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Effects of the Thickness of Boundary Layer on Droplet's Evaporation Rate

机译：边界层厚度对液滴蒸发速率的影响

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摘要

The evaporation rate of a droplet was explained in relation to the thickness of the boundary layer and the condition near the droplet's surface. However, the number of results obtained from experiments is very limited. This study aims to investigate the thickness of the boundary layer of an ethanol-water mixture droplet and its effect on the evaporation rate by Z-type Schlieren visualization. Single and double droplets are tested and compared to identify the effect of the second droplet on the average and instantaneous evaporation rate. The double droplet's lifetime is found to be longer than the single droplet's lifetime. The formation of a larger vapor region on the top of the droplet indicates a higher instantaneous evaporation rate. The thickness of the boundary layer is found to increase with increase in ethanol concentration. Furthermore, a larger vapor distribution area is found in the case of higher ethanol concentration, which explains the faster evaporation rate at higher ethanol concentration. (C) 2020 Society for Imaging Science and Technology.
机译：关于边界层的厚度和液滴表面附近的条件，解释了液滴的蒸发速率。然而，从实验中获得的结果数量非常有限。本研究旨在研究乙醇 - 水混合物液滴的边界层的厚度及其对Z型Schlieren可视化对蒸发速率的影响。测试单一和双液滴，并比较以识别第二液滴对平均和瞬时蒸发速率的影响。发现双液滴的寿命长于单滴的寿命。液滴顶部的较大蒸汽区的形成表示瞬时蒸发速率较高。发现边界层的厚度随着乙醇浓度的增加而增加。此外，在更高的乙醇浓度的情况下发现较大的蒸汽分布区域，其解释了更高的乙醇浓度下的更快的蒸发速率。 （c）2020年影像科技协会。

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  • 来源
    《Journal of Imaging Science and Technology》 |2020年第5期|050402.1-050402.11|共11页
  • 作者

    Jonglearttrakull P.; Fushinobu K.; Kadonaga M.;

  • 作者单位

    Tokyo Inst Technol Sch Engn Dept Mech Engn 2-12-1 Ookayama Meguro Tokyo 1528550 Japan;

    Tokyo Inst Technol Sch Engn Dept Mech Engn 2-12-1 Ookayama Meguro Tokyo 1528550 Japan;

    Tokyo Inst Technol Sch Engn Dept Mech Engn 2-12-1 Ookayama Meguro Tokyo 1528550 Japan|Ricoh Co Ltd Business Strategy Dept Integrated Prod Strategy Planning Sect Ohta Ku 1-3-6 Nakamagome Tokyo 1438555 Japan;

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