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首页> 外文期刊>Journal of Heat Transfer >Flow Boiling Enhancement in Microtubes With Crosslinked pHEMA Coatings and the Effect of Coating Thickness
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Flow Boiling Enhancement in Microtubes With Crosslinked pHEMA Coatings and the Effect of Coating Thickness

机译：交联pHEMA涂层在微管中流动沸腾的增强及涂层厚度的影响

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摘要

In this experimental study, flow boiling in mini/microtubes was investigated with surface enhancements provided by crosslinked polyhydroxyethylmethacrylate (pHEMA) coatings, which were used as a crosslinker coating type with different thicknesses (～50 nm, 100 nm, and 150 nm) on inner microtube walls. Flow boiling heat transfer experiments were conducted on microtubes (with inner diameters of 249 μm, 507 μm, and 908 μm) coated with crosslinked pHEMA coatings. pHEMA nanofilms were deposited with initiated chemical vapor deposition (iCVD) technique. De-ionized water was utilized as the working fluid in this study. Experimental results obtained from coated microtubes were compared to their plain surface counterparts at two different mass fluxes (5000 kg/m~2 s and 20,000 kg/m~2 s), and significant enhancements in critical heat flux (up to 29.7%) and boiling heat transfer (up to 126.2%) were attained. The enhancement of boiling heat transfer was attributed to the increase in nucleation site density and incidence of bubbles departing from surface due to porous structure of crosslinked pHEMA coatings. The underlying mechanism was explained with suction-evaporation mode. Moreover, thicker pHEMA coatings resulted in larger enhancements in both CHF and boiling heat transfer.
机译：在本实验研究中，通过交联聚甲基丙烯酸甲酯（pHEMA）涂层的表面增强作用研究了微型/微管中的沸腾现象，该涂层被用作内部厚度不同（〜50 nm，100 nm和150 nm）的交联剂涂层类型微管壁。在涂覆有交联pHEMA涂层的微管（内径为249μm，507μm和908μm）上进行沸腾传热实验。用初始化学气相沉积（iCVD）技术沉积pHEMA纳米膜。去离子水在本研究中用作工作流体。在两个不同的质量通量（5000 kg / m〜2 s和20,000 kg / m〜2 s）下，从涂覆的微管获得的实验结果与它们的平表面对应物进行了比较，临界热通量显着提高（高达29.7％），达到沸腾传热（高达126.2％）。沸腾传热的增强归因于成核位点密度的增加和由于交联pHEMA涂层的多孔结构而使气泡从表面逸出。用抽吸-蒸发模式解释了潜在的机理。此外，较厚的pHEMA涂层导致CHF和沸腾传热都有较大提高。

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  • 来源
    《Journal of Heat Transfer》 |2014年第8期|081504.1-081504.11|共11页
  • 作者

    Taha Cikim; Efe Armagan; Gozde Ozaydin Ince; Ali Kosar;

  • 作者单位

    Mechatronics Engineering Program, Faculty of Engineering Science, Orhanli - Tuzla/Istanbul 34956, Turkey;

    Material Science and Engineering Program, Faculty of Engineering Science, Orhanli - Tuzla/Istanbul 34956, Turkey;

    Material Science and Engineering Program, Faculty of Engineering Science, Orhanli - Tuzla/Istanbul 34956, Turkey;

    Mechatronics Engineering Program, Faculty of Engineering Science, Orhanli - Tuzla/Istanbul 34956, Turkey;

  • 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

    crosslinked pHEMA coating; heat transfer enhancement; flow boiling; microscale boiling;

    机译：交联的pHEMA涂料;传热增强;流沸腾微量沸腾;

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