Measurement of forced convection subcooled boiling flow through a vertical annular channel with high-speed video cameras and image reconstruction
Measurement of forced convection subcooled boiling flow through a vertical annular channel with high-speed video cameras and image reconstruction
复制标题
利用高速摄像机测量垂直环形通道强制对流过冷沸腾流及图像重建
DOI：
10.1080/00223131.2021.1954561
复制
发表时间：
2021
影响因子：
1.2
通讯作者：
Shirakawa Kenetsu
中科院分区：
文献类型：
--
作者：
Ui Atsushi;Furuya Masahiro;Arai Takahiro;Shirakawa Kenetsu
为了建立有关过冷沸腾流动及其传热的模型，我们进行了过冷沸腾实验来研究过冷气泡的形成，并使用具有垂直环空流道的测试回路在大气条件下测量了气泡的发展过程。使用两台高速摄像机在时间和空间上获得高分辨率的过冷沸腾两相流参数，例如瞬时气泡速度、湍流速度分量、空隙率、核态沸腾开始（ONB）和显着空隙开始（OSV）。从高速摄像机拍摄的两个视频图像中识别出相同的气泡，并以三维方式重建轨迹。与气泡传输相关的瞬时气泡速度和湍流速度分量通过轨迹数据进行量化。观察到气泡沿着在圆周方向上大幅移动的加热棒的表面上升，并且从结果发现，与径向相比，圆周方向的速度分量足够大。
In order to develop models regarding subcooled boiling flow and its heat transfer, we conducted subcooled boiling experiments to investigate subcooled bubble formation and measured development process of the bubbles using a test loop with a vertical annulus flow path under atmospheric conditions. Two-phase flow parameters regarding subcooled boiling, such as instantaneous bubble velocity, turbulent velocity components, void fraction, onset of nucleate boiling (ONB) and onset of significant void (OSV), were obtained with two high-speed video cameras in high resolution in temporally and spatially. The identical bubbles were identified from the two video images taken by the high-speed video cameras, and the trajectories were reconstructed in three-dimensional. The instantaneous bubble velocities and turbulence velocity components regarding bubble transport were quantified with the trajectory data. It was observed that the bubbles were rising along the surface of the heater rod moved largely in the circumferential direction, and it was found from the result that velocity component for circumferential direction was enough large compared with that for radial direction.
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