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Modelling and analysis of stochastic and deterministic behaviors of nucleate boiling

Mosdorf R., Zapolnik L.

Archives of Thermodynamics

2007

Vol. 28, no. 1

33-50

In the paper two kinds of numerical models of boiling have been investigated (stochastic and deterministic). The nucleate boiling on the horizontal heating surface with randomly located 100 nucleation sites has been considered. The heat fluxes absorbed from heating surface have been calculated for microlayer evaporation, natural convection and transient heat transfer. The impact of stochastic processes of activation and deactivation of nucleation sites on the dynamic properties of heating surface temperature fluctuation has been evaluated. Non-linear methods of data analysis have been applied to analysis of the heating surface temperature changes. In case of single nucleation site a significant difference between character of temperature changes at nucleation site obtained from both models under consideration has been noticed. But in case of 100 nucleation sites randomly located on the heating surface the temperature fluctuations obtained from both models are similar. Results of simulation and analyses of temperature fluctuation show that interaction of deterministic nucleation sites leads to such heating surface temperature fluctuation which is difficult to distinguish from temperature fluctuation generated by the stochastic model. Non-linear methods of data analysis such as largest Lyapunoy exponent and correlation dimension can not recognize the existence of behavior of random activation and deactivation of nucleation sites.