摘要
Diffusion is a ubiquitous physical phenomenon where thermodynamic nonequilibrium effects(TNEs) are outstanding issues. In this work, we employ the discrete Boltzmann method to investigate the TNEs in the dynamic process of binary diffusion. The main features of the distribution function in velocity space are recovered and discussed.It is found that, with the decreasing gradients of macroscopic quantities(such as density, concentration, velocity, etc.),both the local and global TNEs decrease with the time but increase with the relaxation time in a power law, respectively.
作者
Chuan-Dong Lin
Kai Hong Luo
Yan-Biao Gan
Hui-Lin Lai
林传栋;罗开红;甘延标;赖惠林(Center for Combustion Energy,Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;College of Mathematics and Informatics&FJKLMAA,Fujian Normal University,Fuzhou 350007,China;Department of Mechanical Engineering,University College London,Torrington Place,London WCIE 7JE,UK;North China Institute of Aerospace Engineering,Langfang 065000,China)
基金
Supported by the MOST National Key Research and Development Programme under Grant No.2016YFB0600805
the China Postdoctoral Science Foundation under Grant No.2017M620757
the Center for Combustion Energy at Tsinghua University,Natural Science Foundation of Hebei Province under Grant Nos.A2017409014,ZD2017001 and A201500111,FJKLMAA,Fujian Normal University
the UK Engineering and Physical Sciences Research Council under the Project UK Consortium on Mesoscale Engineering Sciences(UKCOMES)under Grant No.EP/L00030X/1
