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  • 1985-1989  (4)
  • 1988  (4)
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  • 1985-1989  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Higher-order effects in natural convection flow over uniform flux inclined flat plates in porous media (1988)
    Springer
    Heat and mass transfer 22 (1988), S. 239-242 
    Details
    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 werden Grenzschichteinflüsse höherer Ordnung für die freie Konvektionsströmung über schrägen ebenen Platten (sowohl für positive als auch für negative Schräge) bei gleichmäßigem Wärmestrom in einem gesättigten porösen Medium untersucht. Mit Hilfe der Methode der angepaßten asymptotischen Entwicklungen werden drei Terme der inneren und äußeren Entwicklung bestimmt. Es wird gezeigt, daß die erste Eigenfunktion für
    Notes: Abstract Higher-order boundary-layer effects for natural convection flow along inclined flat plates (of both positive and negative inclinations) with a uniform heat flux surface condition in a saturated porous medium are studied. Using the method of matched asymptotic expansions the three terms in inner and outer expansions have been obtained. It is shown that the first eigenfunction for this considered problem coincides with 0(ɛ 2)-term in the inner expansion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01377247
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    An exact solution for non-darcy free convection from a horizontal line source of heat (1988)
    Springer
    Heat and mass transfer 22 (1988), S. 125-127 
    Details
    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 In dem Aufsatz wird die freie Konvektion von einer horizontalen, linienförmigen Wärmequelle untersucht, die in ein unbegrenztes poröses Medium eingebettet ist. Die Poren des porösen Mediums sind mit einem Fluid gefüllt, das unter Schwerkrafteinfluß ruht. Das strömende Fluid und das poröse Medium sind örtlich im thermischen Gleichgewicht.
    Notes: Abstract In this paper we consider the free convection from a horizontal line source of heat which is embedded in an unbounded porous medium saturated with a fluid at rest under gravity. The convective fluid and the porous medium are in local thermal equilibrium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01052976
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The sudden melting of a thin vertical flat plate in a Darcian free convection flow (1988)
    Springer
    Acta mechanica 71 (1988), S. 77-93 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In this paper a solution of the unsteady free convection boundary-layer equations in porous media is presented for the sudden melting of a thin semi-infinite vertical flat plate. It is assumed that fort〈0 that the steady state temperature and velocity has been obtained and at timet=0 the plate starts to melt. Three distinct phases of the temporal development of the flow are considered. An analytical solution is presented which is valid fort≪1 and which shows the initial decay of the boundary-layer. At very large values oft the boundary-layer will disappear and an analytical solution showing this approach is obtained. A numerical solution which matches these two limiting solutions has been obtained by means of a step-by-step method and these results show good agreement with the theoretical results that are valid at small and large values of time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01173939
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Two dimensional combined convection in vertical parallel plate ducts, including situations of flow reversal (1988)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 26 (1988), S. 1645-1664 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Numerical solutions are presented for the problem of steady laminar combined convection flows in vertical parallel plate ducts. Axial diffusion is neglected in the analysis and the resulting governing equations, which are of a parabolic nature, are expressed in an implicit finite difference scheme using a vorticity-stream function formulation and are solved using a marching technique. A constant wall temperature boundary condition is used and investigations are restricted to the case Pr = 0.72. A large range of values of the ratio Gr/Re is considered, -300 ≤ Gr/Re ≤ 70, and comparisons are made with the case of pure forced convection. For large values of the ratio |Gr/Re| reverse flow occurs in the duct. A modification to the standard marching technique is introduced and complete solutions are achieved for these situations for the first time. Results are presented in terms of velocity profiles, Nusselt numbers, friction factors and temperature distributions.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620260713
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    Paper (German National Licenses)
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