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Numerical investigation on the heat transfer characteristics of unstable steam jet under different operating conditions

机译：不同操作条件下不稳定蒸汽喷射传热特性的数值研究

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摘要

Transient numerical study was performed to investigate the characteristics of interphase heat transfer in unstable steam jet under different operating conditions. Bubble radius change rate, interfacial heat transfer coefficient and overall condensation mass flux reached their maximum values during the bubble necking stage. The maximum peak value of interfacial heat transfer coefficient and bubble radius change rate decreased with the decrease of inlet pressure differential and water subcooling. The peak values of interfacial heat transfer coefficient and internal velocity were found in the bubble neck region. The effect of interphase heat transfer on bubble growth and necking stages was analyzed on the basis of overall force balance. Momentum force played a major role during the bubble growth stage, and the condensation force had a dominant effect on bubble necking stage. Condensation force first decreased and reached its minimum value during bubble rapid necking stage. Subsequently, the condensation force rapidly increased and promoted the movement of bubble necking. Moreover, the condensation force curves under different conditions had the same change law.
机译：进行瞬态数值研究以研究不同操作条件下不稳定蒸汽射流中相互传热的特性。气泡半径变化率，界面传热系数和整体冷凝质量磁通量在气泡缩放阶段期间达到其最大值。随着入口压差和水过量冷却的降低，界面传热系数和气泡半径变化率的最大峰值降低。在气泡颈部区域发现界面传热系数和内速度的峰值。在总体力平衡的基础上分析了间歇传热对气泡生长和颈级的影响。动量力在泡沫生长阶段期间发挥了重要作用，并且凝结力对泡颈阶段具有显着效果。冷凝力首先在泡沫快速缩放阶段期间降低并达到其最小值。随后，冷凝力迅速增加并促进气泡缩放的运动。此外，不同条件下的冷凝力曲线具有相同的变化法。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第12期|121761.1-121761.12|共12页
  • 作者

    Shilin Song; Quanbin Zhao; Daotong Chong; Weixiong Chen; Junjie Yan;

  • 作者单位

    Stare Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 PR China;

    Stare Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 PR China;

    Stare Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 PR China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 PR China;

    Stare Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 PR China;

    Stare Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 PR China;

  • 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

    Numerical Simulation; Steam Bubble Condensation; Interfacial Heat Transfer; Force Analysis;

    机译：数值模拟;蒸汽泡凝结;界面传热;力分析;

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