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  • 2000-2004  (1)
  • 1975-1979  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 29 (1978), S. 871-883 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Résumé Cette étude considère la convection libre à nombre de Grashof élevé au dessus d'un cylindre horizontal de section circulaire lorsqu'on augmente brusquement sa température. On présente une méthode numérique qui permet de déterminer avec précision la solution des équations instationnaires de la couche limite. Le développement des caractéristiques physiques de l'écoulement est calculé et les résultats sont comparés avec ceux qui ont été déjà obtenus analytiquement pour les petites et grandes valeurs de la variable du temps.
    Notes: Abstract The free convection on a horizontal circular cylinder whose temperature is suddenly increased is studied at large Grashof number. An accurate numerical method is described for determining the solution of the time-dependent boundary-layer equations. The development of the various physical properties of the flow are calculated and compared with their values at small and large times as obtained from the previously obtained analytical solutions.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 28 (1977), S. 289-299 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Die Arbeit behandelt das dreidimensionale Grenzschichtproblem der Strömung entlang des Inneren an einem Kegel, wobei die Strömung ausserhalb der Grenzschicht durch einen Potentialwirbel entlang der Kegelachse und durch Radialbewegung entlang der Kegel-Generatoren gebildet wird. Die Momenten-Integral-Gleichung wird mit einer Pohlhausen-Methode gelöst. Eine asymptotische Lösung der Grenzschichtgleichung wird dazu benützt, eine gewisse Willkür zu beseitigen, die gewöhnlich bei solchen Methoden auftritt, und gibt zusammen mit der Diskussion von gewissen Grenzbedingungen die Grundlage der Methode.
    Notes: Summary The paper deals with the problem of a three dimensional boundary layer flow on the inner surface of a cone when the flow external to the boundary layer is due to a potential line vortex on the axis of the cone together with a radial flow parallel to the cone generators. The momentum integral equations are solved using a Pohlhausen method. An asymptotic solution of the boundary layer equations is used to overcome the arbitrariness which commonly arises in this type of approach and, together with a discussion of certain other boundary conditions, lays a foundation for the use of the method.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The differential cross-sections for the elastic scattering of protons from12C with incident energies ranging in approximately 2 MeV steps between 20 and 50 MeV, are analyzed using a standard optical model.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-1634
    Keywords: free convection ; boundary-layer ; horizontal surface ; transient ; heat flux
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract This paper presents an analytical and numerical study of transient free convection from a horizontal surface that is embedded in a fluid-saturated porous medium. It is assumed that for time $$\bar \tau 〈 0$$ steady state velocity and temperature fields are obtained in the boundary-layer which occurs due to a uniform flux dissipation rate q 1′′ on the surface. Then, at $$\bar \tau = 0$$ the heat flux on the surface is suddenly changed to q 2′′ and maintained at this value for $$\bar \tau 〉 0$$ . Firstly, solutions which are valid for small and large $$\bar \tau $$ are obtained. The full boundary-layer equations are then integrated step-by-step for the transient regime from the initial unsteady state ( $$\bar \tau = 0$$ ) until such times at which this forward marching approach is no longer well posed. Beyond this time no valid solutions could be obtained which matched the final solution from the forward integration to the steady state profiles at large times $$\bar \tau \to \infty $$ .
    Type of Medium: Electronic Resource
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