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首页> 外文期刊>Journal of Heat Transfer >Combined Visualization and Heat Transfer Measurements for Steam Flow Condensation in Hydrophilic and Hydrophobic Mini-Gaps
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Combined Visualization and Heat Transfer Measurements for Steam Flow Condensation in Hydrophilic and Hydrophobic Mini-Gaps

机译：疏水和疏水微型间隙中蒸汽流动冷凝的可视化和传热组合测量

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摘要

Condensation enhancement was investigated for flow condensation in mini-channels. Simultaneous flow visualization and heat transfer experiments were conducted in 0.952-mm diameter mini-gaps. An open loop steam apparatus was constructed for a mass flux range of 50-100 kg/m~2s and steam quality range of 0.2-0.8, and validated with single-phase experiments. Filmwise condensation was observed in the hydrophilic mini-gap; pressure drop and heat transfer coefficients were compared to the (Kim and Muda-war, 2013, "Universal Approach to Predicting Heat Transfer Coefficient for Condensing Mini/Micro-Channel Flow," Int. J. Heat Mass Transfer, 56(1-2), pp. 238-250) correlation and prediction was very good; the mean absolute error (MAE) was 20.2%. Dropwise condensation was observed in the hydrophobic mini-gap, and periodic cycles of droplet nucleation, coalescence, and departure were found at all mass fluxes. Snapshots of six typical sweeping cycles were presented, including integrated flow visualization quantitative and qualitative results combined with heat transfer coefficients. With a fixed average steam quality (x = 0.42), increasing mass flux from 50 to 75 to 100kg/m~2s consequently reduced average sweeping periods from 28 to 23 to 17 ms and reduced droplet departure diameters from 13.7 to 12.9 to 10.3 μm, respectively. For these cases, condensation heat transfer coefficients increased from 154,700 to 176,500 to 194,800 W/m~2 K at mass fluxes of 50, 75, and 100kg/m~2 s, respectively. Increased mass fluxes and steam quality reduced sweeping periods and droplet departure diameters, thereby reducing liquid thickness and increasing heat transfer coefficients.
机译：对于小通道中的流动冷凝，对冷凝增强进行了研究。在直径0.952毫米的微型间隙中进行了同时的流动可视化和传热实验。构造了一种开环式蒸汽装置，其质量通量范围为50-100 kg / m〜2s，蒸汽质量范围为0.2-0.8，并通过单相实验进行了验证。在亲水性小间隙中观察到膜状冷凝；将压降和传热系数与（Kim和Muda-war，2013年，“预测冷凝微型/微通道流的传热系数的通用方法”，Int。J.传热质量，56（1-2）比较） ），第238-250页）的相关性和预测非常好；平均绝对误差（MAE）为20.2％。在疏水性微型间隙中观察到逐滴冷凝，并且在所有质量通量下都发现了液滴成核，聚结和脱离的周期性循环。给出了六个典型扫掠周期的快照，包括集成的流动可视化定量和定性结果以及传热系数。在固定平均蒸汽质量（x = 0.42）的情况下，将质量通量从50增大到75kg / m〜2s至100kg / m〜2s，从而将平均吹扫时间从28 ms减小到了23 ms至17 ms，并将液滴离开直径从13.7减小到12.9μm，分别。对于这些情况，在质量通量分别为50、75和100kg / m〜2 s时，冷凝传热系数从154,700增加到176,500 W / m〜2K。质量通量和蒸汽质量的增加减少了吹扫时间和液滴离开直径，从而减小了液体厚度并增加了传热系数。

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  • 来源
    《Journal of Heat Transfer》 |2016年第9期|091503.1-091503.11|共11页
  • 作者

    Xi Chen; Melanie M. Derby;

  • 作者单位

    Department of Mechanical and Nuclear Engineering, Kansas State University, Manhattan, KS 66506;

    Department of Mechanical and Nuclear Engineering, Kansas State University, Manhattan, KS 66506;

  • 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
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