Numerical investigation of single bubble flow boiling both on a flat surface and on a cavity in horizontal pipe and pool boiling on a flat surface

In this study, Volume of Fluid (VOF) method in OpenFoam software was used to numerically simulate superheated FC-72 single bubble nucleation during flow boiling both from an artificial cavity and flat surface and single bubble nucleation during pool boiling from a flat surface. All simulations were performed in 3D. FC-72 was used as a working fluid and BaF2 was used for channel and cavity walls. The studies of the pool boiling on the flat surface were carried out on 0.01g 0.1g, 1g, 10g gravity magnitudes. Bubble detachment diameter, bubble detachment time, velocity and temperature magnitudes in bubbles were investigated on different earth gravities . The studies of flow boiling from a flat surface in horizontal channel were conducted for several bulk fluid velocities on constant Earth gravity. In this study bubble detachment diameter, bubble detachment time, velocity and temperature magnitudes in bubbles were examined and also were compared to each other. First and Second studies were compared on superheated bulk fluid (5K) and superheated solid domain (10K). The results of study which was conducted in pool boiling section on constant Earth gravity were taken and compared with results of flow boiling from a flat surface. The studies of flow boiling from an artificial cavity in horizontal channel were conducted for four different cavity depths on 1g gravity magnitude. Flow boiling from an artificial cavity studies were examined in bulk fluid at saturation temperature and superheated bulk fluid temperature seperately. Cavities diameters were defined as 30 micrometers for 3, 12, 25 and 50 micrometers cavities depths. Each cavity depth simulation was investigated at both bulk fluid temperature. Bulk fluid velocity magnitude was constant and defined as 10m/s in each study.