화학공학소재연구정보센터
Chemical Physics Letters, Vol.671, 174-181, 2017
Transport coefficients of normal liquid helium-4 calculated by path integral centroid molecular dynamics simulation
Thermal conductivity, shear viscosity, and bulk viscosity of normal liquid He-4 at 1.7-4.0 K are calculated using path integral centroid molecular dynamics (CMD) simulations. The calculated thermal conductivity and shear viscosity above lambda transition temperature are-on the same order of magnitude as experimental values, while the agreement of shear viscosity is better. Above 2.3 K the CMD well reproduces the temperature dependences of isochoric shear viscosity and of the time integral of the energy current and off-diagonal stress tensor correlation functions. The calculated bulk viscosity, not known in experiments, is several times larger than shear viscosity.(c) 2017 Elsevier B.V. All rights reserved.