THREE-DIMENSIONAL SIMULATION OF BUBBLE GROWTH ON HORIZONTAL MICROSTRUCTURED SURFACES

초록

With an increasing demand for higher cooling capacity, surface modification by micro machined or MEMS fabricated structures has been used as an effective way to enhance nucleate boiling. In this paper, three-dimensional numerical simulations of the bubble motion and boiling heat transfer on a surface with microstructures such as fins are performed to further clarify the boiling process and to find the better conditions for boiling enhancement. The phase interfaces are determined by a sharp-interface level-set method which is modified to include the effect of phase change at the liquid-vapor interface and to treat the no-slip and contact-angle conditions on immersed solid surface of microstructures. The computational results show that finned surface augments boiling heat transfer compared to a plain surface. The effect of fin height on bubble growth and heat transfer are investigated.

키워드