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  • 1990-1994  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Reverse flow in channel-effect of front and rear obstructions (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 3847-3853 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The occurrence of reverse flow in a channel when a bluff body is kept at the entry is already known. In the earlier investigations, attention was focused on the generation of the reverse flow with bluff bodies, such as flat plate and other geometries, having the same width as the channel. The separation of the shear layers from the obstruction at the front end and the interaction of the shear layers at the rear end are mainly responsible for the reverse flow. To gain further insight into the phenomenon, the effects of the width of the obstruction at the front and that of placing another at the rear end in tandem with the front one are examined in this study. It is observed that the reverse flow occurs even when the width of the flat plate (b) is less than the channel width (w); the lower limit being b/w=0.6. At this b/w the reverse flow velocity is small, but it increases progressively with b/w until a maximum of about 30% of the forward velocity is attained for b/w≥2.0. However, reverse flow as high as 0.6 times the free-stream velocity is obtained when another plate is kept close to the rear end in addition to the front plate. Further increase in the reverse flow to 0.83 times the free-stream velocity has been achieved by replacing the flat plate model at the rear with a semicircular scoop. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868376
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reverse flow in channel-influence of obstruction geometry (1993)
    Springer
    Experiments in fluids 16 (1993), S. 137-145 
    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 In the present study the flow through and around a parallel walled channel with various obstruction geometries placed at the channel entry is investigated. The flow inside the channel is found to be either stagnant, reverse, or in the forward direction depending upon the position of the obstruction. Experiments were carried out with various obstruction geometries like square, triangular, circular and semi-circular to study the effect of the shape of the geometry on the reverse flow phenomenon. Of the four, the triangular geometry gave the maximum reverse flow. The square and the semi-circular gave almost the same as the flat plate. The maximum forward flow also depends upon the shape of the obstruction geometry. To study the effect of the afterbody length the rectangular shape was chosen and models of different afterbody lengths were investigated. It is seen that the shorter afterbody lengths give a higher reverse flow. The maximum forward flow velocity however is higher for larger afterbody lengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00944915
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Prediction of wake in a curved duct (1991)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 13 (1991), S. 907-916 
    Details
    ISSN: 0271-2091
    Keywords: Wake curvature ; k-ε model of turbulence ; 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: Experimental data on the development of an aerofoil wake in a curved stream are compared with calculations based on the k-ε model of turbulence with standard constants and with the model constant Cμ dependent on the local curvature. The mean velocity profile is asymmetric, the half-width of the wake is more on the inner side of the curved duct than on the outer side, and the turbulent shear stress decreases rapidly on the outer side. The standard k-ε model is able to satisfactorily reproduce this behaviour. Making Cμ dependent on the local radius improves the agreement on the inner side but slightly worsens it on the outer side.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650130708
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Computation of turbulent asymmetric wake (1993)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 16 (1993), S. 239-248 
    Details
    ISSN: 0271-2091
    Keywords: Asymmetric wake ; Turbulent flow ; k-ε model of turbulence ; 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 development of asymmetric wake behind an aerofoil in turbulent incompressible flow has been computed using finite volume scheme for solving two-dimensional Navier-Stokes equations along with the k-ε model of turbulence. The results are compared with available experimental data. It is observed that the computed shift of the point of minimum velocity with distance is sensitive to the prescribed value of the normal component of velocity at the trailing edge of the aerofoil. Making the model constant Cu as a function of streamline curvature and changing the production term in the equation for ε, has only marginal influence on the results.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650160307
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    Paper (German National Licenses)
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