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We report an elastic-light-scattering experiment for a semidilute polymer solution under a uniform laminar shear flow. The concentration fluctuations are greatly enhanced by shear flow and their structure is highly anisotropic in both the weak ({γ} ̇ \.{}{}τd{}1) and strong ({γ} ̇ \.{}{}τd{}1) shear regimes, where {γ} ̇ \.{}{} is the shear rate and τd is the longest relaxation time of the system. The anisotropy is qualitatively different from binary liquid mixtures under a shear flow as a result of the strong coupling between the concentration fluctuations and the hydrodynamic flow.
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Wu et al. (1991) studied this question.
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