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One-Dimensional Semimechanistic Model for Flow Boiling Pressure Drop in Small to Micro Passages

机译：小通道至微通道中沸腾压降的一维半力学模型

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摘要

Accurate predictions of two-phase pressure drop in small to micro-diameter passages are necessary for the design of compact and ultra-compact heat exchangers, which find wide application in process and refrigeration industries and in the cooling of electronics. A semimechanistic model of boiling two-phase pressure drop in the confined bubble regime is formulated, following the three-zone approach for heat transfer. The total pressure drop is calculated by time-averaging the pressure drops for single-phase liquid, elongated bubble with a thin liquid film, and single-phase vapor. The model results were comparedwith experimental data collected for a wide range of tube diameters (4.26, 2.88, 2.02,1.1, and 0.52 mm) for R134a at pressures of 6-12 bar. In this model's present form, its predictions are close to those of the homogeneous flow model but it provides a platform for further development.
机译：对于紧凑和超紧凑型换热器的设计，准确预测小径到微径通道中的两相压降是必要的，该换热器广泛用于过程和制冷行业以及电子产品的冷却。遵循三区传热方法，建立了密闭气泡状态下沸腾两相压降的半力学模型。通过对单相液体，带有薄液膜的细长气泡和单相蒸气的压降进行时间平均来计算总压降。将模型结果与在6-12 bar压力下针对R134a的多种管径（4.26、2.88、2.02、1.1和0.52 mm）收集的实验数据进行比较。在此模型的当前形式中，其预测与均质流模型的预测很接近，但它为进一步开发提供了平台。

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  • 来源
    《Heat Transfer Engineering》 |2011年第14期|p.1150-1159|共10页
  • 作者

    DEREJE SHIFERAW; MOHAMED MAHMOUD; TASSOS G. KARAYIANNIS; DAVID B. R. KENNING;

  • 作者单位

    Heatric Division of Meggitt Limited, Dorset, United Kingdom;

    School of Engineering and Design, Brunei University, Uxbridge, United Kingdom;

    School of Engineering and Design, Brunei University, Uxbridge, United Kingdom;

    School of Engineering and Design, Brunei University, Uxbridge, United Kingdom;

  • 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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