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  • 1
    Electronic Resource
    Electronic Resource
    Direct observation of critical fluctuations in a binary mixture (1990)
    Springer
    International journal of thermophysics 11 (1990), S. 37-48 
    Details
    ISSN: 1572-9567
    Keywords: concentration fluctuations ; critical phenomena ; fractal dimensionality ; liquid mixtures ; percolation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Microscopic observations of concentration fluctuations in the range 1–500 μm have been performed in a number of binary fluids near their critical temperature (T c). A heterodyne technique has been used. The temperature range (T-T c = 1–25 mK) is such that the sizes of the fluctuations are larger than or equal to the correlation length, measured usually as the inverse half-width of the structure factor of the fluctuations. Image analysis has given some information about the free energy of the system determined from the intensity distribution function. Also, the shape of the fluctuations can be studied. These are self-similar over more than three decades, with a fractal dimension of D f = 2.8. This value is compared with a number of theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503857
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Fast adiabatic heating and temperature relaxation in near-critical fluids under zero gravity (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 1059-1067 
    Details
    ISSN: 1572-9567
    Keywords: CO2 ; critical-point phenomena ; thermal diffusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Heat transport in supercritical CO2 is studied under microgravity conditions. A large temperature and densityρ region around the critical point is explored (CO2 cells were filled at critical densityρ=ρ c and off-critical densitiesρ=ρ c±0.18ρ c). Local heating is obtained by using a small thermistor located in the bulk fluid. Through interferometric observations, a new mechanism of thermalization has been evidenced. Thermal expansion of a warm diffusing boundary layer around the heating thermistor is responsible for rapid adiabatic heating of the bulk fluid through the emission of pressure waves at the border. The scaled thickness of the thermal boundary layer follows a power law. When the heat flow stops, the bulk adiabatic heating instantaneously vanishes and the temperature relaxation inside the thermal boundary layer follows locally a diffusive process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02081275
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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