Progress in enhanced pool boiling heat transfer on macro- and micro-structured surfaces

As an effective way to strengthen pool boiling, surface modification has been widely studied by many scholars. In this paper, the enhancement of pool boiling heat transfer by regular surface structure modifi-cation was reviewed, including macro and micro scales. The systematic summary results showed that the pool boiling heat transfer performance of the structured surface with two scales are improved in different degrees compared with that of the ordinary smooth surface. The existence of macro-structure can elim-inate the boiling lag caused by refrigerant to a certain extent, while the micro-structure (microcolumns, microgrooves and micropores) can improve the vaporization core density, bubble departure diameter and critical heat flux to varying degrees. Under the condition of low heat flux, the trend of bubble departure diameter on different structural surfaces is different, so as the bubble departure frequency. Further re-search is needed to determine the dynamic parameters of bubbles on structural surfaces. In addition, the semi-empirical formula of heat flux and boiling heat transfer curve in literature were summarized.(c) 2022 Elsevier Ltd. All rights reserved.

Automated summary

This paper reviews the enhancement of pool boiling heat transfer through regular surface structure modification. The results show that structured surfaces with different scales can improve the pool boiling heat transfer performance compared to smooth surfaces.