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  • 1
    Electronic Resource
    Electronic Resource
    A study of the separative performance of an underexpanded jet interacting with background gas mixtures (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1829-1837 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The separating action of a rarefied, underexpanded jet on a mixture of background gases has been applied to the separation of gaseous isotopes. The technique is known as the jet membrane separation process. In this paper we examine in greater detail the separative performance of rarefied jets from orifices and short tubes. The situation where there is a significant leakage of the background species into the jet's stagnation region is studied in detail, as this condition is of interest for applications. Based on the Muntz, Hamel, and Maguire (MHM) analysis [AIAA J. 8, 1651 (1970)], simple predictions of the background species' number density distributions and elementary separation factors for an orifice and a short tube are developed and compared to experiment. An expression for the separative power per orifice or per tube is derived. Experiments on separative performance with upflow were done and the results compared to the predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342916
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The manipulation of capillary stream breakup using amplitude-modulated disturbances: A pictorial and quantitative representation (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 1124-1140 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Droplet formation from capillary streams of viscous low vapor pressure fluids in a vacuum has been studied. A new form of capillary stream breakup, which entails the use of an amplitude-modulated sinusoidal disturbance, has been employed extensively in this work. The genesis of droplets formed due to an amplitude-modulated disturbance on a stream is reviewed in some detail and illustrated pictorially. Because capillary stream breakup and subsequent droplet propagation took place in a vacuum there were no significant interactions with the surrounding atmosphere. Sensitive measurements of the relative speeds of each drop have been made by allowing them to travel 6 m in a vertical vacuum chamber, and measuring the time between drops using an optical method. Speed differences as low as 3.5×10−7 times the average stream speed have been measured. New information about capillary stream breakup is inferred by comparing the speed variations for droplet streams generated with both amplitude-modulated disturbances and single-frequency disturbances. An autoregressive model is developed and found to represent the deviations in time between droplets with consistency and reproducibility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857612
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    New technique for producing highly uniform droplet streams over an extended range of disturbance wavenumbers (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 279-284 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A recent discovery about a well-studied phenomenon leads to the formation of ultracoherent streams of liquid drops. A remarkably straightforward, although previously unreported, method of drop generation from capillary streams, which involves the imposition of an amplitude modulated sinusoidal carrier disturbance, is discussed. The amplitude-modulated disturbance results in the production of highly stable droplet streams over a previously unattainable range of wavenumbers. A decrease in the speed variation of the drops within the stream, which is a result of the amplitude modulation, is demonstrated over a range of nondimensional wavenumbers from 0.4 to 0.04. The nondimensional wavenumber is the ratio of stream circumference to disturbance wavelength. It is suggested that amplitude modulating the capillary stream's disturbance may also decrease the diameter variation of the drops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139322
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Rarefied Gas Dynamics (1989)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 21 (1989), S. 387-422 
    Details
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.fl.21.010189.002131
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    Paper (German National Licenses)
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