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Bubble Dynamics in Pool Boiling on Nanoparticle-Coated Surfaces

机译：纳米颗粒涂层表面池沸腾中的气泡动力学

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摘要

This work examines bubble dynamics for saturated nucleate boiling at atmospheric pressure for pure water on a 0.62 5mm-diameter zirconium wire with nanoparticle surface coating using a high-speed camera. Pool boiling experiments were carried out on the surface-modified wires fabricated by the electrophoretic deposition process using 60- to 80-nm titanium and 60- to 80-nm titania, respectively. Critical heat flux (CHF) enhancements for pool boiling were observed up to 27% for the titanium coatings and 65% for the titania coatings compared to bare zirconium wires. At 300 kW/m~2 surface heat flux, the nucleate site density on the titanium coating and the titania coating was observed to be 47% and 45% less than the bare wire. In terms of bubble departure volume, each coating had 16% and 29% smaller volume than the bare surface, respectively. In addition, the average bubble departure frequency of each coating was 43% and 101% higher than that of the bare case. The nanoparticle surface coatings enhanced the natural and forced convection contribution to the total heat flux, whereas the latent heat contribution was reduced. Water spreading experiments on the nanoparticle-coated surfaces were carried out to investigate the surface characteristics. The significant water spreading on Ti- and TiO_2 nanoparticle-coated surface compared to on a bare Zircaloy-4 surface suggests enhanced lateral liquid transport to bubble nucleation sites due to the coating capillarity and wettability. We hypothesize that this mechanism plays important roles for boiling behavior as a function of input power and for CHF improvement.
机译：这项工作使用高速相机在直径为0.62的5mm直径锆丝上检查了纯净水在大气压下饱和核形核沸腾的气泡动力学。通过电泳沉积工艺分别使用60-80 nm的钛和60-80 nm的二氧化钛对表面改性的线材进行了池沸腾实验。与裸露的锆丝相比，钛镀层的熔池沸腾临界热通量（CHF）提高了27％，二氧化钛涂层的临界热通量提高了65％。在300 kW / m〜2的表面热通量下，观察到钛涂层和二氧化钛涂层上的核位置密度比裸线低47％和45％。就气泡离开体积而言，每个涂层的体积分别比裸露表面小16％和29％。另外，每个涂层的平均气泡离开频率分别比裸露情况高43％和101％。纳米颗粒表面涂层增强了自然和强迫对流对总热通量的贡献，而潜热贡献则降低了。进行了在纳米颗粒涂覆的表面上的水扩散实验以研究表面特性。与在裸Zircaloy-4表面上相比，在Ti和TiO_2纳米颗粒涂层表面上的大量水扩散表明，由于涂层的毛细作用和润湿性，液体向气泡成核位置的横向传输增强了。我们假设这种机制对于沸腾行为作为输入功率的函数以及对CHF的改善起着重要的作用。

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  • 来源
    《Heat Transfer Engineering》 |2015年第11期|1013-1027|共15页
  • 作者

    HWASUNG YEOM; KUMAR SRIDHARAN; MICHAEL L. CORRADINI;

  • 作者单位

    Engineering Physics and Nuclear Engineering Department, University of Wisconsin-Madison, Wisconsin, USA;

    Engineering Physics and Nuclear Engineering Department, University of Wisconsin-Madison, Wisconsin, USA;

    Engineering Physics and Nuclear Engineering Department, 1500 Engineering Drive, University of Wisconsin, Madison, WI 53706, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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