Investigation of nonclassical effects during fast transient mass diffusion

Abstract

Experiments on fast transient mass diffusion between a NaCl solution and pure water were conducted. The speed of mass propagation, the concentration profiles, and other quantities were determined experimentally. A physical mechanism that is different from the description of classical diffusion law was revealed by the experiments, and a related theoretical analysis was also made. The results indicate that the calculated results are in good agreement with the experimental data. The modified Ficks formulation more realistically reflects the characteristics of fast transient mass diffusion.

Soret Effects on Non-Fourier Heat and Non-Fickian Mass Diffusion Transfer in a Slab

“…There are also few investigations of experiments on fast transient mass diffusion. Huai et al [8] presented an experimental investigation on fast transient mass diffusion between a NaCl solution and pure water, which obtained the mass diffusion properties. They also indicated that the modified Fickian formulation, i.e., non-Fickian model, more realistically reflects the characteristic of the fast transient mass diffusion than that of the classical Fickian law.…”

“…Heat and mass transport at the microscale is of vital importance in microtechnology applications. Nonequilibrium thermodynamic theory using the non-Fourier or non-Fickian equations has seen great developments recently [1][2][3][4][5][6][7][8][9][10][11][12].…”