Temperature fluctuation at twin cavity in nucleate boiling - wavelet analysis and modelling

In the paper the wavelet analysis of heating surface temperature fluctuation at the artificial cavities in nucleate boiling has been carried out. It has been shown that depending on distance between cavities the process of bubbles departure from twin cavity can synchronize and create the unified conditions for heat transfer around the cavities. It has been found that synchronization of interacting cavities leads to decrease in mean frequency of bubbles departure. The new concept of promotion or inhibition of interacting cavities has been defined based on the wavelet analysis. Two-dimensional boiling field was approximated and modeled using CML method. Two mechanisms of interaction between bubble columns have been considered: the thermal and hydrodynamic ones. The simulation shows that thermal interaction between two cavities and bubble columns leads to deactivation of neighboring cavity whereas the hydrodynamic interaction sustains the activity of neighboring cavity. (c) 2006 Elsevier Ltd. All rights reserved.