A device and method for measuring the interdiffusion coefficient of a binary solution

Abstract

A device and method for measuring the interdiffusion coefficient of a binary solution are provided. A good interface of different liquids can be formed by an experiment main body of the device, defects of diffusion main body preparation in the prior art are overcome, and the measurement precision is increased. According to the method, products of interdiffusion coefficients and time are determinedby fitting object light phase curves, and the interdiffusion coefficient is determined by utilizing a linear relation between the products and the diffusion time. The method can effectively avoid problems existing in present image processing methods, such as a problem that positions of extreme points and positions of solution interfaces before diffusion are difficult to determine accurately, anda problem that data processing processes are complex because the interdiffusion coefficient and the initial diffusion time point are obtained simultaneously by fitting a plurality of concentration curves. The interdiffusion coefficient measuring precision is significantly increased and experiment intensity is reduced.

Description

Technical field [0001] The invention belongs to the technical field of fluid thermophysical property measurement, and relates to a device and method suitable for measuring the mutual diffusion coefficient of a binary solution. Background technique [0002] Diffusion phenomenon is the thermal movement of molecules, which results in the movement of macroscopic mass under the action of a certain potential difference (such as concentration difference, temperature difference, pressure difference, etc.). The phenomenon of diffusion not only exists in daily life, but also exists in many fields such as energy, chemical industry, industrial safety, and medical treatment. Such as: the diffusion of electrolytes in the solution, the diffusion between the extractant and the target substance, the leakage and diffusion of toxic gases, the diffusion of protein molecules and trace elements in human blood, etc. The study of diffusion phenomena helps to make better use of diffusion to optimize the...

AI Technical Summary

Problems solved by technology

However, the existing laser interferometric interdiffusion coefficient measurement methods still have deficiencies in the diffusion body, filling process, holographic interferometric image processing, etc., and the measurement accuracy needs to be further improved

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