Abstract
The aim of this work is to develop a method for diagnosing heat-transfer transition modes from convection to nucleate boiling and from nucleate to film boiling based on the analysis of heater surface temperature fluctuations using a discrete wavelet transform that has a number of advantages compared to the Fourier transform, which is traditionally used to obtain amplitude-frequency characteristics of temperature fluctuations and diagnosing a change in the heat-transfer mode. The developed method was tested on experimental data on heat-transfer for the convective regime and nucleate and film pool boiling of water and liquid nitrogen pool boiling at atmospheric pressure. It is shown that, at the convective heat-transfer mode, the energy of the coefficients of the wavelet decomposition of the temperature fluctuations of the heater surface is mainly localized in the region of relatively low frequencies. When the nucleate boiling mode is reached, the energy distribution of the coefficients over the decomposition levels becomes more uniform and the appearance of high frequencies is noted. The forms of energy distributions of the decomposition coefficients of temperature fluctuations for the convective heat-transfer regime and film boiling are similar, but the total energy of decomposition coefficients for film boiling is an order of magnitude larger. According to the obtained results, new criteria for changing the heat-transfer regime are formulated that are based on determining the total energy of the coefficients of decomposition of temperature fluctuations and the Shannon entropy of the distribution of the energy of the coefficients over decomposition levels. The results of the work can be useful in creating a reliable automated system for diagnosing heat-transfer, including in real time.
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Litvintsova, Y.E., Kuzmenkov, D.M., Muradyan, K.Y. et al. Diagnostics of Transient Heat-Transfer Regimes during Pool Boiling Based on Wavelet Transform of Temperature Fluctuations. Therm. Eng. 70, 875–884 (2023). https://doi.org/10.1134/S0040601523110101
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DOI: https://doi.org/10.1134/S0040601523110101