Investigation of Refractive Bubble Distortions in PIV of Liquid Phase Turbulence in Gas-Liquid Two-Phase Flow With Large Bubbles
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Date
2012-06
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The Ohio State University
Abstract
Particle Image Velocimetry (PIV) systems have proven to be a powerful tool for measuring flows under many different conditions. As the technique is based on being able to visualize a flow, there are many inherent issues with its application to complex visualization windows. The refractive effects of light traveling through boundaries between different materials can distort images and produce inaccuracies in PIV measurements. A mathematical analysis of the refractive distortion effects has been done and is outlined in the following document. In this analysis the effects of the setup geometry and bubble inclusions has been analyzed to help with error estimation. First, the effect of the angle and location of light release as well as flow pipe thickness were investigated to see how they affect the image produced. Second the effect of bubbles being situated between the visualization plane and the camera was investigated. Finally, the different components were used to take virtual images of a theoretical bubbly flow and compare them to the base images in order to determine error functions for the bubbles. As an unexpected result, the error was found to be contained within the distorting bubble, providing no unknown error. Because of this, future investigations on reflective effect are suggested to get a better understanding of the distortion of the PIV images.
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Keywords
distortion, Particle Image Velocimetry, Turbulence, Two phase flow, Vertical pipe