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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Influence of two-phase flow characteristics on critical heat flux in low pressure
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Influence of two-phase flow characteristics on critical heat flux in low pressure

机译：两相流特性对低压临界热通量的影响

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摘要

In the present study, the critical heat flux (CHF) was measured over wide quality range from subcooled boiling to annular-mist flow at the atmospheric pressure. At a low pressure around the atmospheric pressure, the two-phase flow pattern and void fraction changes easily along the heated length and the flow becomes more complex due to the low density of gas phase. By using Pyrex glass tube as a test channel installed with a heater rod at the centerline, the two-phase flow situation was observed visually. The flow pattern was kept nearly constant over the length of test section due to the low power input into the fluid. Therefore, the characteristics of CHF could be investigated at each flow patterns of bubbly, slug, annular and annular-mist flow. In the subcooled boiling region of bubbly flow, the CHF decreased with increase of quality and was less sensitive to flow rate. In the slug flow region, the CHF showed a minimum value. With more increase of quality in the annular flow, the CHF increased and reached a peak value at a certain quality depending on flow rate. The peak of CHF occurred almost at a constant vapor mass velocity. In the annular-mist flow region, the CHF decreased with increase of quality. In the region, the effect of heated length on the CHF was systematically measured and validity of an analytical model of CHF considering dryout of liquid was investigated.
机译：在本研究中，在大气压下从过冷沸腾到环形雾流的较宽质量范围内测量了临界热通量（CHF）。在大气压附近的低压下，两相流型态和空隙率很容易沿加热长度变化，并且由于气相密度低，流动变得更加复杂。通过使用派热克斯玻璃管作为在中心线安装有加热棒的测试通道，目视观察到两相流动情况。由于输入到流体的功率低，在测试部分的整个长度上，流型几乎保持恒定。因此，可以在气泡状，团状，环状和环状薄雾流的每种流动模式下研究CHF的特性。在气泡流的过冷沸腾区域中，CHF随质量的增加而降低，并且对流速不敏感。在团状流区域中，CHF显示最小值。随着环形流质量的增加，CHF随流速的增加而以一定质量达到峰值。 CHF的峰几乎在恒定的蒸汽质量速度下出现。在环形雾流区域，CHF随着质量的增加而降低。在该区域，系统地测量了加热长度对CHF的影响，并研究了考虑液体变干的CHF分析模型的有效性。

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