Experimental Visualizations of the Blowdown Transients of Subcooled and Supercritical Carbon Dioxide
Date
2021-02-28
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Abstract
The rapid decompression of sub-cooled and supercritical carbon dioxide was investigated experimentally using schlieren and regular high-speed photography. An optically accessible expansion tube was designed and constructed. A test campaign with initial pressures ranging from 6.45-9.02 MPaA and initial temperatures from 297-308 K was performed. High-speed schlieren imagery was used to visualize the rarefaction waves, evaporation waves, and shocks present in the blowdown process. The time history of pressures at different locations in the experiment was recorded using fast response pressure transducers. Image and pressure signal analyses were performed to extract decompression wave speeds, evaporation wave speeds, and decompression rates. Results were compared to analytical models and other experiments reported in the literature. The sensitivity of pressure undershoot and wave speed to initial conditions was analyzed. A theory explaining the presence of an oscillatory phase change region associated with a shock train is presented.
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Carbon Dioxide
Citation
Quinn, D. (2021). Experimental Visualizations of the Blowdown Transients of Subcooled and Supercritical Carbon Dioxide (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.