2026-10-14T12:24:48Z https://www.scidb.cn/oai

10.57760/sciencedb.hjs.00684 2026-05-12T12:56:02Z

2026-05-12 Simulation and Experimental Comparative Analysis of Thermal Slow-Release Behavior of a Synchrotron Radiation Heat Absorber with U-Shaped Helical Cooling Channels doi:10.57760/sciencedb.hjs.00684 en Background High-heat-load absorbers in synchrotron radiation front-end systems faceare subjected to extreme thermal loads. , and Their their cooling performance directly dictatesdetermines component temperature, thermal stress, and long-term reliability. The internal cooling channels are often frequently designed as variable-curvature helical paths, , whose compact and complex geometry makes high-resolution particle image velocimetry (PIV) measurements exceptionallyextremely difficult. , which hinders flow and heat transfer validation. Purpose To This study aims to establish a validated flow prediction method for the helical cooling channels in synchrotron radiation high-heat-load absorbers, enabling reliable conjugate heat transfer analysis and future field-synergy-based heat transfer enhancement., Methods U-type quartz tubes with three different curvature radii were fabricated as experimentally accessible surrogates for the helical channels. PIV measurements were performed on these small-diameter transparent models under multiple Reynolds numbers. Corresponding computational fluid dynamics (CFD) models were developed, and turbulence model comparison together with grid independence analysis was carried out. The simulated velocity distribution, axial velocity evolution, and peak velocity were compared with PIV data. Heat dissipation experiments and fluid-structure interaction (FSI) thermal simulations were further conducted to evaluate the conjugate heat transfer prediction.this study adopts U-type tubes as experimentally accessible surrogates. Small-diameter transparent quartz models with three curvature radii were fabricated, and PIV measurements were conducted under multiple Reynolds numbers. Corresponding CFD models were developed to compare velocity distribution, axial velocity evolution, and peak velocity. Turbulence model comparison and grid independence analysis were also performed. Results show that Tthe SST k-ω model accurately captures the dominant flow features. Across 18 operating conditions, the average relative deviation of the peak velocity between CFD and PIV was approximatelyis about 3.3%. For a typical condition, the mean relative errors of the axial velocity evolution were 3.25% at the inlet and 8.96% at the outlet. Compared with the heat dissipation experiments, the FSI thermal analysis predicted the peak temperature with an error within 8.3%, and showed good agreement in overall temperature distribution and hotspot location. The convective heat transfer coefficient distribution revealed high heat transfer in high-velocity regions (inlet and outer bend) and heat transfer failure in the flow separation region (inner bend), highlighting the dominant role of the flow state in local heat transfer. ConclusionsUnder a typical condition, the mean relative errors of axial velocity evolution are 3.25% at the inlet and 8.96% at the outlet. Moreover, comparison between heat dissipation experiments and FSI thermal analysis shows a peak-temperature prediction error within 8.3%, with good agreement in overall temperature distribution and hotspot location. The distribution of convective heat transfer coefficients shows that high heat transfer occurs in high-velocity regions (inlet and outer bend), whereas heat transfer failure appears in the flow separation region (inner bend), highlighting the dominant role of flow state in heat transfer. This The PIV–CFD validation strategy based on U-type surrogate channels provides a reliable foundation for flow prediction and, conjugate heat transfer analysis,  of complex cooling channels in synchrotron radiation high-heat-load absorbers. The results confirm the governing influence of the flow state on heat transfer distribution and support future field-synergy-based heat transfer enhancement investigations. Synchrotron radiation; U-type tube; Particle Image Velocimetry (PIV); Fluid-Structure Interaction(FSI); Flow and heat transfer characteristics sun yun fei Sun Kun Xu Shuhao Xue Song Liu Junnan Wishing you all the money Luo Hongxin Jin Limin RESTRICTED dataset Science Data Bank