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  • 1
    Electronic Resource
    Electronic Resource
    Methods of computation of suspended load from bed materials and flow parameters (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 28 (1981), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Computation of the grain-size distribution of the suspended load above a sand bed must take into consideration: (1) sorting processes from the bed to the bed layer and (2) sorting between the bed layer and suspension. Grain-size distributions of the bed layers above sand beds of three different types have been computed in this work, both by the Einstein and the Gessler methods. Using these as references, suspended load distributions have been obtained in each case by the Rouse suspension equation. A new formula has also been developed in partial modification of Hunt's method for direct computation of bed load and suspended load from a bed's grain-size distribution and flow parameters.Comparison of the computed data with actual observations in laboratory flumes show that no one method is particularly superior to the others, but the present method is advantageous because it affords direct computation of the suspended load from a bed's grain-size distribution, without going through an intermediate stage (bed load). The possible sources of error in each of the methods have been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1981.tb01942.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Unsteady convective diffusion in a pulsatile flow through a channel (1999)
    Springer
    Acta mechanica 134 (1999), S. 1-16 
    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 The paper presents an exact analysis of the streamwise dispersion of passive contaminant molecules released in an incompressible viscous fluid flowing through a channel under the influence of a periodic pressure gradient. Using the Aris-Barton method of moments which is valid for all time after the injection of the solute, the dispersion coefficients of a passive contaminant cloud are obtained separately for three different cases: steady, periodic and for comparison the combined effect of steady and periodic currents. Here it is shown how the injected material disperses due to the shear effect caused by the combined effects of flow (steady or periodic) and lateral diffusion about its mean position, and how the centre of gravity of mass moves, when the initial distribution of contaminant is uniform over the cross-section of the channel. The comparison reveals that for all cases the dispersion coefficient asymptotically reaches a stationary state after a certain time, but it changes cyclically with dispersion time even in the stationary state for the case of oscillatory flows. The analysis leads to the interesting result that the dispersion coefficient consists of a steady part and a fluctuating part due to the pulsatility of the flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01170300
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of wall conductances on hydromagnetic flow and heat transfer in a rotating channel (1977)
    Springer
    Acta mechanica 28 (1977), S. 85-99 
    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
    Description / Table of Contents: Zusammenfassung In der Arbeit wird der Einfluß der Leitfähigkeit der Wände auf die MHD-Strömung sowie auf den Wärmeübergang untersucht für den Fall, daß sich das zähe Medium zwischen zwei rotierenden Platten befindet und ein Magnetfeld parallel zur Rotationsachse angelegt wird. Es wird eine exakte Lösung des Problems gegeben. Es zeigt sich, daß die Geschwindigkeit, die Stromdichte und die Temperatur nur von der Summe der Leitfähigkeiten der Wände + φ2 = φ abhängen, dagegen hängt die magnetische Feldstärke von den individuellen Werten φ1 und φ2 ab, wobei φ1 und φ2 die Leitfähigkeiten der oberen bzw. unteren Wand bezeichnen.
    Notes: Summary Wall conductance effects on the hydromagnetic flow and heat transfer between two parallel plates in a rotating frame of reference has been studied when the liquid is permeated by a transverse magnetic field. An exact solution of the governing equations has been obtained. It is found that the velocity, current density and the temperature depend only on the sum of the wall conductances φ1 + φ2 = φ but magnetic field depends on the individual values of φ1 and φ2, where φ1 and φ2 are respectively the wall conductance ratios of the upper and lower walls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01208791
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Buoyancy effect on dispersion of a solute in a flow through a horizontal channel (1986)
    Springer
    Acta mechanica 58 (1986), S. 137-152 
    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 The paper is concerned with the statistical study of the dispersion of a cloud of solute injected into a combined free and forced convective laminar flow through a parallel plate channel under the action of a uniform linear axial temperature variation along the channel walls, including the buoyancy forces. The main idea is to study the effect of the Grashof number on the variance, skewness, and kurtosis of the distribution of concentration of the solute for all time. It is found that there is a critical Grashof number for which the distribution of concentration about the mean is exactly a Gaussian function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01176596
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  • 5
    Electronic Resource
    Electronic Resource
    Dispersion of contaminant in oscillatory flows (1988)
    Springer
    Acta mechanica 74 (1988), S. 107-122 
    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 An extension of the Aris-Barton method of moments is presented for the study of statustucal behaviour of dispersion of contaminant molecules in oscillatory flows inside uniform conduits. The main idea is to replace the constant pressure gradient which causes the flow simply by the time-dependent one, and then investigate the effects of the amplitude and frequency of the pressure pulsations on the dispersion process. The technique incorporates the case of the time-independent flow also, and gives an exact analysis of the central moments of the distribution of the cloud of contaminant, which are valid for all times after the injection. The general theory is applied to oscillatory laminar flows in tubes, and between parallel plates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194345
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Dispersion of solutes in combined free and forced convective flow through a channel (1979)
    Springer
    Acta mechanica 32 (1979), S. 211-216 
    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
    Description / Table of Contents: Zusammenfassung Es wird die Dispersion einer Lösung bei freier und erzwungener Konvektion in einem Kanal mit parallelen Wänden untersucht, falls ein konstanter horizontaler Temperaturgradient an den Kanalwänden auftritt. Es wird festgestellt, daß der effektive Taylor-Diffusionskoeffizient ansteigt mit wachsender Grashof-Zahl, und zwar gilt dies unverändert für Kühlung oder Heizung der Wände.
    Notes: Summary Dispersion of a solute in combined free and forced convective laminar flow through a parallel plate channel has been considered, when there is a uniform axial temperature variation along the channel walls. It is observed that the effective Taylor diffusion coefficient increases with increase in Grashof number and also the interesting fact that it is same for both heating and cooling of the plates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01379007
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  • 7
    Electronic Resource
    Electronic Resource
    Dispersion of contaminant in oscillatory flow through a pipe — Computation of moments (1989)
    Springer
    Acta mechanica 80 (1989), S. 151-156 
    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 Finite—difference implicit scheme is adopted to solve the Aris-moment equations of dispersion of solute in an oscillatory flow through a pipe for all time. Mean concentration distribution have been calculated from first four central moments by using Hermite polynomials and the deviations from Gaussianity have also been examined for unsteady flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178186
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