Effect of rectangular micro cavity on pool boiling heat transfer on heating surface via the lattice boltzmann method

In this work, we explore the effect of different rectangular micro cavity geometric parameters on heat transfer capacity of pool boiling. In this work, FORTRAN language was used for programming, establishes a pool boiling model of two-dimensional rectangular micro cavity heating surface based on pseudo-potential hybrid thermal lattice Boltzmann method, and carries out computational fluid dynamics simulation. Rectangular micro pits are uniformly distributed on the heating surface to form the texture. The coupling effects of three different microstructure parameters such as width (30 l.u., 50 l.u., 70 l.u.), height (30 l.u., 50 l.u., 70 l.u.) and spacing (30 l.u., 50 l.u., 70 l.u.) on pool boiling heat transfer performance were studied. The bubble behavior and boiling heat transfer on the heating surface of micro cavity were studied. It is found that the rectangular micro cavity structure can promote the heat transfer performance of pool boiling. The uniform microstructure provides a stable vaporization core and promotes early bubble coalescence. It is confirmed that the width and spacing have a great impact on the heat flux, where smaller widths are conducive to boiling heat transfer. With increasing micro cavity spacing, the heat transfer performance first improves and then worsens. If the spacing is too wide, film boiling will occurs and the heat transfer capacity will deteriorate rapidly. However, the depth has little effect on boiling heat transfer capacity.

Automated summary

In this study, the effect of different geometric parameters of rectangular micro cavities on the heat transfer capacity of pool boiling was explored. The results showed that the rectangular micro cavity structure can enhance the heat transfer performance, while the width and spacing have a significant impact on the heat flux.