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Simple distinction of similar-looking inertial particles and fluid tracers on camera images
Experiments in Fluids ( IF 2.4 ) Pub Date : 2021-04-30 , DOI: 10.1007/s00348-021-03195-7
David De Souza , Till Zürner , Romain Monchaux

Abstract

Dispersed two phase flows cover a wide range of natural phenomenon and technological applications. When studying such complex systems, having access to the velocities of both phases is necessary to fully understand their dynamics. In experiments, inertial particles have to be distinguished from tracers which image the movement of the carrier fluid. For this, most studies rely on differences in size or brightness. This article presents a method for separating particles and tracers if those are of similar size and brightness. It employs fluorescent tracers and a two camera acquisition system. One camera records both particles and tracers, while the second camera only records the tracers by using an optical filter for the fluorescent light. A straightforward image processing algorithm then identifies and removes the tracers from the first image. This allows for the velocities and positions of the particles to be measured in conjunction with the velocity field of the carrying phase. A series of tests are performed on the method to demonstrate its reliability. In addition to ensuring that the method functions in a satisfactory manner, these tests give guidelines on how to use the method correctly. To illustrate an application of this method, measurement results of ceramic particles settling in still water are presented.

Graphic abstract



中文翻译:

相机图像上外观相似的惯性粒子和流体示踪剂的简单区别

摘要

分散的两相流涵盖了广泛的自然现象和技术应用。在研究这样的复杂系统时,必须充分利用两个阶段的速度才能充分了解它们的动力学。在实验中,必须将惯性粒子与示踪剂区分开,示踪剂对载流体的运动进行成像。为此,大多数研究都依赖于大小或亮度的差异。如果颗粒和示踪剂的大小和亮度相似,本文将介绍一种分离方法。它采用荧光示踪剂和两个摄像头采集系统。一台摄像机同时记录粒子和示踪剂,而第二台摄像机仅通过使用滤光器来记录荧光剂来记录示踪剂。然后,一种简单的图像处理算法可以从第一张图像中识别并删除示踪剂。这允许结合载体相的速度场来测量颗粒的速度和位置。对方法进行了一系列测试以证明其可靠性。除了确保该方法以令人满意的方式运行之外,这些测试还提供了有关如何正确使用该方法的指南。为了说明该方法的应用,给出了沉降在静止水中的陶瓷颗粒的测量结果。

图形摘要

更新日期:2021-05-03
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