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Subcooled boiling oscillations in natural circulation boiling loop at low pressure
Author(s) -
Karmakar Arnab,
Goswami Nababithi,
Paruya Swapan
Publication year - 2014
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14258
Subject(s) - subcooling , natural circulation , boiling , superheating , quasiperiodic function , mechanics , attractor , instability , thermodynamics , physics , chemistry , condensed matter physics , mathematics , mathematical analysis
Flow instabilities in a natural circulation boiling loop at a low pressure are reported. The oscillations at boiling incipience are primarily chaotic and bifurcate to quasiperiodic ones depending on inlet subcooling ΔT sub and heater power Q. They also strongly depend on water volume Φ in the loop. We have presented power spectrums, attractor reconstructions, and Hurst exponents for the analysis of the experimental data. The analysis shows that the primary oscillations are very similar to geysering instability. Chaotic oscillations occur at low ΔT sub or high Q, whereas quasiperiodic oscillations occur at high ΔT sub or low Q. Our experiments also suggest that wall superheat exceeding a critical value triggers the instability. © 2013 American Institute of Chemical Engineers AIChE J , 60: 375–386, 2014