tailieunhanh - Simulation of the Single Uphill and Osmotic Diffusion

In this paper, the uphill and osmotic diffusion in single component systems (single uphill and osmotic diffusion) are presented and simulated. Results showed that: The uphill and osmotic diffusion can take place for single component systems; the cause of single uphill and osmotic diffusion is thermal velocity of molecules in low concentration region is greater than that in high concentration region; simulated results agree with the theory. | VNU Journal of Science: Mathematics – Physics, Vol. 32, No. 4 (2016) 20-25 Simulation of the Single Uphill and Osmotic Diffusion Vu Ba Dung* Department of Physics, Hanoi University of Mining and Geology Received 12 October 2016 Revised 19 November 2016; Accepted 25 December 2016 Abstract: Uphill diffusion is a process of mass transmission in which the diffusion flux goes up to high concentration region and the mass flux of osmotic diffusion is not vanishing, when concentration gradient is equal to zero. Most of the uphill and osmotic diffusion takes place in multicomponent systems and the cause of uphill diffusion is the diffusion flux of any species is coupled with that of its partner species. In this paper, the uphill and osmotic diffusion in single component systems (single uphill and osmotic diffusion) are presented and simulated. Results showed that: i) The uphill and osmotic diffusion can take place for single component systems; ii) the cause of single uphill and osmotic diffusion is thermal velocity of molecules in low concentration region is greater than that in high concentration region; iii) simulated results agree with the theory. Keywords: Single uphill and osmotic for single component systems. 1. Introduction Based on direction and value of diffusion flux, diffusion can be divided into four types () [1]: i) Downhill diffusion (normal diffusion): the diffusion flux goes from a high concentration area to a low concentration area; ii) Uphill diffusion: the diffusion flux goes up to higher concentration area; iii) Diffusion barrier: concentration gradient is not equal to zero, but diffusion flux is vanishing; iv) Osmotic diffusion: although concentration gradient is equal to zero, diffusion flux is not vanishing. downhill diffusion J uphill diffusion diffusion barrier osmotic diffusion dC dx 0 downhill diffusion Figure 1. The diffusion classification. _ Tel.: 84-936991944 Email: vubazung305@ 20 . Dung / VNU Journal of

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