VISCOUS DAMPING OF THERMAL EXCITATIONS ON INTERFACE OF CRITICAL FLUID MIXTURES

被引:56
作者
HUANG, JS
WEBB, WW
机构
[1] Department of Physics, Laboratory for Atomic and Solid State Physics, Cornell University, Ithaca
[2] Department of Applied Physics, Laboratory for Atomic and Solid State Physics, Cornell University, Itaca
关键词
D O I
10.1103/PhysRevLett.23.160
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Measurements of the time-dependent correlation function for small-angle scattering of visible light by the interface in a fluid mixture to within 3×10-3°K of its critical temperature Tc have revealed thermal excitations with exponential relaxation times τ up to about 20 sec. Analysis has shown that τ varies inversely as the wave number Q and diverges on approaching the critical temperature as (1-TTc)-1.27. Identification of τ with viscous damping of hydrodynamic waves on the interface permits determination of the critical behavior of the shear viscosity which is found to be at most only weakly divergent. © 1969 The American Physical Society.
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页码:160 / &
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