20.500.12556/RUL-175852 Pool boiling enhancement with submerged liquid jet impingement on a laser-engineered microchannel surface Effective thermal management of high-power electronics requires cooling solutions capable of dissipating high heat fluxes while maintaining low surface temperatures. This study investigates the pool boiling performance of two surfaces: a reference surface and a laser-textured microchannel surface, both tested with and without submerged liquid jet impingement. Experiments were conducted using saturated, twice-distilled water at atmospheric pressure, with three different mass fluxes delivered by a jet impingement device. Results show that incorporating microtubes into the microchannels to deliver direct jet impingement reduces surface superheat, particularly at higher heat fluxes. The positioning of the jet impingement device plays a key role in critical heat flux (CHF) performance. Devices embedded within the microchannels at the bottom surface yield a higher CHF enhancement with increasing mass flux compared to those positioned just above the surface. For the reference surface, CHF increases significantly with higher mass flux, while the laser-textured surface shows relatively constant CHF values. At mass fluxes of 0.64 and 3.22 kg·m$^{−2}$·s$^{−1}$, both surfaces exhibit similar CHF, but at the highest mass flux, the reference surface outperforms the laser-textured one by 20 %. The highest recorded CHF of 9098 kW·m$^{−2}$ was achieved on the reference surface. The reduced performance of the laser-textured surface is attributed to the formation of an oxidation layer, which acts as a thermal barrier, lowering heat transfer efficiency and contributing to localized dry-out. This ultimately decreases both the CHF and the heat transfer coefficient. pool boiling critical heat flux jet impingement mass flux surface engineering heat transfer enhancement vrenje v bazenu kritična gostota toplotnega toka hlajenje s curkom gostota masnega toka površinsko inženirstvo izboljšanje prenosa toplote true false true Angleški jezik Slovenski jezik Članek v reviji 2025-11-11 09:34:52 2025-11-11 09:34:58 2026-07-02 16:02:11 0000-00-00 00:00:00 2025 0 0 11 str. Vol. 68, art. 104318 Dec. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 536.2:542.467 2451-9049 10.1016/j.tsep.2025.104318 256659715 Zalec_..._Pool_boiling....pdf Zalec_..._Pool_boiling....pdf 1 914B00EC693D724FA0BD29E99880F466 3ecaf7595b3167629fd80155011468f7a3d9566ee63e6152b3ff330f88c7f6ae 7557de98-bed9-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=221759 https://www.sciencedirect.com/science/article/pii/S2451904925011096 1 fa61eaa4-bed8-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=221756 Fakulteta za strojništvo 0 0 0