a stream flowing vertically upwards has been studied in both cases of a heated and cooled cylinder. The solutions for the flow and heat transfer characteristics are evaluated numerically for different parameters, such as the mixed convection parameter ?, the material parameter K (vortex viscosity parameter) and the Prandtl number Pr=1 and 6.8, respectively. It is found, as for the case of a Newtonian fluid considered for Pr=1, that heating the cylinder delays separation and can, if the cylinder is warm enough, suppress it completely. Cooling the cylinder, on the other side, brings the separation point nearer to the lower stagnation point and for sufficiently cold cylinder there will not be a boundary-layer on the cylinder. This model problem may solve industrial problems with processing of polymeric liquids, lubricants and molten plastics.
    Type of Medium: Electronic Resource
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  • 2
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    Unknown
    Boulder : Periodicals Archive Online (PAO)
    East European quarterly. 29:3 (1995:Fall) 275 
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 36 (2000), S. 375-379 
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A numerical study of the steady conjugate free convection over a vertical slender, hollow circular cylinder with the inner surface at a constant temperature and embedded in a porous medium is reported. The governing boundary layer equations for the fluid-saturated porous medium over the cylinder along with the one-dimensional heat conduction equation for the cylinder are cast into dimensionless form, by using a non-similarity transformation. The resulting non-similarity equations with their corresponding boundary conditions are solved by using the Keller box method. Emphasis is placed on the effects caused by the wall conduction parameter, p, and calculations have covered a wide range of this parameter. Heat transfer results including the temperature profiles, the interface temperature profiles and the local Nusselt number are presented.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 20 (1986), S. 33-37 
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Es wird die Grenzschichtströmung bei stationärer, freier Konvektion eines nicht-Darcyschen Fluids entlang eines isothermen, vertikalen Zylinders, der in ein gesättigtes, poröses Medium eingelagert ist, mit dem Ergun-Modell behandelt. Die partiellen Differentialgleichungen, welche die Strömung beschreiben, wurden numerisch unter Verwendung eines von Keller entwickelten, impliziten Finiten-Differenzen-Schemas gelöst. Es zeigte sich, daß der Wärmeübergang stark von der modifizierten Grashof-Zahl beeinflußt wird, welche das nicht-Darcysche Fluid und den Krümmungsparameter charakterisiert. Der Wärmeübergang am Zylinder ist höher als an einer ebenen Platte.
    Notes: Abstract The steady free convection boundary layer flow of non-Darcy fluid along an isothermal vertical cylinder embedded in a saturated porous medium using the Ergun model has been studied. The partial differential equations governing the flow have been solved numerically using an implicit finite-difference scheme developed by Keller. It is found that the heat transfer is strongly affected by the modified Grashof number which characterizes the non-Darcy fluid, and the curvature parameter. Also the heat transfer is found to be more than that of the flat plate.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 20 (1969), S. 560-563 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Summary This paper considers the unsteady laminar free convection produced by heating an infinite vertical flat plate. Analytical solutions in closed forms for the velocity and temperature profiles, when the surface temperature varies stepwise and as a power of time, are obtained for Prandtl numbers close to unity. Results are reported for several values of the Prandtl number in case of a stepwise varying plate temperature.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Meccanica 7 (1972), S. 80-86 
    ISSN: 1572-9648
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Summary The solution of unsteady forced flow against an unsteadily rotating disk is obtained when the outer flow and the angular velocity of the disk are expressed in powers series of √t. The solution is established by expanding the velocity components and the pressure in powers of small time. The extension of the obtained solutions is possible by using Zeytounian's technique. Finally, an analysis is made for the problem of the time-dependent flow due to an infinite rotating disk started accelerated from rest.
    Notes: Sommario La soluzione del flusso forzato contro un disco rotante in regime non permanente è ottenuta quando il flusso esterno e la velocità angolare del disco sono espresse in una serie di potenze √t. La soluzione è formulata esponendo la componente della velocità e la pressione in potenze di tempo piccolo. L'estensione delle soluzioni ottenute è possibile usando la tecnica di Zeytounian. Infine si fa l'analisi del flusso dipendente dal tempo dovuto a un disco rotante infinito accelerato dalla quiete.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Transport in porous media 6 (1991), S. 159-171 
    ISSN: 1573-1634
    Keywords: Convection over a hot horizontal surface ; boundary layers in porous media saturated with a gas of variable properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract Boundary-layer analysis is performed for free convection flow over a hot horizontal surface embedded in a porous medium saturated with a gas of variable properties. The variable gas properties are accounted for via the assumption that thermal conductivity and dynamic viscosity are proportional to temperature. A similarity solution is shown to exist for the case of constant surface temperature. Numerical results for the stream function, horizontal velocity, and temperature profiles within the boundary layer as well as for the mass of entrained gas, surface slip velocity, and heat transfer rate at different values of the wall-temperature parameter are presented. Asymptotic solutions for large heating are also available to support the numerical work.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Flow, turbulence and combustion 54 (1995), S. 125-136 
    ISSN: 1573-1987
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The problem of natural convection flow and heat transfer induced by a vertically oriented cone with constant surface temperature is treated in this paper. The cone is assumed to have transverse wavy configurations. The resulting boundary layer flow is described by two coupled parabolic partial differential equations. These equations are solved numerically using the Keller-box method for a sinusoidal wavy cone. The effect of sinusoidal waves on the local Nusselt number is determined and presented on graphs. The local Nusselt number is found to be lower than that of the corresponding flat cone.
    Type of Medium: Electronic Resource
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