Würger Alois
CPMOH, CNRS-Université Bordeaux 1, 351 cours de la Libération, 33405 Talence, France.
Phys Rev Lett. 2007 Mar 30;98(13):138301. doi: 10.1103/PhysRevLett.98.138301. Epub 2007 Mar 29.
In a hydrodynamic approach to thermophoretic transport in colloidal suspensions, the solute velocity u and the solvent flow v(r) are derived from Stokes' equation, with slip boundary conditions imposed by thermal Marangoni forces. The resulting fluid velocity field v(r) significantly differs from that induced by an externally driven particle. We find, in particular, that thermophoresis due to surface forces is insensitive to hydrodynamic interactions. As a consequence, the thermal diffusion coefficient D(T) of polymer solutions is independent of molecular weight and concentration.
在一种用于胶体悬浮液中热泳输运的流体动力学方法中，溶质速度u和溶剂流v(r)由斯托克斯方程导出，并施加由热马兰戈尼力产生的滑移边界条件。由此产生的流体速度场v(r)与由外部驱动粒子引起的速度场有显著差异。我们特别发现，由表面力引起的热泳对流体动力学相互作用不敏感。因此，聚合物溶液的热扩散系数D(T)与分子量和浓度无关。
