李冰杰, 张舒蕾, 董新宇, 等. 基于双层温敏漆测温的固着液滴蒸发传热特性研究[J]. 实验流体力学, doi: 10.11729/syltlx20220132.
引用本文: 李冰杰, 张舒蕾, 董新宇, 等. 基于双层温敏漆测温的固着液滴蒸发传热特性研究[J]. 实验流体力学, doi: 10.11729/syltlx20220132.
LI B J, ZHANG S L, DONG X Y, et al. Study on evaporation heat transfer characteristics of sessile droplets based on temperature measurement of double layer temperature sensitive paint[J]. Journal of Experiments in Fluid Mechanics, doi: 10.11729/syltlx20220132.
Citation: LI B J, ZHANG S L, DONG X Y, et al. Study on evaporation heat transfer characteristics of sessile droplets based on temperature measurement of double layer temperature sensitive paint[J]. Journal of Experiments in Fluid Mechanics, doi: 10.11729/syltlx20220132.

基于双层温敏漆测温的固着液滴蒸发传热特性研究

Study on evaporation heat transfer characteristics of sessile droplets based on temperature measurement of double layer temperature sensitive paint

  • 摘要: 温敏漆测温作为新型的非接触式测温方法,具有成本低、响应快等优点。本文采用了基于双层温敏漆的测温技术以研究固着液滴蒸发的传热特性。通过双层温敏漆测温,分别得到液滴与加热基底接触面以及基底背部的温度分布,构建一维非稳态导热反问题模型,获得液滴与基底接触面处的热流密度分布。研究结果表明,液滴汽化过程可以分为三个阶段:初始加热阶段,对流单元蒸发阶段和薄膜蒸发阶段。在初始加热阶段,热流密度迅速上升。在对流单元蒸发阶段,热流密度逐渐减小后基本维持不变。在薄膜蒸发阶段,由于液膜较薄,汽化增强,热流密度先增大,随液滴即将完全蒸发,其热流密度又迅速减小。通过校核液滴蒸发换热量,验证了本文实验方法的可靠性,本文研究成果有助于拓宽相变传热热流密度的实验测量方法。

     

    Abstract: As a new non-contact temperature measurement method, temperature sensitive paint has the advantages of low cost and fast response. In this paper, a temperature measurement technology based on double layer temperature sensitive paint was used to study the heat transfer characteristics of sessile droplet evaporation. The temperature distributions at the contact surface between the droplet and the heating substrate and at the back of the substrate were obtained by measuring the temperature with a double-layer temperature sensitive paint. A one-dimensional unsteady inverse heat conduction model was established to obtain the heat flux distribution at the interface between the droplet and the heating substrate. The results show that the droplet vaporization process can be divided into three stages: initial heating stage, convection unit evaporation stage and film evaporation stage. In the initial heating stage, the heat flux increases rapidly. In the convection unit evaporation stage, the heat flux decreases gradually and remains basically unchanged. In the film evaporation stage, the heat flux first increases, and then decreases rapidly as the droplet almost completely evaporates. The reliability of the experimental method is verified by checking the heat quantity of droplet evaporation. The research results in this paper are helpful to broaden the experimental measurement method of heat flux during phase change heat transfer.

     

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