A kind of condensation heat transfer transient measurement device and method based on thermochromic liquid crystal

Abstract

The invention discloses a condensation heat transfer transient measurement device and method based on thermochromic liquid crystals, belonging to the field of condensation experiment measurement. The measuring device includes an environmental cavity, a heat transfer measurement module and a data acquisition system, wherein the environmental cavity provides a stable and visualized steam condensation environment, and the heat transfer measurement module is used to realize transient non-intrusive measurement of condensation heat transfer, including Test surface, back thermochromic liquid crystal coating, side thermochromic liquid crystal coating, transparent cooling block, transparent water cooling plate, transparent heat insulation layer and cooling water heat insulation layer; data acquisition is used for image, data collection, recording and analysis . This device obtains the transient temperature distribution of the transparent cooling block and the test surface through the color change of the thermochromic liquid crystal coating during the condensation process, and then calculates the condensation heat flux and supercooling degree, which can be used for different working conditions and different characteristics of the surface. Quantitative analysis and visualization of transient properties of average or localized condensation heat transfer.

Description

technical field [0001] The invention relates to a condensation heat transfer transient measurement device and method based on thermochromic liquid crystals, belonging to the field of condensation experiment measurement. Background technique [0002] Condensation heat transfer of steam is a common phase change heat transfer process in industry. Enhancing steam condensation heat transfer can realize energy saving and emission reduction, and reduce resource consumption. Regulating the physical and chemical properties of the condensation surface is an important way to enhance condensation heat transfer. In order to study the condensation heat transfer performance (condensation heat transfer coefficient or heat flux) of different surfaces under different working conditions, it is necessary to build a stable and reliable condensation heat transfer system. Thermal testing device. [0003] The common condensation heat transfer test devices in the current research are mainly aimed ...

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Problems solved by technology

Different from the traditional hydrophobic surface, the condensed droplets on the superhydrophobic surface have the characteristics of small detachment radius, high detachment frequency, variable growth mode, and complex dynamic behavior. Study on the Influence of Condensation Heat Transfer Performance

In addition, the above two test devices generally have the problem of large errors in calculating the condensation heat transfer coefficient for low heat flux conditions (such as low-pressure steam condensation, steam condensation with non-condensable gas, etc.)

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