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首页> 外文期刊>International Journal of Heat and Mass Transfer >Boiling flow characteristics in microchannels with very hydrophobic surface to super-hydrophilic surface
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Boiling flow characteristics in microchannels with very hydrophobic surface to super-hydrophilic surface

机译：具有非常疏水的表面到超亲水表面的微通道中的沸腾流动特性

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摘要

Boiling flow process plays a very important role to affect the heat transfer in a microchannel. Different boiling flow modes have been found in the past which leads to different oscillations in temperatures and pressures. However, a very important issue, i.e. the surface wettability effects on the boiling flow modes, has never been discussed. The current experiments fabricated three different microchannels with identical sizes at 105 × 1000 × 30000 nm but at different wettability. The microchannels were made by plasma etching a trench on a silicon wafer. The surface made by the plasma etch process is hydrophilic and has a contact angle of 36° when measured by dipping a water droplet on the surface. The surface can be made hydrophobic by coating a thin layer of low surface energy material and has a contact angle of 103° after the coating. In addition, a vapor-liquid-solid growth process was adopted to grow nanowire arrays on the wafer so that the surface becomes super-hydrophilic with a contact angle close to 0°. Different boiling flow patterns on a surface with different wettability were found, which leads to large difference in temperature oscillations. Periodic oscillation in temperatures was not found in both the hydrophobic and the super-hydrophilic surface. During the experiments, the heat flux imposed on the wall varies from 230 to 354.9 kW/m~2 and the flow of mass flux into the channel from 50 to 583 kg/ m~2s. Detailed flow regimes in terms of heat flux versus mass flux are also obtained.
机译：沸腾过程对影响微通道中的热传递起着非常重要的作用。过去已经发现了不同的沸腾流动模式，这导致了温度和压力的不同振荡。然而，从未讨论过非常重要的问题，即表面润湿性对沸腾流动模式的影响。当前的实验制造了三个不同的微通道，它们在105×1000×30000 nm处具有相同的尺寸，但具有不同的润湿性。通过等离子蚀刻硅晶片上的沟槽来制造微通道。通过等离子体蚀刻工艺制成的表面是亲水性的，并且当通过将水滴浸在表面上进行测量时具有36°的接触角。通过涂覆低表面能材料的薄层可以使表面疏水，并在涂覆后具有103°的接触角。此外，采用汽-液-固生长工艺在晶片上生长纳米线阵列，以使表面变得超亲水，接触角接近0°。在具有不同润湿性的表面上发现了不同的沸腾流型，这导致了温度波动的巨大差异。在疏水表面和超亲水表面均未发现温度的周期性振荡。在实验过程中，施加在壁上的热通量从230到354.9 kW / m〜2不等，流入通道的质量通量从50到583 kg / m〜2s。还获得了关于热通量对质量通量的详细流态。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第3期|p.126-134|共9页
  • 作者

    Ting Y. Liu; P.L. Li; C.W. Liu; C. Gau;

  • 作者单位

    Institute of Aeronautics and Astronautics and Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 70101, Taiwan;

    Institute of Aeronautics and Astronautics and Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 70101, Taiwan;

    Department of Mechanical Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan;

    Institute of Aeronautics and Astronautics and Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 70101, Taiwan;

  • 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

    micro boiling flow; surface wettability effect; silicon nanowire surface; microchannel flow;

    机译：微沸流表面润湿作用;硅纳米线表面;微通道流;

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