Program

P.80 -- Poster, NCTP-42

Date: Wednesday, 2 August 2017

Time: 08h30 - 10h00

Simulation of diffusion barrier and osmotic diffusion for single component systems

Vu Ba Dung and Dinh Van Thien

Hanoi University of Mining and Geology, Vietnam

Barrier diffusion and osmotic diffusion are interesting diffusion processes. In the barrier diffusion, the diffusing flux vanishes although the concentration gradient is equal to zero and in the osmotic diffusion, although the concentration gradient is equal to zero, the diffusing flux does not vanish. The diffusion barrier and osmotic diffusion often occur in multi-component systems and their cause is coupled diffusion effect (the diffusing flux of a component is coupled strongly to its diffusing flux of partner). However, barrier diffusion and osmotic diffusion can occur in single component systems and its cause is the thermal velocity in the high concentration area is smaller than that the low concentration area. In this paper, on the random walk theory, the barrier diffusion and osmotic diffusion are simulated. The results show that: i) the barrier diffusion and osmotic diffusion can occur in single component system; ii) the cause of the barrier diffusion and osmotic diffusion is the difference of thermal velocity in areas together; iii) although the barrier diffusion and osmotic diffusion is contravariant to Fick’s theory, they agree with the increasing entropy principle.

Presenter: Vu Ba Dung