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  • 1
    Electronic Resource
    Electronic Resource
    Some influences of particle shape on drag and heat transfer (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 2110-2118 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A study has been carried out on some of the influences of particle shape and orientation on the drag, lift, and heat transfer characteristics of nonspherical particles at intermediate Reynolds numbers, 10≤Re≤66. The geometry that has been employed in the investigation has been an ellipsoid of revolution with variation in angle of attack, and the aspect ratio (ratio of the major to the minor axis) has been varied by a factor of 3. The method of solution consists of a second-order, finite volume formulation of the Navier–Stokes equations, which is capable of being extended to time-dependent and variable density low Mach number flows. For relatively small increases in the ratio of major to minor axis the behavior of the pressure and skin friction distributions becomes substantially different in both qualitative and quantitative ways. The skin friction distribution as well as the heat flux to the particle surface exhibit a maxima near the major axis of the ellipsoid regardless of orientation, and the total friction drag and the total particle heat transfer exhibit a strong correlation. The total drag coefficient and the lift coefficient behave in a much different manner and they are strongly influenced by the Reynolds number, aspect ratio, and angle of attack. It appears that the total drag and lift force depend strongly on the particle shape, and it appears difficult to develop simple correlation schemes. The numerical methods that have been used performed well and they will be extended to more complex problems in the future.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857797
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Boundary-layer separation from a smooth slip surface (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 1360-1366 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Numerical results are presented for the streaming motion of an incompressible Newtonian fluid past axisymmetric ellipsoids of fixed shape, subject to the condition of zero tangential stress on the body surface. It is demonstrated that a substantial, closed-streamline wake appears behind the ellipsoid at moderate Reynolds numbers, O(20–50), when the ellipsoid is sufficiently nonspherical, and that this wake initially increases in size with increase of Reynolds number but then eventually decreases in size and disappears when the Reynolds number is sufficiently large, O(200–250) in our cases. The existence of streaming flow past a smooth, slip surface without separation is consistent with predictions from laminar boundary-layer theory. It is concluded that the recirculating wake that appears behind moderately deformed bubbles is strictly a finite Reynolds number phenomenon that cannot be predicted (or understood) via a boundary-layer analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865701
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Diamond growth using remote methane injection in a direct current arcjet chemical vapor deposition reactor (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2487-2489 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A significant enhancement in the quality of diamond films grown using a remote CH4 carbon source was observed in a direct current arcjet chemical vapor deposition reactor. The linewidths of the diamond peak at 1332 cm−1 in the Raman spectra from these films were reduced from 9.0 to 6.5 cm−1 with no reduction in mass deposition rate as compared to films grown using premixed reactor gas feeds. For diamond growth conditions, the percentage of the reactor feed carbon reaching the substrate was measured to be ∼35%. The enhanced quality of the films is attributed to reduced residence times of the carbon source in the plasma, which would limit the gas phase chemistry from proceeding beyond CH3 formation before the gas reaches the substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110457
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  • 4
    Electronic Resource
    Electronic Resource
    Deformation and solidification of droplets generated by a piezo-electric transducer (1995)
    Springer
    Journal of materials science 14 (1995), S. 185-187 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318250
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  • 5
    Electronic Resource
    Electronic Resource
    Low Reynolds number hydrodynamic interaction of a solid particle with a planar wall (1989)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 9 (1989), S. 651-688 
    Details
    ISSN: 0271-2091
    Keywords: Stokes flow ; Creeping flow ; Wall Green function ; Boundary integral method ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The slow viscous flow problem of an arbitrary solid particle in motion near a planar wall is recast into a boundary integral formulation. The present formulation employs the Green function appropriate to the planar wall problem and is developed in sufficient generality to allow calculations for arbitrary particles in any base flow which satisfies Stokes equations and no-slip on the wall. The resulting integral equations are easily discretized and solved for the particle surface tractions. Calculations are performed for axisymmetric motions of a variety of ellipso˛ids near the planar wall. Agreement with existing theory is excellent.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650090603
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