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  • 1
    Electronic Resource
    Electronic Resource
    Improved flow visualization technique for quantitative velocity measurement in small test volumes (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 264-267 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A flow visualization technique which utilized a photochromic dye in solution was introduced by Popovich and Hummel in 1967. The dye was activated along narrow trace lines by passing sharply focused beams from an ultraviolet light source through the solution. The movement of the dye traces were recorded by high-speed cinematography and velocities were found from analysis of the resulting pictures. Two variations to this basic method are described. These permit more accurate velocity measurements to be made in certain liquid systems where test volumes are small or near physical barriers, and where the flow is two dimensional or is time dependent. Manufacture of a suitable dye and construction of an inexpensive pulse laser which may be used as an ultraviolet light source are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138527
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Linear Stability Analysis of Falling Liquid Films (1974)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 13 (1974), S. 289-291 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i160051a026
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Liquid-Liquid Driven Cavity Flow
    Amsterdam : Elsevier
    Journal of Computational Physics 110 (1994), S. 274-284 
    Details
    ISSN: 0021-9991
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Computer Science , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/jcph.1994.1024
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Heterogener Zerfall von N2O an Katalysatoren mit variabler Aktivität (1951)
    Springer
    Monatshefte für Chemie 82 (1951), S. 840-846 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Es wurde die Spaltung von Stickoxydul an Kupferoxyd und Lanthanoxyd als Katalysator gemessen. Bei geringen Umsätzen war die Reaktion erster Ordnung. Die Auswertung der Geschwindigkeitskonstanten nach derArrheniusschen Gleichung ergab eine Bestätigung der Beziehung $$\log A = q/a + const.$$ über 30 kcal Unterschied in den Aktivierungswärmen. Die Aktivierungs-ärmen zeigten sich von der Vorbehandlungstemperatur abhängig, beim Kupferoxyd stiegen sie über das ganze Intervall proportional mit der Vorbehandlungstemperatur an, wohingegen die elektrische Leitfähigkeit des (in Pastillen gepreßten) Pulvers linear mit der Vorbehandlungstemperatur abfiel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00905121
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  • 5
    Electronic Resource
    Electronic Resource
    A comparison of elastic and plastic contact models for the prediction of thermal contact conductance (1993)
    Springer
    Heat and mass transfer 28 (1993), S. 441-448 
    Details
    ISSN: 1432-1181
    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 Gemessene Werte von thermischen Kontaktwiderständen wurden mit Werten verglichen, die mit Hilfe zweier verschiedener Modellvorstellungen erhalten wurden. Eine dieser Modellvorstellungen beruht auf der Annahme von elastischem Kontakt, während das zweite Modell plastischen Kontakt annimmt. Obwohl der hohe Wert eines Plastizitätsindexes auf eine plastische Verformung der Rauhigkeiten der sich berührenden Oberflächen hinweist, stimmen die gemessenen Kontaktwiderstände besser mit den Widerständen überein, die mit Hilfe des elastischen Kontaktmodells berechnet wurden.
    Notes: Abstract Experimentally determined thermal contact resistance (conductance) data are compared with predictions based on two different theories. One of the theories assumes elastic contact, while the other theory is based on the assumption of plastic contact. Even though the high plastic index calculated for the contacting surface suggested that contacting asperities would deform plastically, the experimental data generally agree better with the predictions obtained using the elastic contact model than with the predictions obtained using the plastic contact model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01539674
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  • 6
    Electronic Resource
    Electronic Resource
    On condensation mass transfer in the presence of noncondensables (1970)
    Springer
    Heat and mass transfer 3 (1970), S. 191-196 
    Details
    ISSN: 1432-1181
    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 wurde der Einfluß des bewegten Kondensatfilms auf den Stoffübergang aus dem Gas-Dampf-Gemisch an das Kondensat untersucht. Die maßgebenden Erhaltungsgleichungen für Energie und Stoff wurden nach der Methode von Crank-Nicholson gelöst. Die Ergebnisse zeigen, daß der bewegte Kondensatfilm den Stoffübergang bei der Kondensation beträchtlich beeinflussen kann.
