Study of enhanced boiling heat transfer by micro-structure surfaces with hydrophilic-hydrophobic combined

Abstract

The VOF model was employed to simulate the pool boiling under typical engineoperating temperature conditions and was experimentally validated. A trapezoidal raised surface morphology with a hydrophilic-hydrophobic combination was designed, and the heat transfer ability and bubble evolution phenomena on the surface were analyzed. Then the variance contribution of each structural parameter of the trapezoidal raised surface to the average surface temperature rise and the average surface heat transfer was evaluated. Finally, the NSGA-II algorithm was used to optimize the structural design of the designed trapezoidal raised surface with the optimization objectives of minimizing the average temperature rise and maximizing the average heat transfer coefficient. Specifically, compared with the hydrophilic smooth surface, the optimized structure showed an increase in the average heat transfer coefficient by 194.5% and a decrease in the maximum average temperature rise, ?T, by 33.9%.