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首页> 外文期刊>International Journal of Heat and Mass Transfer >Visualization study of flow boiling characteristics in open microchannels with different wettability
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Visualization study of flow boiling characteristics in open microchannels with different wettability

机译：不同润湿性开放式微通道流沸腾特性的可视化研究

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摘要

Open microchannels heat sink can reduce the pressure drop and mitigate the flow instability, but the influence of wettability on the two-phase flow boiling for open microchannels configuration is unclear. In this study, open microchannels with superhydrophilic (SHPi), hydrophilic (HPi) and superhydrophobic (SHPo) properties were fabricated, respectively. Experiments were conducted to explore the heat transfer and pressure drop characteristic and visualization was carried out to analyze the connection between flow pattern transition and two-phase flow boiling performance. Tests were performed with the inlet subcooling of 75°C at efficient heat flux of 261.8-597.9 kW/m~2 under various mass flow ranging from 172 to 382 kg/m~2·s. Local dryout was captured during stratified flow for HPi microchannels, yet was absent for SHPi ones. A novel trapped bubble was observed in SHPo microchannels, which led to trapped vapor film and slug film that limited areas to be rewetted at high heat flux. SHPo microchannels with the largest quantity of nucleating sites achieved the highest heat transfer coefficient at low to medium high heat flux (222.8-446.6 kW/m~2 at C = 172 kg/m~2·s, 296.3-728.5 kW/m~2 at G = 278 kg/m~2·s, 331.7-949.8 kW/m~2 at G = 382 kg/m~2·s), however SHPi ones yielded a better performance at the highest heat flux owing to the excellent rewetting capacity. The two-phase pressure drop of open microchannels was found to be dominated by vapor acceleration loss that was related to the vaporization efficiency, thus the SHPo microchannels possessed the highest pressure drop and the SHPi ones exhibited the lowest value.
机译：打开微通道散热器可以减少压降并减轻流量不稳定，但润湿性对开放微通道配置的两相流沸腾的影响尚不清楚。在该研究中，分别制备了具有超硫酸（SHPI），亲水（HPI）和超疏水（SHPO）性质的开放微通道。进行实验以探讨传热和压降特性，进行了分析流动模式转变与两相流沸腾性能之间的连接。在各种质量流量的高效热通量下在75℃下以75℃的进样口过冷却，从172至382kg / m〜2·s的高效热通量进行测试。在HPI微通道的分层流动期间捕获了本地干源，但SHPI缺乏。在SHPO微通道中观察到一种新的被困气泡，其导致捕获的蒸汽膜和夹板膜，其限制在高热通量下重新焊接的区域。具有最大成核位点的SHPO微型通道在低至中等高热量通量下实现了最高的传热系数（222.8-446.6 kW / m〜2，C = 172 kg / m〜2·s，296.3-728.5 kW / m〜 2以g = 278 kg / m〜2·s，331.7-949.8 kW / m〜2以g = 382 kg / m〜2·s），然而，由于优秀的优秀，SHPI ONE赋予最高热通量更好的性能重新润湿能力。发现开放微通道的两相压降是由蒸发效率相关的蒸汽加速度损失的主导，因此SHPO微通道具有最高压降，SHPI呈现最低值。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第12期|121808.1-121808.13|共13页
  • 作者

    Qi Zhao; Juncheng Qiu; Jianhong Zhou; Mingxiang Lu; Qiang Li; Xuemei Chen;

  • 作者单位

    MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power Engineering Nanjing University of Science and Technology Nanjing 210094 China;

    MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power Engineering Nanjing University of Science and Technology Nanjing 210094 China;

    MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power Engineering Nanjing University of Science and Technology Nanjing 210094 China;

    MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power Engineering Nanjing University of Science and Technology Nanjing 210094 China;

    MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power Engineering Nanjing University of Science and Technology Nanjing 210094 China;

    MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power Engineering Nanjing University of Science and Technology Nanjing 210094 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Open microchannels; Visualization; Wettability; Two-phase flow boiling; Heat transfer; Pressure drop;

    机译：开放微通道;可视化;润湿性;两相流沸腾;传播热量;压力下降;

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