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  • 1990-1994  (3)
  • 1
    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 Entsprechend der in [1–3] beschriebenen Methode der Ähnlichkeitstransformation werden die gewöhnlichen Differential — Grundgleichungen der laminaren freien Konvektion von Gasen unter Verwendung der Boussinesq — Approximation aufgestellt. Diese Gleichungen entsprechen, wie in [2, 3] beschrieben, dem FallT w /T ∞ → 1 undn c p → 0. Die Abweichungen der berechneten örtlichen Nusselt-Zahlen infolge Vernachlässigung der Veränderlichkeit der thermophysikalischen Stoffwerte werden in Abhängigkeit vonT w /T ∞ für mehrere Gase ermittelt, wobei sich herausstellt, daß die Veränderlichkeit der Stoffwerte bei der Berechnung zu berücksichtigen ist.
    Notes: Abstract According to the similarity transformation method described in [1–3], the ordinary differential governing equations of laminar free convection of gases with Boussinesq's approximation are set up. The equations are corresponding to the caseT w /T ∞ → 1 and c p → 0 as discussed in [2, 3]. The deviations of the predicted local heat transfer coefficients and local Nusselt numbers due to ignoring the variable thermophysical properties are calculated out theT w /T T ∞ for several gases, and the necessity of the treatment for considering variable thermophysical properties is pointed out.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    International journal of thermophysics 14 (1993), S. 1221-1227 
    ISSN: 1572-9567
    Keywords: Burnett apparatus ; HFC-32 ; refrigerants ; vapor pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A slightly modified Burnett apparatus has been used to measure 32 vapor-pressure data for HFC-32 in the temperature range from 273.39 to 347.29 K. The uncertainties of temperature and pressure are estimated to be within ±10 mK and ±500 Pa, respectively. The purity of the sample used in this work is 99.95%. On the basis of our data and of data from the literature, a vapor-pressure equation for HFC-32 is also proposed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International journal of thermophysics 14 (1993), S. 1221-1227 
    ISSN: 1572-9567
    Keywords: Burnett apparatus ; HFC-32 ; refrigerants ; vapor pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A slightly modified Burnett apparatus has been used to measure 32 vapor-pressure data for HFC-32 in the temperature range from 273.39 to 347.29 K. The uncertainties of temperature and pressure are estimated to be within ±10 mK and ±500 Pa, respectively. The purity of the sample used in this work is 99.95%. On the basis of our data and of data from the literature, a vapor-pressure equation for HFC-32 is also proposed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
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