Bubble dynamics during boiling on biphilic surfaces with cavity arrays

The boiling process on a biphilic copper surface with arrays of hydrophobic cavities approximately 100 µm in size and 780 µm in pitch was caught on video. The bubble departure diameters and frequencies were determined as functions of heat flux, and their rise velocities were determined as functions of diameter. The dependence of the bubble diameters on heat flux was compared with theoretical dependences and with data from other authors. It was shown that common dependences do not take into account parameters important for boiling on biphilic surfaces with inhomogeneities in the form of cavities and are poorly suited for describing bubble dynamics.