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三相线钉扎的大液滴蒸发实验

赵栋栋 朱志强 刘秋生 秦军 陶跃群

赵栋栋, 朱志强, 刘秋生, 秦军, 陶跃群. 三相线钉扎的大液滴蒸发实验[J]. 空间科学学报, 2022, 42(2): 264-269. doi: 10.11728/cjss2022.02.210123035
引用本文: 赵栋栋, 朱志强, 刘秋生, 秦军, 陶跃群. 三相线钉扎的大液滴蒸发实验[J]. 空间科学学报, 2022, 42(2): 264-269. doi: 10.11728/cjss2022.02.210123035
ZHAO Dongdong, ZHU Zhiqiang, LIU Qiusheng, QIN Jun, TAO Yuequn. Experimental Investigation of Large Sessile Droplet Evaporation with Pinned Triple Line (in Chinese). Chinese Journal of Space Science, 2022, 42(2): 264-269. DOI: 10.11728/cjss2022.02.210123035
Citation: ZHAO Dongdong, ZHU Zhiqiang, LIU Qiusheng, QIN Jun, TAO Yuequn. Experimental Investigation of Large Sessile Droplet Evaporation with Pinned Triple Line (in Chinese). Chinese Journal of Space Science, 2022, 42(2): 264-269. DOI: 10.11728/cjss2022.02.210123035

三相线钉扎的大液滴蒸发实验

doi: 10.11728/cjss2022.02.210123035
基金项目: 国家自然科学基金项目资助(U1738119,11532015)
详细信息
    作者简介:

    赵栋栋:E-mail:zhaodongdong@imech.ac.cn

    通讯作者:

    朱志强,E-mail:zhuzhiqiang@imech.ac.cn

  • 中图分类号: V524

Experimental Investigation of Large Sessile Droplet Evaporation with Pinned Triple Line

  • 摘要: 利用实践十号返回式科学实验卫星蒸发对流箱,开展了三相线处于钉扎状态且接触半径大于毛细长度的无水乙醇大滴在加热PTFE表面蒸发的地基科学实验。实验发现,液滴体积随时间线性递减,但钉扎大液滴蒸发过程中没有出现恒定接触角(CCA)阶段。与小液滴蒸发的恒定接触半径(CCR)阶段相同,大液滴的平均蒸发速率也与初始体积无关,表明受重力影响明显的大液滴蒸发主要发生在三相线附近区域。瞬时蒸发速率经历了迅速上升和之后的长时间内保持稳定两个阶段。与数值模拟结果对比分析发现,准静态扩散模型低估了三相线处于钉扎状态的大液滴瞬时蒸发速率,而同时考虑蒸气扩散与空气中自然对流经验模型的准确性取决于实验所用工质。

     

  • 图  1  附壁液滴蒸发实验系统

    Figure  1.  Experimental setup of sessile droplet evaporation

    图  2  液滴蒸发三个阶段

    Figure  2.  Three stages during sessile droplet evaporation

    图  3  体积$ V $、接触半径$ R $、接触角$ \theta $ 随时间的演化过程($ {V}_{0}=95.5\;\text{µ}\mathrm{L} $

    Figure  3.  Droplet volume, contact radius and contact angle evolution when $ {V}_{0}=95.5\;\text{µ}\mathrm{L} $

    图  4  三相线钉扎状态下不同体积(V0)的液滴蒸干时间tf

    Figure  4.  Dependence of $ {t}_{\mathrm{f}} $ on $ {V}_{0} $ when triple line is pinned (the straight line represents a linear fit)

    图  5  瞬时蒸发速率的实验与理论结果对比

    Figure  5.  Comparison of experiment and model prediction of instant evaporation rate evolution

    表  1  无水乙醇物性参数($ {T}_{\mathrm{a}}=20.0 $℃,$ {p}_{\mathrm{a}}=0.101325\;\mathrm{M}\mathrm{P}\mathrm{a} $

    Table  1.   Physical properties of ethanol ($ {T}_{\mathrm{a}}=20.0 $℃, $ {p}_{\mathrm{a}}=0.101325\;\mathrm{M}\mathrm{P}\mathrm{a} $)

    LiquidDensity
    $ \rho $/($ \mathrm{k}\mathrm{g}\cdot {\mathrm{m}}^{-3} $)
    Dynamic viscosity
    $ \mu $/($ \mathrm{P}\mathrm{a}\cdot \mathrm{s} $)
    Diffusion coefficient
    $ D $/($ {\mathrm{m}\mathrm{m}}^{2}\cdot {\mathrm{s}}^{-1} $)
    Capillary length
    $ {L}_{\mathrm{c}} $/$ \mathrm{m}\mathrm{m} $
    Saturated vapor pressure
    $ {p}_{\mathrm{s}\mathrm{a}\mathrm{t}} $/$ \mathrm{P}\mathrm{a} $
    Ethanol7801.3$ \times {10}^{-3} $131.75812
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-03-22
  • 录用日期:  2021-05-11
  • 修回日期:  2021-12-30
  • 网络出版日期:  2022-05-25

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