Subcooled boiling oscillations in natural circulation boiling loop at low pressure
Subcooled boiling oscillations in natural circulation boiling loop at low pressure
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DOI：
10.1002/aic.14258
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Arnab Karmakar;Nababithi Goswami;S. Paruya
中科院分区：
文献类型：
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作者：
Arnab Karmakar;Nababithi Goswami;S. Paruya
报道了低压自然循环沸腾回路中的流动不稳定性。沸腾初期的振荡主要是混沌振荡，并随入口过冷度ΔTsub和加热器功率Q的变化而分叉为准周期振荡。它们还强烈地依赖于回路中的水量Φ。我们提出了功率谱，吸引子重建，和赫斯特指数的实验数据的分析。分析表明，主振荡与间歇泉不稳定性非常相似。混沌振荡发生在低ΔTsub或高Q时，而准周期振荡发生在高ΔTsub或低Q时。我们的实验还表明，超过临界值的壁厚触发的不稳定。© 2013美国化学工程师学会AIChE J，60：375-386，2014
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 ΔTsub 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 ΔTsub or high Q, whereas quasiperiodic oscillations occur at high ΔTsub 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