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SAND Report: SAND91-1538, January 1992
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ABSTRACT: X-ray observations of boiling sodium in a 75-kWt reflux-pool-boiler solar receiver operating at up to 8000C were carried out. Both cinematographic and quantitative observations were made. From the cinematography, the pool free surface was observed before and during the start of boiling.
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During boiling, the free surface rose out of the field of view, and chaotic motion was observed. From the quantitative observations, void fraction in pencil-like probe volumes was inferred, using a linear array of detectors. Useful data were obtained from three of the eight probe volumes, Information from the other volumes was masked by scattered radiation. During boiling, time averaged void fractions ranged from 0.6 to 0.8. During hot restarts, void fractions near unity occurred and persisted for up to 1/2 second. Show Less