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  • 1
    Electronic Resource
    Electronic Resource
    Thermohydrodynamic conditions at the peak flux of horizontal heaters in superfluid liquid helium II at zero net mass flow (1972)
    Springer
    Heat and mass transfer 5 (1972), S. 141-146 
    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 Spitzenwärmestrommessungen (für das Einsetzen von Filmsieden) in He II werden als diagnostische Methode benutzt, um die nicht-klassische Thermohydrodynamik des superfluiden Heliums für horizontale Heizflächen unter den Bedingungen verschwindenden Gesamtmassenstroms zu bestimmen. Meßwerte für den einzelnen horizontalen Zylinder in einem großen Flüssigkeitsbad werden näherungsweise erfaßt mit einer Potenzbeziehung zwischen der dimensionslosen nichtklassischen superfluiden Transportkenngröße und der vierten Wurzel der dimensionslosen thermomechanischen Potentialdifferenz. Daten für Transport in engen vertikalen Flüssigkeitszylindern (mit isolierten Wänden und geschlossenem unteren Ende) werden mit modifizierten Gorter-Mellink-Gleichungen näherungsweise wiedergegeben. In den Gleichungen wird die Sättigungshypothese verwendet, welche lokalen Siedebeginn postuliert bei Erreichen des Gleichgewichts — zwischen gesättigtem He II und seinem Dampf — in Heizernähe.
    Notes: Abstract Measurements of the peak flux (at the onset of film boiling) in He II are used as a diagnostic tool to investigate the non-classical thermohydrodynamics of superfluid liquid helium for horizontal heaters at zero net mass flow. Data for the single horizontal cylinder in a large pool of He II are approximately accounted for by a power law describing the dimensionless nonclassical superfluid transport number as a function of the fourth root of the dimensionless thermo-mechanical driving potential. Results for transport in narrow vertical cylinders (with insulated walls and lower end closed) are approximately described on the basis of the Gorter-Mellink transport equations. The saturation hypothesis is used which postulates local onset of boiling when vapor-liquid equilibrium is reached at the heater.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01682662
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal conditions at the Gorter-Mellink counterflow limit between 0.01 and 3 bar (1975)
    Springer
    Journal of low temperature physics 21 (1975), S. 447-462 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Gorter-Mellink counterflow limits (at zero net mass flow) have been measured from 0.01 bar to about 3 bar in relatively wide ducts of rectangular (0.05 cm wide) and circular cross section (0.446 cm inner diameter). The observed limiting temperatures did not show metastable superheating of He II. Instead, they were controlled by the equilibrium state phase boundaries of the superfluid He4. Small departures from the related maximum temperature differences were in part caused by fluid acceleration and finite thermomter sizes, respectively. The measured limiting heat fluxes agree with the prediction based on the equilibrium state limits of the Gorter-Mellink temperature differences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01141337
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of thermohydrodynamic shock on He I-He II interfacial domain transport (1986)
    Springer
    Journal of low temperature physics 62 (1986), S. 213-232 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experiments probing He II-He I coexistence show that in the presence of heat flow there exists a thin interfacial domain. A thermohydrodynamic shock model is proposed to predict the location of the shock domain in the4He phase diagram. Experimental domain thicknesses are reported that are consistent with the model prediction. Consequences of the model for other cases are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683461
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  • 4
    Electronic Resource
    Electronic Resource
    Film boiling of Helium I and other liquefied gases on single wires (1959)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 5 (1959), S. 403-406 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Heat transfer coefficients have been obtained for natural-convection film boiling of helium I on single wires with a diameter ranging from 5 to 50 μ. The measurements covered temperature differences of 30° to 1,000 °K. between the heating surface and the saturated liquid under atmospheric pressure. The results are correlated in dimensionless from (Nusselt number vs. the product of the Grashof and Prandtl numbers) and compared with data for nitrogen and measurements of other investigators on film boiling of liquefied gases.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690050329
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of interfacial instability on film boiling of saturated liquid helium I above a horizontal surface (1966)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 12 (1966), S. 238-244 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Film boiling above a horizontal surface has been investigated theoretically and experimentally at standard gravity and 1 atm. Theoretical film boiling results for conventional fluids have been extended, on the basis of interfacial instability due to gravity, to include liquefied gases properties, such as low viscosity and small surface tension. In the experiments, primarily ordinary liquid helium I has been studied to extend the range of the film boiling Rayleigh numbers (based upon Laplace's reference length) from about 107 (reported for room temperature liquids) to values of the order of magnitude unity. The heat transfer data taken at surface excess temperatures ΔT (above the boiling point) between 80° and 300°K. have been correlated with a theoretical model which presumes the absence of any scaling length (Laplace length) associated with surface tension. At low ΔT the experimental results have been found to agree with a model which presumes a negligible influence of a scaling length due to surface tension and absence of detectable viscosity effects.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690120207
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal exchange diffusivity in nucleate boiling (1964)
    Springer
    Flow, turbulence and combustion 13 (1964), S. 371-388 
    Details
    ISSN: 1573-1987
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The phase conversion occurring in nucleate boiling is investigated by referring to the vapor-liquid exchange concept and making use of the boiling enthalpy ratio (liquid excess enthalpy ρL C L ΔT/vapor excess enthalpy ρυ λ). The ratio serves as a criterion to distinguish two fundamentally different kinds of boiling equations: first, thermodynamically oriented correlations which do not account for the exchange effect; and secondly, rate process equations describing the exchange as a function of governing system parameters. Taking advantage of the first possibility allows the correlation of the metastable liquid superheat as a function of reduced thermodynamic coordinates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00382063
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