Study on boiling heat transfer of surface modification based on Lattice Boltzmann and experiments

In this paper, according to the microscopic nature and mesoscopic characteristics of lattice Boltzmann method, the boiling heat transfer of surfaces with different wettability is numerically simulated by using the pseudo-potential lattice Boltzmann method gas-liquid model. Firstly, under the local heat transfer condition, the nucleation mechanism of single bubble and the heat transfer effect of wall with different wettability are analyzed in detail through the characteristics of bubble automatic nucleation and interface automatic evolution. It not only overcomes the disadvantage that seed bubbles need to be placed in advance in the macroscopic flow model to simulate nuclear boiling, which makes it difficult to study the nucleation mechanism of bubbles, but also overcomes the disadvantage that Lennard-Jones potential in molecular dynamics cannot accurately describe the interaction between fluid molecules and solid molecules on the wall. Then, the boiling curves of non-mixed wettability surfaces are plotted by extending the scope of the study to multiple bubbles. On this basis, the bubble nucleation and heat transfer characteristics of the mixed wettability surface were studied.