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首页> 外文期刊>International Journal of Heat and Mass Transfer >Three-dimensional liquid-vapor interface reconstruction from high-speed stereo images during pool boiling
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Three-dimensional liquid-vapor interface reconstruction from high-speed stereo images during pool boiling

机译：池沸腾过程中基于高速立体图像的三维液-气界面重建

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摘要

A technique for reconstruction of liquid-gas interfaces based on high-speed stereo-imaging is applied to the liquid-vapor interfaces formed above a heated surface during pool boiling. Template matching is used for determining the correspondence of local features of the liquid-vapor interfaces between the two camera views. A sampling grid is overlaid on the reference image, and windows centered at each sampled pixel are compared with windows centered along the epipolar line in the target image to obtain a correlation signal. The three-dimensional coordinates of each matched pixel are determined via triangulation, which yields the physical world representation of the liquid-vapor interface.Liquid-vapor interface reconstruction is demonstrated during pool boiling for a range of heat fluxes. Textured mushroom-like vapor bubbles that are fed by multiple nucleation sites are formed close to the heated surface. Analysis of the temporal attributes of the interface distinguishes the transition with increasing heat flux from a mode in which vapor is released from the surface as a continuous plume to one dominated by the occurrence of intermittent vapor bursts. A characteristic morphology of the vapor mushroom formed during vapor burst events is identified.This liquid-vapor interface reconstruction technique is a time-resolved, flexible and non-invasive alternative to existing methods for phase-distribution mapping, and can be combined with other optical based diagnostic tools, such as tomographic particle image velocimetry. Vapor flow morphology characterization during pool boiling at high heat fluxes can be used to inform vapor removal strategies that delay the occurrence of critical heat flux during pool boiling. (C) 2019 Elsevier Ltd. All rights reserved.
机译：将基于高速立体成像的液-气界面重构技术应用于在池沸腾过程中在加热表面上方形成的液-气界面。模板匹配用于确定两个相机视图之间的液体-蒸汽界面的局部特征的对应关系。将采样网格覆盖在参考图像上，并将以每个采样像素为中心的窗口与沿目标图像中的对极线为中心的窗口进行比较，以获得相关信号。通过三角剖分确定每个匹配像素的三维坐标，从而产生液-气界面的物理世界表示形式。在池沸腾过程中，针对一定热通量，展示了液-气界面的重构。在靠近加热表面的位置形成了由多个成核点送入的带纹理的蘑菇状蒸气气泡。界面时间属性的分析将热通量增加的转变与从蒸汽以连续羽流形式从表面释放到以间歇性蒸汽爆发为主的一种模式区别开来。可以识别出在蒸气爆发事件期间形成的蒸气蘑菇的特征形态。这种液-气界面重建技术是一种时间分辨，灵活且无创的方法，可以替代现有的相位分布映射方法，并且可以与其他光学相结合基于诊断的工具，例如断层扫描颗粒图像测速仪。高热通量池沸腾过程中的蒸汽流形态学表征可用于告知蒸气去除策略，这些策略可延迟池热沸腾过程中临界热通量的出现。 （C）2019 Elsevier Ltd.保留所有权利。

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