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Beijing Hangkong Hangtian Daxue Xuebao/ Journal of Beijing University of Aeronautics and Astronautics, 45(8), 1495–1503p. (2019) DOI:10.13700/j.bh.1001-5965.2018.0633
Aiming at the unstable heat transfer of mini-channel parallel tubes in boiling heat transfer process, the thermodynamic characteristics of mini-channel parallel tubes during dryout were studied. Firstly, by observing the transition of the flow pattern before and after the dryout in the parallel mini-channels, the flow pattern is divided into three areas: the annular warning zone, the initial dryout zone and the mist dryout zone. The changes of dryness and heat transfer coefficient of working medium in mini-channel parallel tubes under three flow patterns were analyzed. It was found that the boiling heat transfer coefficient decreased significantly with the development of dryout. Then, the pressure drop signals under the three flow patterns are collected and analyzed by the adaptive optimal kernel time-frequency representation (AOK-TFR), auto regression (AR) power spectrum and recurrence plots analysis method to obtain the dynamic characteristics of the corresponding flow pattern. It is found that in the initial point of dryout, the phenomenon of dryout occurs repeatedly in the channel, and the phenomenon of reflux is serious. Finally, by summarizing the characteristic parameters in the recurrence plots, the difference among the initial dryout zone, annular warning zone and the mist dryout area is obtained. Based on the distribution of the recursive eigenvalues, the different zones can be identified, and then the dryout can be predicted by the pressure drop signals. The research of this paper hopes to supplement and improve the thermodynamic characteristics in the field of mini-channel boiling heat transfer.
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