Visualization investigation of the effects of nanocavity structure on pool boiling enhancement
Visualization investigation of the effects of nanocavity structure on pool boiling enhancement
复制标题
纳米腔结构对水池沸腾增强效果的可视化研究
DOI：
10.1016/j.ijheatmasstransfer.2019.03.001
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发表时间：
2019-06
影响因子：
5.2
通讯作者：
Wang Shuangfeng
中科院分区：
文献类型：
--
作者：
Hong Sihui;Jiang Siqiang;Hu Yanxin;Dang Chaobin;Wang Shuangfeng
通过仔细控制接触表面的物理化学特性，可以大大增强沸腾传热。在这项工作中，我们利用电沉积方法制备了具有3D立方Cu2O晶体和树枝状铜分支纳米结构的增强金属表面。它们的静态接触角分别为127°和139°。此外，泡核沸腾开始时的初始温度超调从15.3K降至仅4.4K和2.9K，调节表面的最大传热系数分别提高了311.4%和389.2%。基于比较分析，明确阐明了纳米腔结构对气泡动力学和传热机制的影响。我们确定，具有互连分支结构的深纳米级空腔是促进可观的毛细管力和低渗流阻力以维持有效沸腾传热的关键因素。树枝状结构表面产生的细长气泡有效地减轻了气泡聚结并延迟了局部汽膜覆盖，从而克服了高热通量下传热恶化的缺陷。具有 3D 树枝状纳米结构层的表面可以承受高达 73.53W/cm2 的热通量而不会干燥。
Boiling heat transfer can be greatly enhanced through careful control of the physiochemical characteristics of contact surfaces. In this work, by utilizing the electrodeposition method, we prepared enhanced metallic surfaces with 3D cubic Cu2O crystals and dendritic copper branch nanostructures. Their static contact angles are 127° and 139°, respectively. Additionally, incipience temperature overshoot at the onset of nucleate boiling decreased to only 4.4 K and 2.9 K from 15.3 K, and the maximum heat transfer coefficients for the conditioned surfaces were improved by 311.4% and 389.2%, respectively. Based on comparative analysis, the effects of nanocavity structure on bubble dynamics and heat transfer mechanisms are explicitly clarified. We determined that deep nanoscale cavities with interconnected branch structures are the key factor for facilitating appreciable capillary force and low seepage resistance to maintain efficient boiling heat transfer. Slender bubbles generated from dendritic structured surfaces effectively mitigate bubble coalescence and delay local vapor film coverage, thereby overcoming the defect of heat transfer deterioration under high heat flux. A surface with a 3D dendritic nanostructured layer can withstand a heat flux up toq= 73.53 W/cm2without drying out.
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影响因子：
--
作者：
Seung-Yeol Han;Yu-Jen Chang;Doo-Hyoung Lee;S. Ryu;T. Lee;Chih-hung Chang
通讯作者：
Seung-Yeol Han;Yu-Jen Chang;Doo-Hyoung Lee;S. Ryu;T. Lee;Chih-hung Chang
影响因子：
3.2
作者：
S. Siedel;S. Cioulachtjian;J. Bonjour
通讯作者：
S. Siedel;S. Cioulachtjian;J. Bonjour
影响因子：
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作者：
M. El-Genk;Amir Ali
通讯作者：
M. El-Genk;Amir Ali
DOI：
10.1115/msec2007-31098
发表时间：
2007
期刊：
--
影响因子：
--
作者：
C. Tseng;B. Paul
通讯作者：
C. Tseng;B. Paul
DOI：
10.1016/j.expthermflusci.2017.06.007
发表时间：
2017-11-01
影响因子：
3.2
作者：
Salimpour, Mohammad Reza;Abdollahi, Ali;Afrand, Masoud
通讯作者：
Afrand, Masoud