A two-dimensional phase interface digital processing display method based on thermochromic liquid crystal

Abstract

The invention discloses a two-dimensional phase interface digital processing display method based on thermochromic liquid crystal. The method is applied to the field of high-thermal conductivity composite phase change material heat storage. The method comprises the five steps of pixel point reading, coordinate conversion, phase interface skimming, filtering and phase interface displaying. A thermochromic liquid crystal material has the characteristics of reversible thermochromism, high temperature resolution, high space resolution and quick response, thereby realizing visual measurement of thesolid-liquid phase interface of a phase change material. Through the single value correspondence of the pixel color and temperature of the thermochromic liquid crystal, digital reading of the phase interface is realized. Through binary Taylor interpolation, the recognition of a closed phase interface curve generated under a circular heat transfer boundary condition is realized. Through the adoption of the method, the digital reading and displaying of the phase interface in the phase change process is realized on the basis of the thermochromic liquid crystal; the objectiveness of manual recognition is eliminated at a certain degree; a scientific phase interface defining, processing and displaying method is provided; and the extraction of other heat transfer parameters such as the fusion rate is facilitated.

Description

technical field [0001] The invention belongs to the field of heat storage of high thermal conductivity phase change materials, and in particular relates to a two-dimensional phase interface digital processing and display method based on thermochromic liquid crystals. Background technique [0002] Thermal energy not only widely exists in nature in the form of solar energy and geothermal energy, but also is produced in low-grade forms in high-energy industries such as iron and steel metallurgy, cement building materials, and petrochemical industries. Therefore, if thermal energy can be effectively stored and utilized, it is an effective means to realize energy source and improve utilization rate. [0003] Solid-liquid phase change materials have the advantages of low cost, constant temperature during heat storage and heat release, small thermal expansion rate, stable physical and chemical properties, etc., and are widely used in the field of heat storage. Although the energy ...

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Problems solved by technology

[0004] However, in the study of the actual heat transfer performance of the composite phase change material in the heat storage cavity, it was found that the addition of nanoparticles made the solid-liquid two-phase interface of the composite phase change material during the melting / solidification process invisible, so it was impossible to use traditional direct observation. A visualization method to determine the phase interface position and quantitatively analyze the heat transfer performance of the thermal storage cavity

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