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首页> 外文期刊>International Journal of Heat and Mass Transfer >Study of the film boiling heat transfer and two-phase flow interface behavior using image processing
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Study of the film boiling heat transfer and two-phase flow interface behavior using image processing

机译：使用图像处理研究薄膜沸腾传热和两相流界面行为

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摘要

In the current study, based on a small-scale quench test facility, the two-phase flow interface behavior during quench transients is visualized and analyzed utilizing an image processing framework. The high-fidelity experimental results obtained for two-phase flow in the current framework can support various studies both in the time domain and in the frequency domain. In particular, visualization of the data obtained from different heating surfaces under different test conditions are used to perform a full-scale transient 2-D vapor film reconstruction. The liquid-vapor interface variations in various heat transfer regimes as well as at the initial film breakup point can be directly obtained through the processed data. Moreover, the temporal variation of the interfacial wave frequency approaching quench is investigated in detail. Based on the high-resolution data obtained for the liquid-vapor interface, the detailed phase velocity and temperature profiles are obtained through theoretic analysis, based on which the film boiling heat transfer coefficient (HTC) can be determined. In addition, an improved film boiling HTC model is developed considering the effects of wall superheat, liquid subcooling temperature, vapor film thickness as well as fluid properties. The model is found to predict film boiling HTC well within 15% error.
机译：在本前研究中，基于小型淬火测试设施，利用图像处理框架可视化和分析淬火瞬变期间的两相流动接口行为。在当前框架中为两相流获得的高保真实验结果可以支持时域和频域中的各种研究。特别地，在不同的测试条件下从不同的加热表面获得的数据的可视化用于执行全尺度瞬态2-D蒸气膜重建。可以通过处理数据直接获得各种传热调节以及初始膜分解点的液体蒸汽界面变化。此外，详细研究了界面波频率接近淬火的时间变化。基于对液体蒸汽界面获得的高分辨率数据，通过理论分析获得了详细的相速度和温度曲线，基于可以确定薄膜沸腾传热系数（HTC）。此外，考虑到壁过热，液体过冷温，蒸汽膜厚度以及流体性能的影响，开发了一种改进的薄膜沸腾HTC模型。发现该模型预测薄膜沸腾HTC在15％误差内。

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