...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Heat Transfer >Experimental and Numerical Study of Single Bubble Dynamics on a Hydrophobic Surface
【24h】

Experimental and Numerical Study of Single Bubble Dynamics on a Hydrophobic Surface

机译：疏水表面单泡动力学的实验与数值研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The growth and departure of single bubbles on two smooth surfaces with very different wettabilities are studied using high-speed video microscopy and numerical simulations. Isolated artificial cavities of approximately 10 μm diameter are microfabricated on both a bare and a Teflon-coated silicon substrate to serve as nucleation sites. The bubble departure diameter is observed to be almost 3 times larger and the growth period almost 60 times longer for the hydrophobic surface than for the hydrophilic surface. The waiting period is practically zero for the hydrophobic surface because a small residual bubble nucleus is left behind on the cavity from a previous ebullition cycle. The experimental results are consistent with our numerical simulation results. Bubble nucleation occurs on nominally smooth hydrophobic regions with root mean square roughness (R_q) less than I nm even at superheat as small as 3℃. Liquid subcooling significantly affects bubble growth on the hydrophobic surface due to increased bubble surface area. Fundamental understanding of bubble dynamics on heated hydrophobic surfaces will facilitate the development of chemically patterned surfaces with enhanced boiling heat transfer performance and novel phase-change based micro-actuators and energy harvesters.
机译：使用高速视频显微镜和数值模拟研究了两个具有不同润湿性的光滑表面上单个气泡的生长和离开。在裸露的和涂覆有特氟隆的硅基板上都微制造了直径约为10μm的隔离人工腔，以作为成核点。观察到，与亲水性表面相比，疏水性表面的气泡离开直径几乎大3倍，并且生长周期几乎长60倍。对于疏水性表面，等待时间实际上为零，因为自先前的磁化循环以来，在腔体上留下了一个小的残留气泡核。实验结果与我们的数值模拟结果一致。气泡形核发生在名义上光滑的疏水区域，即使在低至3℃的过热下，其均方根粗糙度（R_q）仍小于1 nm。由于增加的气泡表面积，液体过冷会显着影响疏水表面上的气泡生长。对加热的疏水性表面上的气泡动力学的基本了解将促进具有增强的沸腾传热性能以及新颖的基于相变的微致动器和能量收集器的化学构图表面的开发。

著录项

  • 来源
    《Journal of Heat Transfer》 |2009年第12期|121004.1-121004.7|共7页
  • 作者

    Youngsuk Nam; Jinfeng Wu; Gopinath Warrier; Y. Sungtaek Ju;

  • 作者单位

    Department of Mechanical and Aerospace Engineering, University of California,Los Angeles, CA 90095;

    Department of Mechanical and Aerospace Engineering, University of California,Los Angeles, CA 90095;

    Department of Mechanical and Aerospace Engineering, University of California,Los Angeles, CA 90095;

    Department of Mechanical and Aerospace Engineering, University of California,Los Angeles, CA 90095;

  • 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

    single bubble; hydrophobic surface; nucleate boiling; dynamics; wettability; phase change;

    机译：单泡疏水表面核沸腾;动力学;润湿性相变;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号