20.500.12556/RUL-132089 The wall heat flux partitioning during the pool boiling of water on thin metallic foils In this work, we studied the wall heat flux partitioning during the pool boiling of water on thin metallic surfaces. We conducted boiling experiments on surfaces where we engineered nucleation sites by nanosecond-fiber-laser texturing. These nucleation sites form triangular lattice patterns with different pitches. We measured the time-dependent temperature and heat flux distributions on the boiling surface using an infrared camera. We developed post-processing algorithms to measure, based on these distributions, all the fundamental boiling parameters used in heat flux partitioning models (e.g., nucleation site density, bubble wait and growth time, and bubble footprint radius) and the actual partitioning of the heat flux, i.e., how much heat is transferred by evaporation of the microlayer, rewetting of the surface, and convective effects. This work reveals that the mechanisms of heat transfer on substrates of small thermal capacity are very different compared to substrates of large thermal capacity. With water, the bubble microlayer typically does not dry out and the surface temperature at rewetting is practically the same as the rewetting fluid temperature. These effects limit the efficiency of microlayer evaporation and rewetting heat transfer. Instead, convective effects generated by the bubble growth process remove most of the energy from the heated surface. This behavior is captured by a heat flux partitioning model that we re-derived from first principles to describe the heat transfer mechanisms on substrate of small thermal capacity. nucleate boiling thin metallic foils surface laser micro-engineering infrared thermometry heat flux partitioning mehurčkasto vrenje tanke kovinske folije laserska mikroobdelava površin infrardeča termografija delitev toplotnega toka true false true Angleški jezik Slovenski jezik Članek v reviji 2021-10-12 10:59:33 2021-10-12 10:59:41 2025-02-06 13:19:28 0000-00-00 00:00:00 2022 0 0 16 str. Vol. 200, art. 117638 Jan. 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 536:66.02(045) 1359-4311 10.1016/j.applthermaleng.2021.117638 80131843 RAZ_Zupancic_Matevz_2022.pdf RAZ_Zupancic_Matevz_2022.pdf 1 71854AAE1C3EB759A5C931A3C426C9D4 c02d4316a1de93e9a38f53321ec0fe586d57fae5ada9f0133e46cd4c144b3015 9b23d50c-2b3c-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=149610 https://www.sciencedirect.com/science/article/pii/S1359431121010644 0 bc9bdc7c-2b3a-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=149607 Fakulteta za strojništvo 0 0 0