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  • 1
    Electronic Resource
    Electronic Resource
    Boundary-layer flow of a micropolar fluid due to a stretching wall (1997)
    Springer
    Archive of applied mechanics 67 (1997), S. 229-236 
    Details
    ISSN: 1432-0681
    Keywords: Key words polymer ; extrusion ; boundary layer ; micropolar fluid ; similarity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  A Theoretical analysis is carried out to study the boundary-layer flow over a continuously moving surface through an otherwise quiescent micropolar fluid. The transformed boundary-layer equations are solved numerically for a power-law surface velocity using the Keller-box method. The effects of the micropolar K and exponent m parameters on the velocity and microrotation field as well as on the skin-friction group are discussed in a detailed manner. It is shown that there is a near-similarity solution of this problem. The accuracy of the present solution is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004190050113
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Free Convection from a Vertical Plate in a Porous Medium Subjected to a Porous Medium Subjected to a Sudden Change in Surface Heat Flux (1997)
    Springer
    Transport in porous media 26 (1997), S. 205-224 
    Details
    ISSN: 1573-1634
    Keywords: porous medium ; convection ; boundary layer ; transient ; heat flux.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract An analysis is made of the transient free convection from a vertical flat plate which is embedded in a fluid-saturated porous medium. It is assumed that for time $$\overline \tau 〈 0$$ a steady state temperature or velocity has been obtained in the boundary-layer which occurs due to a uniform flux dissipation rate $$q_1^{\prime \prime } $$ . Then at time $$\overline \tau = 0$$ the heat flux on the plate is suddenly changed to $$q_2^{\prime \prime } $$ and maintained at this value for $$\overline \tau 〉 0$$ . An analytical solution has been obtained for the temperature/velocity field for small times in which the transport effects are confined within an inner layer adjacent to the plate. These effects cause a new steady boundary layer. A numerical solution of the full boundary-layer equations is then obtained for the whole transient from $$\overline \tau = 0$$ to the steady state, firstly by means of a step-by-step method and then by a matching technique. The transition between the two distinct solution methods is always observed to occur very near to the turning point of the plate surface temperature, a time at which the fluid temperature is close to its steady state profile. The solution obtained using the step-by-step method shows excellent agreement with the small time analytical solution. Results are presented to illustrate the occurrence of transients from both small and large increases and decreases in the levels of existing energy inputs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006550510374
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Non-Darcy natural convection from a vertical wavy surface in a porous medium (1995)
    Springer
    Transport in porous media 20 (1995), S. 223-234 
    Details
    ISSN: 1573-1634
    Keywords: Porous medium ; convection ; boundary layer ; nonsimilarity ; inertia ; surface waves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract We examine the combined effect of spatially stationary surface waves and the presence of fluid inertia on the free convection induced by a vertical heated surface embedded in a fluid-saturated porous medium. We consider the boundary-layer regime where the Darcy-Rayleigh number, Ra, is very large, and assume that the surface waves have O(1) amplitude and wavelength. The resulting boundary-layer equations are found to be nonsimilar only when the surface is nonuniform and inertia effects are present; self-similarity results when either or both effects are absent. Detailed results for the local and global rates of heat transfer are presented for a range of values of the inertia parameter and the surface wave amplitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01073173
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Natural convection from a horizontal permeable surface in a porous medium - numerical and asymptotic solutions (1996)
    Springer
    Transport in porous media 22 (1996), S. 327-344 
    Details
    ISSN: 1573-1634
    Keywords: convection ; boundary layer ; permeable surface ; similarity solutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract The equations which govern the similarity solution for free convection boundary-layer flow above a permeable, horizontal surface in a fluid-saturated porous medium are considered. These are seen to depend on the dimensionless parameters γ and m measuring mass transport rate and the wall temperature variation, respectively. Numerical solutions are presented for a wide range of values of γ and m. Asymptotic solutions are obtained for ¦γ¦ large (for both fluid injection, γ 〉 0, and fluid withdrawal, γ 〈 0) and for m large. These are compared with the numerical solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00161630
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    Paper (German National Licenses)
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