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首页> 外文期刊>Journal of visualization >Visualization of Turbulence Structure in Unsteady Non-Penetrative Thermal Convection Using Liquid Crystal Thermometry and Stereo Velocimetry
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Visualization of Turbulence Structure in Unsteady Non-Penetrative Thermal Convection Using Liquid Crystal Thermometry and Stereo Velocimetry

机译：非稳态非穿透热对流中湍流结构的液晶测温和立体测速可视化

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摘要

Temperature and velocity fields in unsteady non-penetrative turbulent thermal convection of a horizontal fluid layer are measured in horizontal and vertical planes simultaneously using the combined liquid-crystal thermometry and stereo particle image velocimetry (PIV) with high spatial and temporal resolution. The result shows the formation of convection pattern across the fluid layer, which originates from the spoke structure over the heated surface. The upward fluid motion is generated from the intersection of the bursting lines of the spoke structure, while the downward motion is induced by the low temperature fluid directing toward the center of the spoke structure. Thus, the large-scale convective motion is produced in the fluid layer through the motion of spoke structure. The POD analysis of the temperature and velocity eigenfunctions shows the existence of large-scale motion in the fluid layer, which supports the observed convection pattern near the heated boundary and in the middle of the fluid layer.
机译：使用具有高空间和时间分辨率的组合液晶测温和立体粒子图像测速技术（PIV）同时在水平和垂直平面上测量水平流体层的非稳态非穿透湍流热对流中的温度和速度场。结果表明，在流体层上形成了对流模式，这是由加热表面上的辐条结构引起的。向上的流体运动是从辐条结构的破裂线的交点产生的，而向下的运动是由指向辐条结构的中心的低温流体引起的。因此，通过辐条结构的运动在流体层中产生了大规模的对流运动。温度和速度本征函数的POD分析表明，在流体层中存在大规模运动，这支持了在加热边界附近和流体层中部观察到的对流模式。

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