Low mass flux upward vertical forced flow boiling of HFE7000

Forced convective boiling experiments with HFE7000 as the working fluid were conducted for upward flow in a vertical tube at 122 kPa (1.2 bar), inlet subcooling of 2 K and mass flux ranging between 50 and 150 kg/m2 s. The experimental facility consisted of a smooth 8 mm inside diameter optically transparent sapphire tube with overall length of 120 mm. A central 80 mm long section was coated with optically transparent and electrically conductive …