Boiling dynamics in parallel minichannel system with different inlet solutions

摘要

In the paper inlet pressure fluctuations in non-stationary boiling in two parallel minichannels with an inner diameter of 1 mm were considered. The open-loop system with two cases of inlet solutions (com-mon and separate) has been analysed. We conducted an analysis of the similarity of boiling dynamics in neighbouring minichannels. A new approach to multiscale recurrence quantification analysis of pressure fluctuations was proposed. This method of analysis allowed us to detect different types of boiling dynamics during liquid flow, bub-ble flow, slug flow and wavy annular flow. It has been shown that the type of channels inlet solution af-fects the character of pressure fluctuations occurring in the system. The conducted analyses have shown that the common inlet solution of minichannels leads to simultaneous flow patterns changes. The sep-arate inlet solution leads to two types of flow patterns changes in minichannels - simultaneous and alternate (shifted in time).