Numerical Study of Subcooled Flow Boiling of Water-Al2O3 in Vertical Sinusoidal Wavy Channel

Subcooled flow boiling has many industrial applications such as nuclear engineering and energy generation. The study of the subcooled flow boiling provides a lot of information about the void fraction of vapor on the wall and also the critical heat flux. In this paper, the sub cooled flow boiling in a 2D vertical corrugated channel has been investigated numerically. The two-fluid model and the finite volume method have been used in this investigation. The obtained results show that with increasing of nanoparticles in the base fluid, the void fraction and bubbles departure reduced, However, the wall temperature increases due to heat flux evaporation decreases. Also, with increasing the wavy amplitude, the wall temperature and void fraction increases. that increasing the water temperature on the wall decreases its density and the fluid velocity increases in the vicinity of the wall because the momentum of the flow is constant in the transverse cross section of the channel. Furthermore, because of the variations of the velocity due to the variations of the channel's cross section, the void fraction of the vapor increases in the converging areas of the corrugated channel.