Abstract
A visualization and quantification optical method for measuring binary liquid diffusion coefficient (D) based on an asymmetric liquid-core cylindrical lens (ALCL) is introduced in this paper. Four groups of control experiments were performed to verify the influences of diffusing substance category, concentration and temperature on diffusion process, and the measured D values were well consistent with data measured by Holographic interferometry and Taylor dispersion methods. The drifting of the diffusion image recorded by CCD reflects the diffusion rate visually in an easily understandable way. This optical method for measuring D values based on the ALCL is characterized by visual measurement, simplified device, and easy operation, which provides a new way for measuring liquid D value visually.
Highlights
Vividly, and the D value, based on the Fick’s second law, can be figured out either by recording the locations of “waist” at different times[15] or by analyzing a simultaneous diffusion image rapidly[16]
The feasibility for calculating D value by Eq(8) is determined mainly by whether the selected thin liquid layer meets the condition of D(C) ~ D(C2) in diffusion direction, where C and C2 are the concentrations of the thin liquid layer and the destination, respectively
The spatial distributions of solution concentration at different diffusion time have been calculated by using Eq (5) and the resulting diffusion images, the result at diffusion time of t = 45 minutes is shown in Fig. 5 by the squared dots
Summary
Vividly, and the D value, based on the Fick’s second law, can be figured out either by recording the locations of “waist” at different times[15] or by analyzing a simultaneous diffusion image rapidly[16].
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