Investigation of dryout oscillation dependency on surface wettability in printed circuit steam generator인쇄 회로 증기 발생기에서 표면의 젖음성에 따른 드라이아웃 진동 연구

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A Printed Circuit Steam Generator (PCSG) is one of the promising steam generator types that is manufactured with diffusion bonding process, so it has advantages such as high surface-to-volume ratio, better affordability, and superior structural integrity under high pressure and temperature conditions. Nonetheless, PCSG is a once-through steam generator, thus dryout and two-phase instability occur in the flow path. Due to these phenomena, periodical alternating stress induced by dryout thermal fluctuation can finally lead to the thermal fatigue failure. To overcome the limitation of dryout in once-through steam generator channels, a mitigation strategy by controlling wettability of the channel surface is investigated in this thesis. To experimentally analyze the dryout phenomena, a test section with semi-circular bare surface channel with 4mm diameter and another test section with identical geometry but hydrophobic surface were manufactured, and experiments with two test sections were conducted. As a result, frequencies of dryout thermal fluctuation on both the bare and the hydrophobic surfaces were measured as 0.1 to 1Hz but the maximum temperature amplitude was smaller for the hydrophobic surface by 20℃. Furthermore, to assess thermal fatigue failure under real nuclear reactor operating condition, a dryout frequency prediction model and a dryout amplitude prediction model are newly suggested based on the newly obtained experimental data in this thesis and the previous studies. To analyze thermal fatigue failure under more challenging conditions than a light water reactor condition, a PCSG for PGSFR operating condition was newly designed and evaluated. From the design results of PCSG and the newly proposed dryout thermal fluctuation prediction model, the frequency was estimated to be 51Hz under the PGSFR operating condition. With the predicted variables, PCSGs under PGSFR operating condition with bare surface and hydrophobic surface are modeled with finite element method, and it was observed that the PCSG with hydrophobic surface has smaller alternating stress induced by dryout thermal fluctuation under the identical thermal-hydraulic condition.
Lee, Jeong Ikresearcher이정익researcher
한국과학기술원 :원자력및양자공학과,
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학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2023.2,[vii, 109 p. :]


Small modular reactor▼aPrinted circuit steam generator▼aOnce-through steam generator▼aDryout oscillation▼aDryout fluctuation▼aTwo-phase instability▼aThermal fatigue failure▼aWettability effect▼aHydrophobic surface▼aDryout oscillation mitigation; 소형원자로▼a인쇄기판형 증기발생기▼a관류형 증기발생기▼a드라이아웃 진동▼a이상유동 불안정성▼a열피로파괴▼a젖음성 효과▼a소수성 표면▼a드라이아웃 진동 완화

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