Dipartimento di Fisica Generale and INFN, Università di Torino, via P. Giuria 1, 10125 Torino, Italy.
Phys Rev Lett. 2010 May 7;104(18):184501. doi: 10.1103/PhysRevLett.104.184501. Epub 2010 May 4.
We study the effects of polymer additives on turbulence generated by the ubiquitous Rayleigh-Taylor instability. Numerical simulations of complete viscoelastic models provide clear evidence that the heat transport is enhanced up to 50% with respect to the Newtonian case. This phenomenon is accompanied by a speed-up of the mixing layer growth. We give a phenomenological interpretation of these results based on small-scale turbulent reduction induced by polymers.
我们研究了聚合物添加剂对普遍存在的瑞利-泰勒不稳定性产生的湍流的影响。完整的粘弹性模型的数值模拟提供了明确的证据，表明与牛顿情况相比，热传递增强了高达 50%。这种现象伴随着混合层生长速度的加快。我们基于聚合物引起的小尺度湍流减少对这些结果给出了一种唯象解释。
