The effect of surface types on bubble dynamic formation during nucleate pool boiling by use of Lee and Tanasawa phase change models

Numerical simulation of boiling has always been a challenging problem in terms of the variety and effectiveness of two-phase models. Boiling is one of the efficient methods in high heat transfer. In boiling simulation, in addition to choosing an appropriate heat and mass transfer model, it will be important to evaluate the surfaces which boiling occurs on it. A problem of nucleate boiling of saturated liquid is numerically simulated in this investigation by use of VOF (volume of fluid) model together with the geo-reconstruction of the interface. One-dimensional Stephan problem as sucking interface problem is solved for verification the numerical solver. Two-phase change models of the Lee model and the Tanasawa model are used in order to calculate the rate of phase change and source terms. The results of nuclear boiling are investigated on the hydrophilic surface, hydrophobic surface, and the surface with contact angle 90 degrees. The results show that boiling on hydrophobic surfaces causes the detachment of larger bubbles with a larger heat transfer rate. Besides, bubble merging depending on the density of nucleation sites leads the nuclear boiling on hydrophobic surface to film boiling.