The author presented a theory on this effect a few years ago and plans to simulate this phenomenon in the near future. This problem is now intensively simulated in our group. One motivation was appealing experiments by Professor Hajime Tanaka at Tokyo University. But we hope to predict more than in previous experiments. This effect is really surprising but is not yet widely recognized.
Nobody deeply understands it.
We are thus simulating this effect for entangled polymer solutions. In viscoelastic systems, effects of shear can be quite different from those in near-critical fluids. There is strong similarity between the butterfly scattering in stretched gels and the scattering from entangled polymer solutions in shear. The network is permanent in gels and transient in polymer solutions. We are trying to examine the fluctuations inside the coexistence curve, where real phase separation occurs and is drastically influenced by shear.