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  • 1
    Electronic Resource
    Electronic Resource
    The effect of polymer additives on laminar separation (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 267-273 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tests were conducted with dilute polymer solutions in a water tunnel. Subcritical flows over a circular cylinder were tested. The effects of free-stream turbulence and polymer additives on the development of laminar boundary layers and separation were examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857442
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The temporal evolution of a pair of streamwise vortices (1995)
    Springer
    Experiments in fluids 19 (1995), S. 241-249 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A detailed investigation of the velocity and vorticity fields of a pair of vortices growing over a 75°-sweep delta wing is carried out through LDV measurements of three components of velocity and vorticity. Data are obtained along one of the vortices. The wing is undergoing a ramp-like pitch-up motion. The evolution of the flow field in four planes normal to the free-stream velocity is captured at 100 time instants through the wing motion. The delta wing is pitched through angles of attack ranging from 28° to 68°. From the velocity data at each incidence, the corresponding vorticity field is calculated. Hysteresis effects on vortex development and breakdown are studied through axial velocity and vorticity contours. The topologies of streamlines and vortex lines are compared with the corresponding topologies of the steady case. It is found that vortex breakdown can be detected first by a drastic reduction of the axial velocity. This phenomenon is developing in a non-axisymmetric fashion, beginning at the inboard side of the vortex. This is followed by a reduction of the axial vorticity component and finally by a reversal of the azimuthal vorticity component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196472
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The dynamic character of the hemisphere-cylinder wake (1999)
    Springer
    Experiments in fluids 26 (1999), S. 415-422 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The dynamic character of the hemisphere-cylinder wake was studied over the entire range of angles of attack, i.e. α=0° to 90°. The work was carried out in two wind tunnel facilities, using hot-wire anemometry. Velocity auto- and cross-spectra in the wake reveal that the leeward vortices exhibit periodic motions, with multiple dominant frequencies for 24°〈α〈42°, one single dominant frequency for 15°〈α〈22°, while no periodic activity is detected for α〈15°. In the regime 15°〈α〈42°, a new periodic heaving motion of the vortices is documented. Vortex heaving transitions to the more classical vortex shedding periodicity in the neighborhood of α=45°. Above α=55°, vortex shedding occurred at a single Strouhal number of 0.15. The limiting case α=90° was investigated in detail for semi-infinite and finite hemisphere-cylinder models and comparisons were made to axisymmetric bodies with different nose shapes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003480050305
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Unsteady heat convection over circular cylinders (1987)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 33 (1987), S. 19-25 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Numerical calculations of the velocity and temperature fields were conducted for unsteady flows over a single circular cylinder and a bundle of cylinders. Periodic disturbances, natural or externally imposed, were considered. Periodic and averaged heat transfer rates were examined. Results compare favorably with experimental data. Calculations were carried out to predict heat transfer rates in regimes of unsteady flows that have not been tested experimentally.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690330104
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Finite-element analysis of fluid flow and heat transfer for staggered bundles of cylinders in cross flow (1987)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 7 (1987), S. 1325-1342 
    Details
    ISSN: 0271-2091
    Keywords: Convective Heat Transfer ; Finite Elements ; Navier-Stokes Equations ; Numerical Results ; Penalty Model ; Staggered Cylinders ; 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 two-dimensional Navier-Stokes equations and the energy equation governing steady laminar incompressible flow are solved by a penalty finite-element model for flow across finite depth, five-row deep, staggered bundles of cylinders. Pitch to diameter ratios of 1·5 and 2·0 are considered for cylinders in equilateral triangular and square arrangements. Reynolds numbers studied range from 100 to 400, and a Prandtl number of 0·7 is used. Velocity vector fields, streamline patterns, vorticity, pressure and temperature contours, local and average Nusselt numbers, pressure and shear stress distributions around the cylinder walls and drag coefficients are presented. The results obtained agree well with available experimental and numerical data.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650071204
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    Paper (German National Licenses)
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