The wall heat flux partitioning during the pool boiling of water on thin metallic foils

• DOI: 10.1016/j.applthermaleng.2021.117638
• Publication Date: 2021-10-05T00:58:33Z
• Authors: Matevž Zupančič; Peter Gregorčič; Mattia Bucci; Chi Wang; Gustavo Matana Ag...; Matteo Bucci
• Keywords: surface laser micro-engineering; laserska mikroobdelava površin; delitev toplotnega toka; mehurčkasto vrenje; mehurčkasto vrenje, tanke kovinske folije, laserska mikro-obdelava površin, infrardeča termografija, delitev toplotnega toka; tanke kovinske folije; infrardeča termografija; 01 natural sciences; nucleate boiling; info:eu-repo/classification/udc/536:66.02(045); info:eu-repo/classification/udc/536; thin metallic foils; heat flux partitioning; 0103 physical sciences; nucleate boiling, thin metallic foils, surface laser micro-engineering, infrared thermometry, heat flux partitioning; infrared thermometry

In this work, we studied the wall heat flux partitioning during pool boiling of water on thin metallic surfaces. We conducted experiments surfaces where engineered nucleation sites by nanosecond-fiber-laser texturing. These form triangular lattice patterns with different pitches. measured time-dependent temperature and distributions surface using an infrared camera. developed post-processing algorithms to measure, based these distributions, all fundamental parameters used in models (e.g., site density, bubble wait growth time, footprint radius) actual flux, i.e., how much is transferred evaporation microlayer, rewetting surface, convective effects. This work reveals that mechanisms transfer substrates small thermal capacity are very compared large capacity. With water, microlayer typically does not dry out at practically same as fluid temperature. effects limit efficiency transfer. Instead, generated process remove most energy from heated surface. behavior captured a model re-derived first principles describe substrate