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  • 1
    Electronic Resource
    Electronic Resource
    A refined droplet approach to the problem of homogeneous nucleation from the vapor phase (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 3872-3884 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A theory of homogeneous nucleation from the vapor phase is presented, which is based on an extension of Fisher's semiphenomenological droplet model for the Gibbs free energy of formation of a cluster. This droplet model allows translational, rotational, vibrational, and configurational degrees of freedom of the cluster as well as the variation of surface tension with cluster size. By suitable choice of the three free model parameters, known nucleation theories such as the classical Becker–Döring–Zeldovich theory and others are obtained as special cases. Since, however, an ansatz for the Gibbs free energy of formation allows the construction of an equation of state for real gases below the critical point, a new method of determining the model parameters is suggested, which is based on the idea of forcing the identity of the constructed equation of state with an experimentally verified one. Thus, all free model parameters can be determined purely from well-known handbook properties. It is shown that the new theory gives a better prediction of observed nucleation rates than the classical one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460663
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    An electronic Cranz–Schardin camera (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 364-368 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An electronic high-speed multiple-image camera based on the Cranz–Schardin principle has been developed. High-power LEDs are used as a light source. Frames are recorded by a system of eight CCDs and an eight channel image processor enabling a series of eight subsequent images at full-frame (512× 512) resolution or more images (up to 80) at a lower resolution. The maximum framing frequency is 10 MHz. The advantages upon the classical spark illumination and photographic techniques are mainly the precise electronic control, the immediate access to the frames, the on-line image processing and the low cost of the system. Examples of gas- and two-phase flow visualization are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142129
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Primary and secondary bifurcation in baroclinic instability (1994)
    Springer
    Mineralium deposita 29 (1994), S. 286-290 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract In modelling atmospheric flows the baroclinic instability of the flow in a differentially heated rotating annulus plays a central role. This paper deals with an experimental study using LDV and flow visualization techniques. Usually the temperature difference,ΔT, was kept fixed while the angular velocity,ω, was varied. On crossing the stability boundary, the primary bifurcation, the basic flow gives way to a baroclinic wave flow. For a given annulus geometry the wave number,m, of the first wave pattern was found to be uniquely defined byΔT. The measured critical values ofω,ω crit, agree reasonably well with those obtained by other authors. On increasingω aboveω crit the wave number changed, this process showing hysteresis. The situation might indicate secondary bifurcation phenomena. Flow visualization using aluminium particles shows surface flow details.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01816692
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The influence of kinematic waves on jet break down (1992)
    Springer
    Experiments in fluids 12 (1992), S. 173-180 
    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 breakdown of a liquid jet is commonly considered as an effect of the surface tension. However, essential aspects of the boundary wave amplification and the final disintegration of velocity modulated jets can be explained by non-linear travelling time effects, which are of purely kinematic nature. The experiments are carried out on jets with radii between 1.2 to 2.5 mm and Weber numbers between 17 to 200. The experimental results are compared with a theoretical solution which neglects the surface tension.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188256
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Oscillation modes of laval nozzle flow (1995)
    Springer
    Experiments in fluids 18 (1995), S. 145-152 
    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 Experimental investigations of Laval nozzle flow show for relatively low supply to exit pressure ratios, which correspond to shock wave positions close to the nozzle throat, three different, oscillatory instabilities. (i) Shock pattern oscillations where the root of a λ-like shock front remains nearly in constant position, but where the proportion between the normal part and the oblique part of the shock changes periodically. (ii) Shock wave and separation bubble oscillations where the motion of the shock wave is accompanied by displacements of the separation bubble. (iii) Flow rate oscillations where the shock waves leave periodically through the nozzle throat in upstream direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00230258
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Flow visualisation studies on growth of area of deflected jets (1997)
    Springer
    Experiments in fluids 23 (1997), S. 105-112 
    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  Laser light sheet visualisation, coupled with image processing, was utilised to understand the effect of exit geometry on the integral properties of jets in cross flow. The study involved jets emanating from circular and rectangular nozzles of different aspect ratios deflected by a uniform free-stream. The investigation considers incompressible momentum jets with exit Reynolds number in the range of 4400–9200, the velocity ratios being 3.9, 5.9 and 7.8. In contrast to a deflected circular jet, those jets emanating from blunt configurations tend to have higher growth rates initially and are devoid of the horse-shoe or the bound vortex system in their cross section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003480050091
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Forced oscillations of airfoil flows (1996)
    Springer
    Experiments in fluids 21 (1996), S. 457-464 
    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 effect of background flow oscillations on a transonic airfoil (NACA 0012) flow was investigated experimentally. The oscillations were generated by means of a rotating plate placed downstream of the airfoil. Owing to the expansion and compression waves generated at the plate, the flow over the airfoil flow was drastically disturbed. This resulted in the presence of high intensity oscillations of a shock wave and a separation bubble on the suction surface of the airfoil. For relatively large values of the airfoil angle of attack, weak shock waves (transonic sound waves) were periodically shed upstream of the airfoil. This work was supported by Commission of the European Communities (Communit's Action for Cooperation in Science and Technology with Central and Eastern European Countries).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189048
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Primary and secondary bifurcation in baroclinic instability (1990)
    Springer
    Experiments in fluids 8 (1990), S. 286-290 
    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 modelling atmospheric flows the baroclinic instability of the flow in a differentially heated rotating annulus plays a central role. This paper deals with an experimental study using LDV and flow visualization techniques. Usually the temperature difference, ΔT, was kept fixed while the angular velocity, ω, was varied. On crossing the stability boundary, the primary bifurcation, the basic flow gives way to a baroclinic wave flow. For a given annulus geometry the wave number, m, of the first wave pattern was found to be uniquely defined by ΔT. The measured critical values of ω, ω crit, agree reasonably well with those obtained by other authors. On increasing ω above ω crit the wave number changed, this process showing hysteresis. The situation might indicate secondary bifurcation phenomena. Flow visualization using aluminium particles shows surface flow details.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00187231
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    A pulsed light generator for high speed photography (1987)
    Springer
    Experiments in fluids 5 (1987), S. 141-144 
    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 pulsed light generator for stroboscopic photography which makes use of LED's has been developed. The maximum light power which may be extracted from a single LED is approximately 1 Watt. The pulse repetition rate ranges up to 1 MHz and the length of the pulses is adjustable between 0.05 and 1 μs. The light emitted from the diodes is especially suited for the observation of phase objects by interferometric methods due to its pronounced coherence. Results of the electrical and optical performance of the generator are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00776185
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    On the applicability of background oriented optical tomography for large scale aerodynamic investigations (2000)
    Springer
    Experiments in fluids 28 (2000), S. 477-481 
    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  Density fields of the blade tip vortices from a helicopter in hover flight were visualized by a technique which does not require any installation on the helicopter or close to it. The results illustrate an encouraging prospect for the applicability of the technique. It offers the capability of at least qualitative investigations of unsteady density fields even in full-scale flight tests. The underlying principle is briefly described in this article and an extension to a three-dimensional quantitative technique by using multiple cameras is outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003480050408
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    Paper (German National Licenses)
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