Accuracy Evaluation of Image Processing Method for the Measurement of Rising Bubble Volume in Stagnant Fluid
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概要
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The measurement error when calculating the bubble volume by using image analysis was estimated by taking a single bubble of known volume (0.02 × 10<SUP>-6</SUP>-2.00 × 10<SUP>-6</SUP> m<SUP>3</SUP>, or the volume equivalent diameter of 3.37-15.63 mm) and using a stereo visualization system with a high-speed camera. Previous studies calculated the bubble volume from images observed by the one-way photography method using the short-axis rotation of the bubble shape, which was assumed to have short-axis symmetry for approximation of the bubble shape to a spheroid. This study clarified the measurement accuracy for bubble volumes using one- and two-way image analysis methods. The results showed that the one-way method tended to underestimate the bubble volume when using the long-axis rotation, which approximates the bubble depth diameter by using the short-axis diameter, and overestimate the volume when using the short-axis rotation, which approximates the bubble depth diameter by the long-axis diameter. The measurement accuracy of the calculated bubble volume degraded for large bubble volumes. A one-way volume measurement method using a correlation equation was developed, and its accuracy was equivalent to the measurement accuracy of the two-way method using stereo visualization.
- 一般社団法人 日本機械学会の論文
著者
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Watanabe Noriyuki
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Aritomi Masanori
Research Lab. For Nucl. Reactors Tokyo Institute Of Technology
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ARITOMI Masanori
Research Laboratories for Nuclear Reactors, Tokyo Institute of Technolog
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INABA Noriaki
Research Laboratories for Nuclear Reactors, Tokyo Institute of Technology
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