Thermodynamic Nonequilibrium Features in Binary Diffusion |
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| Authors: | Chuan-Dong Lin Kai Hong Luo Yan-Biao Gan Hui-Lin Lai |
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| Institution: | 1. 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;
2. College of Mathematics and Informatics & FJKLMAA, Fujian Normal University, Fuzhou 350007, China;
3. Department of Mechanical Engineering, University College London, Torrington Place, London WC1E 7JE, UK;
4. North China Institute of Aerospace Engineering, Langfang 065000, China |
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| Abstract: | 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. |
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| Keywords: | thermodynamic nonequilibrium binary diffusion discrete Boltzmann |
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