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By changing the air and water flowrelative rates in the two-phase (air-water) flow through a minichannel,we observe aggrega-tion and partitioning of air bubbles and slugs of different sizes. An air bubble arrangement,which show non-periodic and periodic patterns. Thespatiotemporal behaviour was recorded by a digital camera. Multiscale entropy analysis is a method of measuring the time series complexity. The main aim of the paper was testing the possibility of implementation of multiscale entropy for two-phase flow patterns classification. For better understanding,the dynamics of the two-phase flow patterns inside the minichannel histograms and wavelet methods werealso used. In particular, we found a clear distinction between bubbles and slugs formations in terms of multiscale entropy. On the other hand,the intermediate region was effected by appearanceofboth forms in non-periodic and periodic sequences. The preliminary results were confirmed by using histograms and wavelets.