Synchrotron radiation microtomography of Taylor bubbles in capillary two-phase flow
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We report on a study to measure the three-dimensional shape of Taylor bubbles in capillaries using synchrotron radiation in conjunction with ultrafast radiographic imaging. Moving Taylor bubbles in 2-mm round and square capillaries were radiographically scanned with an ultrahigh frame rate of up to 36,000 fps and 5.6-µm pixel separation. Consecutive images were properly processed to yield 2D transmission radiographs of high contrast-to-noise ratio. Application of 3D tomographic image reconstruction disclosed the 3D bubble shape. The results provide a reference data base for development of sophisticated interface resolving CFD computations.
KeywordsLiquid Film Bubble Velocity Bubble Shape Search Beam Liquid Slug
The authors acknowledge the German Research Foundation (DFG) for funding the present study within the project HA3088/7–1, which is embedded within the Priority Program SPP 1506 “Transport Processes at Fluidic Interfaces”. The authors further kindly acknowledge the provision of beam time by the synchrotron radiation source ANKA, and the research was partially funded by the German Federal Ministry of Education and Research by Grants 05K10CKB (UFO: Ultra fast X-ray imaging of scientific processes with on-line assessment and data-driven process control).
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