Spray Cooling Heat Flux Performance Using POCO HTC Foam

Previous studies have shown that spray cooling heat flux enhancement may be attained using enhanced surfaces. Most enhanced surface spray cooling studies have been performed using either extended or embedded surface structures. The present study investigates the effect of POCO HTC foam on spray cooling heat flux. The copper blocks used in the heat flux performance study had a cross-sectional area of 2.0 cm(2). The POCO HTC foam pieces were attached to the copper blocks using two different bonding techniques. These were S-Bond (R) soldering and high thermal conductivity epoxy as the thermal interface material. Measurements were also obtained on a heater block with a flat surface for purposes of baseline comparison. A 2 x 2 nozzle array was used with PF-5060 as the working fluid. Thermal performance data was obtained under nominally degassed conditions (chamber pressure of 41.4 kPa). Results show that the highest heat flux attained was 133 W/cm(2) using the graphite POCO HTC foam with a nozzle-to-foam distance of 17 mm.