Research progress on flow boiling in vertical narrow rectangular channels

This paper reviews the heat transfer experimental studies on the effects of geometric and operating parameters on heat transfer in vertical narrow rectangular channels, and the studies on the nucleation and movement of bubbles and the flow regime and transformation in narrow channels. The research on the heat transfer mechanism of flow boiling in narrow rectangular channels is analysed and summarized from the aspects of heat transfer model, onset of nucleate boiling, onset of significant void, onset of flow instability and critical heat flux. Combined with the current experimental and theoretical research, the existing problems are summarized, which provides a reference for the further study of flow boiling in narrow rectangular channels.