Heat transfer enhancement of the film flow falling along vertical fluted plates

Heat transfer enhancement of the film flow falling along vertical rectangular fluted plates is investigated in this study. We have calculated the temporal evolution of the film flow by using the CLSVOF and GF methods, and obtained the steady state film and velocity distributions. It is found that the film flow goes inside the fluted part due to the effect of the surface tension for the fluted plate and the thickness near the fluted edge is thinner. This may lead to the heat transfer enhancement. Therefore, the temperature distribution is calculated in the thermally inlet region, which corresponds to the problem of two-phase version of the well-known Graetz-Nusselt's problem. Finally, we show the relation among the heat transfer, fluted geometries and the surface tension effect.