Abstract
An experimental investigation of the statistical character of boiling flows has been carried out. Two flow field variables, viz. static pressure fluctuations at the test section outer wall and instantaneous chordal-average vapor fraction, were studied in vertical up-flow through concentric annular test sections. Matched piezo-electric pressure transducers were used for the pressure fluctuation measurements, and a linearized dual-beam X-ray system was used for the vapor fraction measurements. Steady state (mean) thermal-hydraulic conditions in the test section were determined by an analytical model and verified to a certain extent by capacitance probe vapor volume fraction measurements. A wide range of local conditions with flow regimes ranging from subcooled bubbly to saturated churn turbulent-slug-annular were investigated. The wall static pressure fluctuation results include: (i) intensity (RMS value). (ii) probability density function: and (iii) autopower spectral density function. The chordal-average vapor fraction results include: (i) probability density function: and (ii) autopower spectral density function. The magnitude of coherence between wall static pressure fluctuations and chordal-average vapor fraction fluctuations are presented as well. It is suggested that diagnosis of flow regimes on the basis of the statistical properties of the two variables studied should be possible.
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