Effect of the inclination angles of the capillary tube on the natural evaporation of absolute ethanol

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL Experimental Thermal and Fluid Science Pub Date : 2024-08-30 DOI:10.1016/j.expthermflusci.2024.111302
{"title":"Effect of the inclination angles of the capillary tube on the natural evaporation of absolute ethanol","authors":"","doi":"10.1016/j.expthermflusci.2024.111302","DOIUrl":null,"url":null,"abstract":"<div><p>Microchannel heat transfer plays an important role in microelectronics technology for heat dissipation, due to its high efficiency and low heat transfer temperature difference and flow resistance. To underpin the fundamental understanding of this technology, the natural evaporation process of absolute ethanol in a capillary tube at inclination angles ranging from 0° to 90° was investigated experimentally by exploring a spectrum of properties, such as Marangoni flow patterns, evaporation rate, heat flux, and temperature distribution. We found that the morphology of the meniscus is similar under different inclination angles, but the liquid and the tube wall slip to varying degrees due to the pressure difference at the liquid–vapor interface during evaporation. Therefore, the force distribution of the meniscus interface is different, and the resultant force is <em>F<sub>max</sub></em><sub>(60°)</sub> &gt; <em>F<sub>max</sub></em><sub>(0°)</sub> &gt; <em>F<sub>max</sub></em><sub>(30°)</sub> &gt; <em>F<sub>max</sub></em><sub>(90°)</sub>. We found that the morphology of the meniscus is independent of the inclination angle when absolute ethanol evaporates naturally. And the evaporation rate, heat flux and temperature distribution of meniscus at the initial stage of evaporation follow the law of resultant force distribution. That is, when the inclination angle is 60°, the evaporation rate and heat flux reach the maximum, i.e. 1.64 μm/s and 10.96 W/cm<sup>2</sup>, respectively, and the temperature between the center of the meniscus and the wedge region reaches 1.5 ℃. We used μ-PIV to observe the Marangoni vortex morphology of the vertical section of the meniscus, and found that there are different degrees of deformation at different inclination angles. When the inclination angle is 90°, the Marangoni vortex structure is destroyed.</p></div>","PeriodicalId":12294,"journal":{"name":"Experimental Thermal and Fluid Science","volume":null,"pages":null},"PeriodicalIF":2.8000,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Experimental Thermal and Fluid Science","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0894177724001717","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0

Abstract

Microchannel heat transfer plays an important role in microelectronics technology for heat dissipation, due to its high efficiency and low heat transfer temperature difference and flow resistance. To underpin the fundamental understanding of this technology, the natural evaporation process of absolute ethanol in a capillary tube at inclination angles ranging from 0° to 90° was investigated experimentally by exploring a spectrum of properties, such as Marangoni flow patterns, evaporation rate, heat flux, and temperature distribution. We found that the morphology of the meniscus is similar under different inclination angles, but the liquid and the tube wall slip to varying degrees due to the pressure difference at the liquid–vapor interface during evaporation. Therefore, the force distribution of the meniscus interface is different, and the resultant force is Fmax(60°) > Fmax(0°) > Fmax(30°) > Fmax(90°). We found that the morphology of the meniscus is independent of the inclination angle when absolute ethanol evaporates naturally. And the evaporation rate, heat flux and temperature distribution of meniscus at the initial stage of evaporation follow the law of resultant force distribution. That is, when the inclination angle is 60°, the evaporation rate and heat flux reach the maximum, i.e. 1.64 μm/s and 10.96 W/cm2, respectively, and the temperature between the center of the meniscus and the wedge region reaches 1.5 ℃. We used μ-PIV to observe the Marangoni vortex morphology of the vertical section of the meniscus, and found that there are different degrees of deformation at different inclination angles. When the inclination angle is 90°, the Marangoni vortex structure is destroyed.

查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
毛细管倾角对绝对乙醇自然蒸发的影响
微通道传热具有效率高、传热温差和流动阻力小的特点,在微电子技术的散热中发挥着重要作用。为了从根本上理解这项技术,我们通过实验研究了绝对乙醇在毛细管中从 0° 到 90° 倾角的自然蒸发过程,探索了一系列特性,如马兰戈尼流型、蒸发率、热通量和温度分布。我们发现,不同倾角下的半月板形态相似,但在蒸发过程中,由于液汽界面的压力差,液体和管壁会发生不同程度的滑移。因此,半月板界面的力分布是不同的,所产生的力分别为 Fmax(60°) > Fmax(0°) > Fmax(30°) > Fmax(90°)。我们发现,当绝对乙醇自然蒸发时,半月板的形态与倾角无关。而且蒸发初期半月板的蒸发速率、热通量和温度分布都遵循结果力分布规律。即当倾角为 60°时,蒸发速率和热通量达到最大值,分别为 1.64 μm/s 和 10.96 W/cm2,半月板中心与楔形区域之间的温度达到 1.5 ℃。我们使用 μ-PIV 观察了半月板垂直部分的马兰戈尼涡旋形态,发现在不同的倾角下有不同程度的变形。当倾角为 90°时,马兰戈尼涡旋结构被破坏。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
期刊最新文献
Editorial Board The oscillation of a falling ferrofluid droplet induced by a nonuniform magnetic field Effect of leaflet shape on the left ventricular blood flow pattern in BMHVs Lagrangian analysis of fluid transport in pulsatile post-stenotic flows Implementation of a high-frequency phosphor thermometry technique to study the heat transfer of a single droplet impingement
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1