    Notes: Abstract An analysis is made for the influence of the moving condensate film on the mass transfer rate from the gas-vapor mixture to the condensate. The governing energy and mass conservation equations are solved using the Crank-Nicholson method. The results show that the moving condensate film may have a considerable effect on condensation mass transfer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01106716
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Investigation of the flowfield immediately upstream of a hot film probe (1985)
    Springer
    Experiments in fluids 3 (1985), S. 215-220 
    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 laminar flowfield in a rectangular channel immediately upstream of a hot film gradient probe with two parallel films was investigated in the range of Reynolds number Re pr= 6 to 95, with the Reynolds number based on the probe diameter and the local flow velocity. For this study a photochromic dye flow visualization technique was used. The results show that the smaller the Reynolds number Re prthe larger the influence of the probe is upon the flowfield. No distinct influence of the probe location relative to the channel walls on the flow deceleration process immediately upstream of the probe was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265104
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Drop formation in liquid-liquid systems (1988)
    Springer
    Experiments in fluids 7 (1988), S. 210-213 
    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: Conclusion An experimental method for determining the momentum flux on a drop for a nozzle with an arbitrary fluid velocity profile at the exit has been described. I t was observed that the variation of drop volume with flow rate can differ some-what from that conceived in previous drop formation models, in that drop volume does not necessarily vary smoothly with flow rate. High-speed motion pictures of drop formation and detachment show that the drop oscillates as it grows. I t is believed that this oscillation is related to the observed unsteady variation of drop volume with flow rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02332987
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Stability characteristics of condensate films (1973)
    Springer
    Heat and mass transfer 6 (1973), S. 32-37 
    Details
    ISSN: 1432-1181
    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 Mit Hilfe der linearen Stabilitätstheorie werden die Stabilitätseigenschaften laminarer Kondensatfilme an einer geneigten Wand untersucht. Es zeigt sich, daß Kondensatfilme in jedem praktischen Fall ein unstabiles Verhalten aufweisen. Der stabilisierende Einfluß von Oberflächenspannung, Schwerkraft und Stoffübertragung durch Kondensation bewkkt jedoch, daß Störungen in bestimmten Wellenlängenbereichen gedämpft werden.
    Notes: Abstract The linear stability theory is used to study stability characteristics of laminar condensate film flow down an arbitrarily inclined wall. A critical Reynolds number exists above which disturbances will be amplified. The magnitude of the critical Reynolds number is in all practical situations so small that a laminar gravity-induced condensate film can be expected to be unstable. Several stabilizing effects are acting on the film flow; at an inclined wall these effects are due to surface tension, gravity and condensation mass transfer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01270702
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  • 10
    Electronic Resource
    Electronic Resource
    Laminar stability analysis of condensate film flow (1974)
    Springer
    Heat and mass transfer 7 (1974), S. 14-21 
    Details
    ISSN: 1432-1181
    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 Mit Hilfe der linearen StabilitÄtstheorie werden die StabilitÄtseigenschaften laminarer Kondensatfilme an ebenen WÄnden untersucht. Die Gleichungssysteme, die Temperatur- und Geschwindigkeitsstörungen beschreiben, werden numerisch gelöst. Es zeigt sich, da\ Kondensatfilme in jedem praktischen Fall ein unstabiles Verhalten aufweisen. Der stabilisierende Einflu\ von OberflÄchenspannung, Schwerkraft und Stoffübertragung durch Kondensation werden diskutiert. Für eine senkrechte Wand werden die zu erwartenden WellenlÄngen der Störungen als Funktion der Reynoldszahlen des Kondensatfilms angegeben.
    Notes: Abstract The linear stability theory is used to study stability characteristics of laminar gravity-induced condensate film flow down an arbitrarily inclined wall. The coupled equations describing the velocity and temperature disturbances are solved numerically. The results show that laminar condensate films are unstable in all practical situations. Several stabilizing effects are acting on the film flow; these are: the angle of inclination, the surface tension at large wave numbers, the condensation rate at small Reynolds numbers, and to a certain extent the Prandtl number. For a vertical plate, the expected wavelengths of the disturbances are presented as functions of the Reynolds numbers of the condensate flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438316
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