Non-linear dynamical analyses of transient surface temperature fluctuations during subcooled pool boiling on a horizontal disk
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abstract
The class of dynamics in pool boiling on a large-size heater is assessed under subcooled pool boiling conditions. Transient surface temperature measurements are obtained using surface micro-machined K-type thin film thermocouples (TFT) in 10 C subcooled pool boiling experiments on a 62.23 mm diameter silicon wafer using PF-5060 as the test liquid. Surface temperature data is obtained at each steady state condition to generate the boiling curve. The fraction of false-nearest neighbors, recurrence plots and space-time separation plots are obtained using the TISEAN package. The correlation dimension is then estimated from the re-constructed phase space data using a nave algorithm. The correlation dimension varies from 11.2 to 11.5 near onset of nucleate boiling (ONB), to 7-10 in fully developed nucleate boiling (FDNB) 7-9 near critical heat flux (CHF) condition, and from 6.6 to 7.7 in film boiling. False-nearest neighbor estimates and recurrence plots show that nucleate boiling may be dominated by statistical processes near ONB and in partial nucleate boiling (PNB). In contrast, FDNB, CHF and film boiling seem chaotic and governed by deterministic processes. 2009 Elsevier Ltd. All rights reserved.
