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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermographic particle velocimetry (TPV) for simultaneous interfacial temperature and velocity measurements
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Thermographic particle velocimetry (TPV) for simultaneous interfacial temperature and velocity measurements

机译：热像仪测速仪（TPV）用于同时进行界面温度和速度测量

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摘要

We present an experimental technique, that we refer to as 'thermographic particle velocimetry' (TPV), which is capable of the simultaneous measurement of two-dimensional (2-D) surface temperature and velocity at the interface of multiphase flows. The development of the technique has been motivated by the need to study gravity-driven liquid-film flows over inclined heated substrates, however, the same measurement principle can be applied for the recovery of 2-D temperature- and velocity-field information at the interface of any flow with a sufficient density gradient between two fluid phases. The proposed technique relies on a single infrared (IR) imager and is based on the employment of highly reflective (here, silver-coated) particles which, when suspended near or at the interface, can be distinguished from the surrounding fluid domain due to their different emissivity. Image processing steps used to recover the temperature and velocity distributions include the decomposition of each original raw IR image into separate thermal and particle images, the application of perspective distortion corrections and spatial calibration, and finally the implementation of standard particle velocimetry algorithms. This procedure is demonstrated by application of the technique to a heated and stirred flow in an open container. In addition, two validation experiments are presented, one dedicated to the measurement of interfacial temperature and one to the measurement of interfacial velocity. The deviations between the results generated from TPV and those from accompanying conventional techniques do not exceed the errors associated with the latter.
机译：我们提出了一种实验技术，称为“热成像颗粒测速”（TPV），它能够同时测量二维（2-D）表面温度和多相流界面处的速度。该技术的发展是出于研究倾斜加热的基板上重力驱动的液膜流动的需要而推动的，但是，相同的测量原理也可以用于恢复二维温度和速度场信息。两个流体相之间具有足够密度梯度的任何流的界面。所提出的技术依赖于单个红外（IR）成像仪，并且基于使用高反射率（此处为镀银）粒子的情况，当这些粒子悬浮在界面附近或界面时，由于它们的存在，可以与周围的流体域区分开不同的发射率。用于恢复温度和速度分布的图像处理步骤包括将每个原始原始IR图像分解为单独的热图像和粒子图像，应用透视畸变校正和空间校准，最后执行标准粒子测速算法。通过将该技术应用于敞口容器中的加热和搅拌流，可以证明该过程。另外，提出了两个验证实验，一个验证实验专用于界面温度的测量，另一个验证于界面速度的测量。由TPV产生的结果与伴随的常规技术产生的结果之间的偏差不超过与后者相关的误差。

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