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首页> 外文期刊>International Journal of Heat and Mass Transfer >Bubble dynamics and heat transfer on a wettability patterned surface
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Bubble dynamics and heat transfer on a wettability patterned surface

机译：润湿性图案表面上的气泡动力学和传热

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摘要

In this paper we studied the enhancement of heat transfer on hydrophilic-hydrophobic patterned surface in a transparent mini chamber. Hydrophobic islands on hydrophilic networks were micro fabricated as patterns on a 1 mm × 1 mm indium-tin-oxide (ITO) glass heater. The hydrophobic islands with size of 100 μm × 100 μm and pitch distance 100 μm are self-assembled monolayers (SAM) of (1H,1H,2H,2H)-Perfluorodecyldimethylchlorosilane (FAS) with contact angle of 100°. The input heat flux for the heater ranges up to 300 W/cm~2. It is shown that the critical heat flux (CHF) on the wettability patterned surface was enhanced by 90% in comparison with a hydrophilic surface. The visualization results also show that the mechanism for enhancing heat transfer coefficient (HTC) of a wettability patterned surface is caused by increasing the active nucleation sites, decreasing the bubble departure diameter, remaining residual bubbles, and activating more bubble interactions. Patterns increase the CHF by moderating the Helmholtz instabilities, preventing the formation of an insulating vapor layer.
机译：在本文中，我们研究了在透明小室中亲水-疏水图案表面上传热的增强。在1 mm×1 mm氧化铟锡（ITO）玻璃加热器上，将亲水网络上的疏水岛微细化为图案。尺寸为100μm×100μm，节距为100μm的疏水岛是（1H，1H，2H，2H）-全氟癸基二甲基氯硅烷（FAS）的自组装单分子层（SAM），接触角为100°。加热器的输入热通量范围高达300 W / cm〜2。结果表明，与亲水性表面相比，润湿性图案化表面上的临界热通量（CHF）提高了90％。可视化结果还表明，增加可湿性图案化表面的传热系数（HTC）的机制是由于增加了活性成核位点，减小了气泡离开直径，保留了残留气泡并激活了更多的气泡相互作用。图案通过缓和亥姆霍兹不稳定性来增加CHF，从而防止形成绝缘蒸汽层。

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  • 作者

    Xiaodan Chen; Huihe Qiu;

  • 作者单位

    Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong Special Administrative Region;

    Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong Special Administrative Region;

  • 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

    Hydrophilic-hydrophobic patterns; Bubble dynamics; Controlled nucleation sites;

    机译：亲水-疏水模式;气泡动力学;受控成核位点;

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