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  • 1980-1984  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The theory of the Taylor dispersion technique for liquid diffusivity measurements (1980)
    Springer
    International journal of thermophysics 1 (1980), S. 243-284 
    Details
    ISSN: 1572-9567
    Keywords: diffusion coefficient ; liquid mixtures ; Taylor dispersion ; liquid diffusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper presents a complete analysis of the theory of an instrument to measure the diffusion coefficients in liquid mixtures based upon the phenomenon of Taylor dispersion. The analysis demonstrates that it is possible to design an instrument that operates very nearly in accordance with the simplest mathematical description of the dispersion of a solute pulse in a fluid in laminar flow within a straight, circular cross-section tube. The small departures of a practical instrument from the ideal are evaluated as corrections by means of a general perturbation treatment that allows them to be examined one at a time. The corrections considered include the effects of the finite volume of the injection pulse, the finite volume of the concentration monitor, the coiling of the tube, and the nonuniformity and noncircularity of the cross section, as well as the variation of the fluid properties with composition. All the equations necessary for the design of an instrument of this type, and for the evaluation of experimental data free from significant systematic errors, are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00517126
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mutual diffusion coefficients for binary mixtures of normal alkanes (1982)
    Springer
    International journal of thermophysics 3 (1982), S. 307-323 
    Details
    ISSN: 1572-9567
    Keywords: diffusion coefficient ; hydrocarbons ; liquid mixtures ; Taylor dispersion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper describes the design and operation of a new instrument for the measurement of diffusion coefficients in liquid mixtures. The instrument employs the principle of Taylor dispersion and has been designed so that it operates as nearly as possible in accordance with the simplest possible mathematical description of the measurement process. The remaining departures from the simple description are accommodated by means of small corrections which have been evaluated from a detailed theory of a practical instrument so that accurate measurement of diffusion coefficients may be performed. The apparatus has been employed to make a series of measurements of the mutual diffusion coefficient of binary mixtures among the normal alkanes hexane, heptane, and octane. The measurements have been performed at atmospheric pressure in the temperature range 290–340 K and over the entire range of mixture composition. It is estimated that the experimental data have an associated uncertainty of ±1%. The temperature and composition dependences of the mutual diffusion coefficient have been found to be linear, and the entire body of experimental data is represented by a simple correlating equation within its estimated uncertainty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00502347
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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