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Experimental Study on Subcooled Flow Boiling in Horizontal Microtubes and Effect of Heated Length

机译：水平微管中过冷沸腾的实验研究及加热长度的影响

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摘要

In this study, subcooled flow boiling was investigated in horizontal microtubes. Experiments were conducted using deionized water as the working fluid over a mass flux range of 4000-7000 kg m~(-2)s~(-1) in micro-tubes with inner and outer diameters of ~600 and ~900 µm, respectively. Microtubes with lengths of 3, 6, and 12 cm were tested to clarify the effect of heated length on flow boiling heat transfer and pressure drop characteristics. A force analysis related to two-phase flow was conducted to understand the effect of forces on bubble dynamics. Pressure drop and heat transfer data in flow boiling were acquired. Experimental heat flux data were compared with partial boiling heat flux correlations, and good agreements were obtained. Pressure drop was larger in longer microtubes in comparison to shorter ones, while higher heat fluxes were obtained in shorter microtubes at the same wall superheat. Two-phase heat transfer coefficient increased with the microtube length due to lower temperature difference between wall temperature and bulk fluid temperature in longer microtubes. Higher heat fluxes achieved in shorter microtubes at the same wall superheat imply higher critical heat fluxes in shorter microtubes.
机译：在这项研究中，研究了水平微管中的过冷流动沸腾。使用去离子水作为工作流体，在内径和外径分别为〜600和〜900 µm的微管中，在4000-7000 kg m〜（-2）s〜（-1）的质量通量范围内进行了实验。测试了长度分别为3、6和12厘米的微管，以阐明加热长度对流动​​沸腾传热和压降特性的影响。进行了与两相流有关的力分析，以了解力对气泡动力学的影响。获得了流动沸腾中的压降和传热数据。将实验热通量数据与部分沸腾热通量相关性进行了比较，并获得了良好的一致性。与较短的微管相比，较长的微管中的压降更大，而在相同的壁过热条件下，较短的微管中可获得更高的热通量。两相传热系数随微管长度的增加而增加，这是由于较长微管中壁温和体液温度之间的温差较小。在相同壁过热情况下，在较短的微管中获得的较高热通量意味着较短的微管中的较高临界热通量。

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  • 来源
    《Heat Transfer Engineering》 |2017年第4期|313-322|共10页
  • 作者

    Abdolali Khalili Sadaghiani; Ali Kosar;

  • 作者单位

    Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul, Turkey;

    Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul, Turkey;

  • 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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