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A novel visualization technique for measuring liquid diffusion coefficient based on asymmetric liquid-core

Licun Sun¹, Xiaoyun Pu¹

¹Department of Physics, Yunnan University, Kunming, Yunnan 650091, China.

Scientific Reports

|June 22, 2016

Summary

This study introduces a new optical method using an asymmetric liquid-core cylindrical lens (ALCL) to visually measure liquid diffusion coefficients (D). The ALCL method offers a simplified, visual, and easy way to determine diffusion rates, validated against established techniques.

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Area of Science:

Physical Chemistry
Optical Physics
Fluid Dynamics

Background:

Accurate measurement of binary liquid diffusion coefficients (D) is crucial for understanding mass transport phenomena.
Existing methods for measuring D can be complex or require specialized equipment.
A need exists for simpler, more visual, and accessible techniques for D determination.

Purpose of the Study:

To introduce and validate a novel optical method for measuring binary liquid diffusion coefficients (D).
To demonstrate the visual representation of diffusion rates using a charge-coupled device (CCD) camera.
To assess the influence of substance type, concentration, and temperature on the diffusion process.

Main Methods:

Development of a measurement technique based on an asymmetric liquid-core cylindrical lens (ALCL).
Utilizing a CCD camera to record the drifting diffusion image, providing visual feedback on diffusion rate.
Conducting control experiments to investigate the effects of diffusing substance category, concentration, and temperature.

Main Results:

The ALCL optical method successfully visualized and quantified binary liquid diffusion coefficients (D).
Measured D values showed strong agreement with results obtained from Holographic interferometry and Taylor dispersion methods.
The visual drifting of the diffusion image directly correlated with the diffusion rate, offering intuitive understanding.

Conclusions:

The asymmetric liquid-core cylindrical lens (ALCL) provides a viable new optical approach for measuring liquid diffusion coefficients.
This method is characterized by its visual measurement capability, simplified apparatus, and ease of operation.
The ALCL method offers a promising alternative for visual determination of liquid diffusion values.