Abstract
Geysering may be induced during start-up in natural circulation boiling water reactors. It is necessary for simulation of this flow instability to model the coalescence mechanism and condensation process of slug bubbles. In this work, image data processing technique using a CCD digital camera has been developed to measure slug flow characteristics. The developed measurement technique of rising velocity of slug bubbles and liquid film thickness surrounding a bubble and its measurement accuracy are discussed in this paper.
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