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Capillary waves of fluid interfaces near a critical point

Author

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  • Sengers, J.V.
  • Van Leeuwen, J.M.J.
  • Schmidt, J.W.

Abstract

A fluid interface near a critical point is commonly pictured as an intrinsic interface broadened by thermally excited capillary waves. A comparison of the capillary-wave theory with experiments is hampered by the presence of two short-wavelength cutoff parameters in the theory. We review a procedure introduced earlier for fixing these cutoff parameters, so that a definite comparison can be made with experimental reflectivity data reported by Huang and Webb for a binary liquid (methanol + cyclohexane) near the consolute temperature, and by Wu and Webb for a one-component fluid (sulfurhexafluoride) near the critical temperature. We show that the temperature dependence of the reflectivity data for the binary liquid is consistent with a nonuniversal temperature dependence predicted by capillary-wave theory. The reflectivity data of the vapor-liquid interface of SF6 do not appear to be consistent with the binary-liquid reflectivities and do not show the predicted temperature dependence.

Suggested Citation

  • Sengers, J.V. & Van Leeuwen, J.M.J. & Schmidt, J.W., 1991. "Capillary waves of fluid interfaces near a critical point," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 172(1), pages 20-39.
    • Handle: RePEc:eee:phsmap:v:172:y:1991:i:1:p:20-39
    DOI: 10.1016/0378-4371(91)90309-Z
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    References listed on IDEAS

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