THE MICROPORE FLOW OF H2O AND D2O THROUGH ACTIVATED CARBON RODS

Authors:
  • MHM. E. Huber
    M. E. Huber
  • EFE. A. Flood
    E. A. Flood
  • RHR. D. Heyding
    R. D. Heyding
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Abstract
The flow rates of water adsorbed on activated charcoal have been measured at temperatures between −24 °C. and +35 °C. and compared with the flow rate of adsorbed D2O at 25 °C. In earlier papers a formula was presented which describes the micropore flow rate of adsorbed water as a laminar flow of liquid adsorbate under a high pressure gradient due to surface forces. Our results confirm this picture. From our flow data the relative viscosity of adsorbates can be calculated. Above 0 °C. the viscosity of the adsorbate shows nearly the same temperature dependence as liquid water; below 0 °C. the viscosity increases much more rapidly, but there is no sudden increase which could be ascribed to freezing of an appreciable fraction of the adsorbate at any particular temperature. The greater temperature coefficient of the adsorbate viscosity is consistent with a viscous flow of liquid films over a solid surface which exerts attractive forces on the liquid.

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