20.500.12556/RUL-173788 Additively manufactured copper surfaces with porous microfeatures for enhanced pool boiling performance This study evaluates pool boiling on additively manufactured copper surfaces with various microstructures, using distilled water under saturated atmospheric conditions. Initially, heat-treated and untreated samples were compared to assess thermal conductivity effects. Heat-treated samples, despite higher thermal conductivity, generally showed lower heat transfer coefficients (HTC) due to smoother surfaces and fewer active nucleation sites. Further testing involved heat-treated surfaces with channels, tunnels, chimneys, and pillars of varying heights, benchmarked against a flat surface. Chimney structures achieved the highest enhancements, surpassing 3000 kW m$^{-2}$ in maximum heat flux and an HTC of 260 kW m$^{-2}$ K$^{-1}$, which is a 400 % improvement compared to the reference. Their superior performance resulted from efficient liquid-vapor separation, capillary wicking, and favorable bubble dynamics facilitated by their geometry. Pillar structures significantly enhanced critical heat flux but had limited HTC due to vapor entrapment and bubble coalescence. In contrast, chimney features provided balanced boiling performance across diverse heat fluxes. Overall, this study demonstrates the promise of laser powder bed fusion to create advanced copper surfaces for effective thermal management applications, particularly in systems demanding high heat dissipation, minimal surface superheat, and complex geometries. nucleate pool boiling laser powder bed fusion additive manufacturing heat transfer enhancement critical heat flux complex microstructures mehurčkasto vrenje laserska fuzija prahu aditivna proizvodnja izboljšan prenos toplote kritična gostota toplotnega toka kompleksne mikrostrukture true false true Angleški jezik Slovenski jezik Članek v reviji 2025-09-23 10:53:06 2025-09-23 10:53:15 2026-07-03 04:23:20 0000-00-00 00:00:00 2026 0 0 11 str. pt. A, art. 110325 Vol. 220 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.785.6:544.537 1290-0729 10.1016/j.ijthermalsci.2025.110325 249973251 1-s2.0-S1290072925006489-main.pdf 1-s2.0-S1290072925006489-main.pdf 1 199B47E8C36BF78AA0C260C8698526D2 72505c808b9adc8de7a50772243a54786426377d39643454c6ea8477d152c6a8 2e22f3bb-7616-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=236880 https://www.sciencedirect.com/science/article/pii/S1290072925006489 1 8f687657-985a-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=218446 Fakulteta za strojništvo 0 0 0