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  • 1
    Electronic Resource
    Electronic Resource
    Experimental apparatus for measuring the thermal diffusivity of pure fluids at high temperatures (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 911-921 
    Details
    ISSN: 1572-9567
    Keywords: critical region ; light scattering ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Dynamic light scattering represents a suitable method for measuring the thermal diffusivity of optically transparent fluids. The classic application of the method is the immediate vicinity around the critical point due to its dependence upon the intensity of scattered light and its high sensitivity to undesired light scattering. By means of subsequent modifications of the experimental setup, we have been able to expand this region of applicability over the last 12 years and could systematically investigate numerous substances and their binary mixtures within a temperature range of 280 K〈T〈350 K. Our planned investigation of fluids suitable for ORC-HP-technology necessitates performing measurements at higher temperatures and pressures. The experimental apparatus newly designed for this purpose is capable of sustaining a relatively high temperature constance at temperatures up to 700 K. Factors restricting the measurable range of state and their influence on the design of the sample cell are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01133259
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal diffusivity of fluids in a broad region around the critical point (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 165-180 
    Details
    ISSN: 1572-9567
    Keywords: dynamic light scattering ; ethane ; gas-liquid critical point ; nitrous oxide ; sulfur hexafluoride ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Dynamic light scattering is a suitable method for the investigation of transport properties such as the thermal diffusivity of optically transparent fluids. The main advantages of the method are its quickness, the fact of the thermodynamic state of equilibrium of the sample (gradients are not required), and the relatively simple evaluation of data without the necessity of calibration. However, an insufficient production of intensity of scattered light may be a limiting effect. For that reason the vicinity of the gas-liquid critical point represents the classical range of application. In this paper, it is shown that by means of an appropriate choice of experimental apparatus, measurements are also feasible in an extended range of states. Broad regions around critical points of three pure fluids (sulfur hexafluoride, SF6; ethane, C2H6; nitrous oxide, N2O) over temperature ranges ¦T-T c¦ of 0.02 to 50 K and density ranges (ρ/ρc) of 0.2 to 2 were investigated. In this region the thermal diffusivity shows great variations with temperature and density and cannot be described by means of ideal-gas behavior or relations for liquids. The measurements were carried out along the coexistence curve for both phases, along the critical isochore and along some isotherms with T≶T c. The measured or calculated density, pressure, and thermal diffusivity data as well as some correlations are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00515200
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Optische Bestimmung von Dichteschichtungen im kritischen Zustand (1967)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 39 (1967), S. 291-296 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In der Nähe des kritischen Zustandes bildet sich infolge der hohen Kompressibilität in einem ruhenden fluiden Medium eine mit der Höhe veränderliche Dichte aus. Diese Dichteschichtung wurde an CO2, N2O und CF3Cl sowie an Gemischen aus diesen Stoffen über die örtliche Brechzahl bestimmt. Die Versuchsapparatur wurde besonders sorgfältig auf konstanter Temperatur gehalten, so daß einwandfreie Gleichgewichtszustände erzielt wurden. Aus den Ergebnissen lassen sich die Grenzkurve, die Dampfdruckkurve und das Druck-Dichte-Diagramm in der Nähe des kritischen Zustandes mit größerer Genauigkeit bestimmen, als es durch die bisher übliche Messung von Mittelwerten der Dichte möglich war.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330390516
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    Paper (German National Licenses)
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