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.

在当前的研究中，基于小型淬火测试设备，使用图像处理框架对淬火瞬变期间的两相流界面行为进行了可视化和分析。在当前框架中获得的两相流的高保真实验结果可以支持时域和频域的各种研究。特别是，在不同测试条件下从不同加热表面获得的数据的可视化用于执行全尺寸瞬态二维蒸汽膜重建。通过处理后的数据可以直接获得各种传热方式以及初始膜破裂点的液-气界面变化。此外，详细研究了接近淬灭的界面波频率的时间变化。根据获得的液-气界面高分辨率数据，通过理论分析获得详细的相速度和温度分布，在此基础上可以确定薄膜沸腾传热系数（HTC）。此外，考虑了壁面过热度、液体过冷温度、蒸汽膜厚度以及流体特性的影响，开发了改进的薄膜沸腾 HTC 模型。发现该模型可以在 15% 的误差内很好地预测薄膜沸腾 HTC。液体过冷温度、蒸气膜厚度以及流体特性。发现该模型可以在 15% 的误差内很好地预测薄膜沸腾 HTC。液体过冷温度、蒸气膜厚度以及流体特性。发现该模型可以在 15% 的误差内很好地预测薄膜沸腾 HTC。