20.500.12556/RUL-181982 Boiling flow visualization experiment scaled to divertor cooling conditions A dedicated experiment FEDORA (Fusion Experiment for Divertor Optimization Research Applications) has been constructed to visualize flow boiling at scaled fusion divertor conditions. Its main purpose is to obtain the information on local boiling parameters, needed for the development of mechanistic boiling models in Computational Fluid Dynamics (CFD) codes. Current boiling models, although grounded on realistic physical principles, still rely heavily on empirical correlations, particularly for boiling parameters such as nucleation site density, bubble departure diameter, and bubble departure frequency. Due to the harsh operating conditions in the water-cooled divertor plasma-facing components (high heat fluxes over 10 MW/m$^2$, mean flow velocity of about 9 m/s), visualization of boiling in realistic cooling channels is not feasible. The proposed experiment addresses this challenge by employing a surrogate coolant, characterized by lower latent heat and saturation temperature. By analyzing key dimensionless numbers, the aim is to replicate boiling conditions to be similar to those in coolant channels of upcoming divertor designs. Distinctive features of the proposed experimental setup include visually transparent boiling channel, infra-red transparent window and a thin electrically heated foil. This setup allows simultaneous high-speed and high-resolution recording of boiling phenomena in the flow and measurement of temperature distribution on the heated surface. In this work, the design, similarity analysis and the first measurement results are presented, proving the concept of the visualization approach to understand the boiling heat transfer in divertor cooling channels. flow boiling high-heat flux divertor cooling conditions visualization experiment boiling parameters jedrska tehnika vrenje pretok true false true Angleški jezik Slovenski jezik Članek v reviji 2026-04-21 14:39:49 2026-04-21 14:39:57 2026-04-22 04:28:34 0000-00-00 00:00:00 2025 0 0 6 str. art. 115188 Vol. 218 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.039 0920-3796 10.1016/j.fusengdes.2025.115188 238773251 1-s2.0-S0920379625003850-main.pdf 1-s2.0-S0920379625003850-main.pdf 1 B56CF0689D43F9CF9DB623AC15CF9BC1 be3e49c57a6bfb5061dae6b056406c134639f1fe5ca4b61a5a91feb61211160b 2ed82246-3d7f-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=232832 https://www.sciencedirect.com/science/article/pii/S0920379625003850 0 278fb1ed-3d7f-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=232831 Fakulteta za matematiko in fiziko 0 0 0