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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental and theoretical studies of critical heat flux of flow boiling in microchannels with microbubble-excited high-frequency two-phase oscillations
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Experimental and theoretical studies of critical heat flux of flow boiling in microchannels with microbubble-excited high-frequency two-phase oscillations

机译：微泡激发高频两相振荡的微通道内沸腾临界热通量的实验和理论研究

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摘要

Critical heat flux (CHF) during flow boiling in silicon microchannels (H = 250 μm, W= 200 μm, L = 10 mm) using self-excited and self-sustained high frequency two-phase oscillations is studied both experimentally and theoretically. Tests are performed on deionized water over a mass flux range of 200-1350 kg/m~2 s. An enhanced CHF of 1020 W/cm~2 is achieved experimentally at a mass flux of 1350 kg/m~2 s in the present study. Since no existing CHF models and correlations on parallel mini/microchannels considered high frequency two-phase oscillations, hence are not applicable to predict CHF in the present microchannel configuration. Adopting Helmholtz and Rayleigh instability theories and based on experimental study of liquid thin film dry-out phenomena in two-phase oscillations, a semi-theoretical CHF model is proposed. The proposed theoretical predictions show satisfactory agreement with experimental data with a reasonable low mean absolute error (MAE) of 25-32%.
机译：在硅微通道（H = 250μm，W = 200μm，L = 10 mm）中使用自激和自持高频两相振荡进行沸腾过程中的临界热通量（CHF）进行了实验和理论研究。在去离子水中以200-1350 kg / m〜2 s的质量通量进行测试。在本研究中，通过实验在质量流量为1350 kg / m〜2 s的条件下，将CHF增强了1020 W / cm〜2。由于在并行微型/微通道上没有现有的CHF模型和相关性考虑到高频两相振荡，因此不适用于当前微通道配置中的CHF预测。采用Helmholtz和Rayleigh不稳定性理论，并基于对两相振荡中液体薄膜变干现象的实验研究，提出了半理论CHF模型。拟议的理论预测表明，与实验数据具有令人满意的一致性，合理的低平均绝对误差（MAE）为25-32％。

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  • 作者

    Wenming Li; Fanghao Yang; Tamanna Alam; Jamil Khan; Chen Li;

  • 作者单位

    Department of Mechanical Engineering. University of South Carolina, Columbia, SC 29210, United States;

    Department of Mechanical Engineering. University of South Carolina, Columbia, SC 29210, United States;

    Department of Mechanical Engineering. University of South Carolina, Columbia, SC 29210, United States;

    Department of Mechanical Engineering. University of South Carolina, Columbia, SC 29210, United States;

    Department of Mechanical Engineering. University of South Carolina, Columbia, SC 29210, United States;

  • 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

    Critical heat flux; Flow boiling; Microchannels; Jacob number; Helmholtz instability;

    机译：临界热通量;流沸腾;微通道;雅各布数亥姆霍兹不稳定性;

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