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

IF 0.6 4区计算机科学 Q4 IMAGING SCIENCE & PHOTOGRAPHIC TECHNOLOGY

Journal of Imaging Science and Technology Pub Date : 2020-09-01 DOI:10.2352/j.imagingsci.technol.2020.64.5.050402

P. Jonglearttrakull, K. Fushinobu, M. Kadonaga

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引用次数: 1

Abstract

Abstract 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.

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边界层厚度对液滴蒸发速率的影响

摘要液滴的蒸发速率与边界层的厚度和液滴表面附近的条件有关。然而，从实验中获得的结果数量非常有限。本研究旨在通过Z型纹影成像研究乙醇-水混合物液滴边界层的厚度及其对蒸发速率的影响。测试并比较单液滴和双液滴，以确定第二液滴对平均蒸发速率和瞬时蒸发速率的影响。发现双液滴的寿命比单液滴的生命长。在液滴顶部形成较大的蒸汽区域表示较高的瞬时蒸发速率。发现边界层的厚度随着乙醇浓度的增加而增加。此外，在乙醇浓度较高的情况下，发现了较大的蒸汽分布面积，这解释了在乙醇浓度较高时蒸发速率较快的原因。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Imaging Science and Technology 工程技术-成像科学与照相技术

CiteScore

2.00

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： Typical issues include research papers and/or comprehensive reviews from a variety of topical areas. In the spirit of fostering constructive scientific dialog, the Journal accepts Letters to the Editor commenting on previously published articles. Periodically the Journal features a Special Section containing a group of related— usually invited—papers introduced by a Guest Editor. Imaging research topics that have coverage in JIST include: Digital fabrication and biofabrication; Digital printing technologies; 3D imaging: capture, display, and print; Augmented and virtual reality systems; Mobile imaging; Computational and digital photography; Machine vision and learning; Data visualization and analysis; Image and video quality evaluation; Color image science; Image archiving, permanence, and security; Imaging applications including astronomy, medicine, sports, and autonomous vehicles.