Force Rayleigh scattering (FRS) was used to analyze the flow-induced anisotropic thermal conduction in a polymer liquid. Time-dependent measurements of the complete thermal diffusivity tensor were described on an entangled polymer melt subjected to a uniform shear deformation. The measurements were made using an improved version of the method that allows for more controlled deformations to be imposed and for precise measurements of the thermal diffusivity. The results provide the direct evidence that the thermal conductivity tensor and the stress tensor are linearly related in a deformed polymer liquid.
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy