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首页> 外文期刊>Journal of Heat Transfer >Effect of Heat Flux on Bubble Coalescence Phenomena and Sound Signatures During Pool Boiling
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Effect of Heat Flux on Bubble Coalescence Phenomena and Sound Signatures During Pool Boiling

机译：热通量对池沸腾过程中泡泡聚结现象和声音签名的影响

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摘要

Boiling heat transfer is extensively used in various industrial applications to efficiently dissipate a large amount of heat by maintaining low surface to fluid temperature differences. The maximum heat flux dissipated during boiling is limited by the critical heat flux (CHF). Difficulties in visualizing the boiling process and monitoring surface temperature make it difficult to identify the impending CHF condition. As a result, larger factors of safety are employed, and the equipment is operated at considerably lower heat fluxes. This study focuses on identifying acoustic signatures of different nucleate boiling regimes. The bubble nucleation and coalescence along with bubble collapse lead to variation in acoustic emission patterns during boiling. In this work, acoustic signatures representative of the impending CHF condition are identified during pool boiling of water over plain and enhanced copper substrates. It was observed that sound was dominant in two frequency regions (400-500 Hz dominant throughout the nucleate boiling, and 100-200 Hz dominant at heat fluxes > 100 W/cm2). However, just before CHF, a sudden drop in amplitude was observed in the high frequency region (400-500 Hz), while the amplitude in low frequency region (100-200Hz) continued to rise. This combination of the amplitude trend has potential to predict the approaching CHF condition. This is the first study that correlates high-speed images with the acoustic trends at different stages of nucleate boiling and compares experimental frequency with Minnaert frequency for coalescing bubbles.
机译：在各种工业应用中，沸腾的热传递广泛用于各种工业应用，以通过将低表面维持到流体温度差异而有效地消散大量的热量。在沸腾期间散发的最大热量通量受到临界热通量（CHF）的限制。可视化沸腾过程和监测表面温度的困难使得难以识别即将判定的CHF条件。结果，采用了较大的安全因素，并且设备以相当低的热量通量操作。本研究侧重于识别不同核心沸腾制度的声学签名。泡沫成核和聚结以及泡泡坍塌导致沸腾过程中声发射图案的变化。在这项工作中，在普通型和增强的铜基板的水沸腾期间，鉴定了代表即将结合的CHF条件的声学签名。观察到，声音在两个频率区域中占主导地位（在整个核心沸腾的400-500 Hz显性，100-200Hz在热通量下显着> 100W / cm 2）。然而，就在CHF之前，在高频区域（400-500Hz）中观察到突然的幅度，而低频区域（100-200Hz）的幅度继续上升。幅度趋势的这种组合具有预测接近CHF条件的可能性。这是第一项研究，将高速图像与核心沸腾的不同阶段相关联，并将实验频率与Minnapt频率进行比较，以聚结气泡。

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  • 来源
    《Journal of Heat Transfer》 |2021年第5期|051601.1-051601.13|共13页
  • 作者

    Akshat Negi; Aniket M. Rishi; Satish G. Kandlikar;

  • 作者单位

    Mechanical Engineering Department Rochester Institute of Technology 76 Lomb Memorial Dr. Rochester NY 14623;

    Microsystems Engineering Department Rochester Institute of Technology 76 Lomb Memorial Dr. Rochester NY 14623;

    Mechanical Engineering Department Microsystems Engineering Department Rochester Institute of Technology 76 Lomb Memorial Dr. Rochester NY 14623;

  • 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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