Visualization and PTV Study of Natural Convection in Particle Suspensions : Simultaneous Measurements of Velocity, Temperature and Interface between Particle-Free Fluid and Suspension
Visualization and PTV Study of Natural Convection in Particle Suspensions : Simultaneous Measurements of Velocity, Temperature and Interface between Particle-Free Fluid and Suspension
复制标题
颗粒悬浮液中自然对流的可视化和 PTV 研究：同时测量速度、温度以及无颗粒流体与悬浮液之间的界面
DOI：
10.1299/jsmeb.44.30
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
N. Nishikawa
中科院分区：
文献类型：
--
作者：
F. Mikami;Bin Chen;N. Nishikawa
采用折射率匹配和激光诱导荧光（LIF）技术对悬浮液中的自然对流进行了实验研究。矩形试验段填充有颗粒悬浮液，并从水平底部加热，两个面对的垂直壁保持在恒定温度。荧光颗粒的图像由CCD照相机通过锐切滤波器捕获，该锐切滤波器将发射的荧光与散射的激发光分离。用粒子跟踪测速仪（PTV）对流场进行了定量分析。无颗粒流体和悬浮液之间的界面以及温度场与速度场同时可视化。有人建议，两层对流细胞驱动的加热和沉降的颗粒，驱动对流在上覆层由于在界面处的加热的透明流体的释放。
Natural convection in a suspension was studied experimentally using both refractive index matching and laser induced fluorescence (LIF) techniques. A rectangular test section was filled with particle suspension and was heated from a horizontal bottom, and two facing vertical walls were kept at a constant temperature. The images of the fluorescent particles were captured by a CCD camera through a sharp cut filter which separates emitted fluorescence from scattered excitation light. The flow velocity fields were analyzed quantitatively using Particle Tracking Velocimetry (PTV). Interface between particle-free fluid and suspension as well as temperature fields was visualized simultaneously with the velocity fields. It was suggested that two-layer convection cells were driven by both heating and sedimentation of particles which drives convection in the overlying layer due to the release of the heated clear fluid at the interface.