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  • 1
    Electronic Resource
    Electronic Resource
    Relative permeabilities of a near critical binary fluid (1992)
    Springer
    Transport in porous media 9 (1992), S. 241-260 
    Details
    ISSN: 1573-1634
    Keywords: Flow in porous media ; critical phenomena ; consolute temperature ; relative permeability ; capillary desaturation ; wetting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract Relative permeabilities were measured at very low interfacial tensions (IFT) for two-phase mixtures of methanol and hexane flowing through Clashach sandstone. These two components pass from a two- to a single-phase system as the temperature is increased above the critical solution temperature (CST). The interfacial tension between the coexisting phases approaches zero as the solution reaches miscibility. The phase behaviour of methanol and hexane mixtures has been well characterised allowing the calculation of relative permeabilities, saturations and capillary numbers. Flow data are reported for four different temperatures in the two-phase region (i.e., four values of IFT and capillary number). The capillary desaturation curve (CDC) for the strongly wetting methanol rich phase is also presented. In addition to the novel technique presented for measurement of relative permeability, the results indicate that relative permeabilities approach straight line functions very near the critical point. Furthermore, desaturation of the wetting phase was found to be dependent on the capillary number which, in turn, depends on the location of the mixture on the fluid phase diagram and the proximity to the critical temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00611969
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  • 2
    Electronic Resource
    Electronic Resource
    The kinetics of silylation of hydroxylated silica 1: Aerosil (1994)
    Springer
    Colloid & polymer science 272 (1994), S. 1602-1610 
    Details
    ISSN: 1435-1536
    Keywords: Aerosil ; silylation kinetics ; trimethylchlorosilane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The kinetics of the silylation of hydroxylated silica, the non-porous Aerosil using trimethylchlorosilane, under various reaction conditions has been investigated by a gravimetric technique and found to follow the law: $$\left[ {\frac{{1 + b}}{t}} \right]\ln \left\{ {\frac{{M_\infty }}{{M_\infty - M_t }}} \right\} - \frac{{M_t b}}{{M_\infty t}} = k_{\text{a}} $$ which represents a first order reaction retarded by one of its products. From this analysis, the activation energy in the temperature range 598 K to 673 K, was found to be 155 kJ mol−1. The reaction is independent of pressure at values greater than 15 torr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00664728
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    Paper (German National Licenses)
    Fulltext
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