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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >A novel PIV technique for measurements in multiphase flows and its application to two-phase bubbly flows
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A novel PIV technique for measurements in multiphase flows and its application to two-phase bubbly flows

机译：一种新颖的PIV多相流测量技术及其在两相气泡流中的应用

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A new experimental procedure for performing simultaneous, phase-separated velocity measurements in two-phase flows is introduced. Basically, the novel particle image velocimetry (PIV) technique is a combination of the three most often used PIV techniques in multiphase flows: PIV with fluorescent tracer particles, shadowgraphy, and the digital phase separation with a masking technique. The combination of these three independent measurement techniques is achieved by shifting the background intensity of a PIV recording to a higher, but uniform gray value level. In order to combine the advantages of these multiphase-PIV methods, a new PIV set-up was developed. With this set-up the velocity distributions of the two phases are measured simultaneously with only one b/w camera. This experimental set-up is aimed at providing a means for characterizing the modification of turbulence in the liquid phase by bubbles. This phenomenon is often called "pseudo-turbulence". [References: 24]
机译：介绍了用于在两相流中同时进行相分离的速度测量的新实验程序。基本上，新型粒子图像测速（PIV）技术是多相流中三种最常用的PIV技术的组合：具有荧光示踪剂粒子的PIV，阴影成像和具有掩膜技术的数字相分离。这三种独立测量技术的组合是通过将PIV记录的背景强度移动到较高但均匀的灰度值级别来实现的。为了结合这些多相PIV方法的优点，开发了一种新的PIV设置。通过这种设置，仅使用一台黑白摄像机即可同时测量两相的速度分布。该实验装置旨在提供一种手段，用于表征气泡对液相湍流的影响。这种现象通常被称为“伪湍流”。 [参考：24]

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