Application of holographic interferometry and 2D PIV for HSC convective flow diagnostics
Application of holographic interferometry and 2D PIV for HSC convective flow diagnostics
复制标题
全息干涉测量和 2D PIV 在 HSC 对流诊断中的应用
DOI：
10.1088/0957-0233/15/4/008
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
S. Kim
中科院分区：
文献类型：
--
作者：
S. Lee;S. Kim
采用全息干涉测量技术和二维粒子图像测速系统，研究了不同Rayleigh数下Hele-Shaw对流单体（HSC）内温度场和速度场的变化。为了测量温度场的准稳态变化，采用了两种不同的全息干涉测量方法--双曝光法和实时法。在双曝光方法中，使用数字图像处理技术有效地消除了不需要的波。重建的图像清晰，但无法重建清晰的瞬时流动。另一方面，瞬态对流流动可以很好地使用实时方法重建。然而，实时方法重建的条纹图比双曝光方法包含更多的噪声。实验结果表明，在低瑞利数和高瑞利数的时间依赖的周期性流动结构的稳定的流动模式。用实时全息干涉法得到的高瑞利数下的周期性流型与PIV结果吻合较好。
Variations of temperature and velocity fields in a Hele–Shaw convection cell (HSC) were investigated using a holographic interferometry and 2D PIV system with varying Rayleigh number. To measure quasi-steady variation of the temperature field, two different measurement methods of holographic interferometry—the double-exposure method and the real-time method—were employed. In the double-exposure method, unwanted waves were eliminated effectively using a digital image processing technique. The reconstructed images are clear, but transient flow cannot be reconstructed clearly. On the other hand, transient convective flow can be reconstructed well using the real-time method. However, the fringe patterns reconstructed by the real-time method contain more noise than the double-exposure method. Experimental results show a steady flow pattern at low Rayleigh numbers and a time-dependent periodic flow structure at high Rayleigh numbers. The periodic flow pattern at high Rayleigh numbers obtained by the real-time holographic interferometer method is in good agreement with the PIV results.