低温ヘリウム流中の微量二酸化炭素の析出挙動と流動抵抗特性
Deposition behavior and flow resistance characteristics of trace carbon dioxide in a low-temperature helium flow (原題)
Ziqi Wei, Peilei Qu, Zhichao Chen, Xi Chen, Zhenhua Jiang, Baoyu Yang, Shaoshuai Liu
🤖 gxceed AI 要約
日本語
本研究は、極低温ヘリウム流中でのCO2の霜析出による流路閉塞の動的プロセスを、2次元物質移動モデルと過渡圧力損失測定を組み合わせて解明した。CO2添加率が低下すると、閉塞に必要なCO2総質量が減少し、性能劣化の臨界質量が大幅に低下することを示した。この知見は、極低温システムの安定性評価に貢献する。
English
This study investigates frost deposition from trace CO2 in cryogenic helium flow, revealing a four-stage clogging process (nucleation-growth-reconstruction-clogging) via a 2D mass transfer model and transient pressure drop measurements. Lower CO2 addition rates reduce the total mass required for clogging and sharply lower critical failure thresholds, providing insights for cryogenic system stability.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本のGX文脈では、CCUSや水素液化などの極低温技術の信頼性向上に寄与する可能性があるが、直接的な政策連動は弱い。日本企業の極低温機器設計に参考となる基礎データを提供する。
In the global GX context
Globally, this research supports the reliability of cryogenic carbon capture and LNG systems, which are relevant to decarbonization infrastructure. It offers fundamental insights into flow assurance in cryogenic processes, though it is not directly linked to disclosure or policy frameworks.
👥 読者別の含意
🔬研究者:Provides a detailed mechanism of CO2 frost clogging in cryogenic systems, useful for modeling and design.
🏢実務担当者:Offers operational limits for cryogenic equipment handling trace CO2, aiding in maintenance and safety.
📄 Abstract（原文）
The effects of frost deposition from condensable gases on flow resistance and heat transfer are critical issues in fields such as liquefied natural gas processing, cryogenic carbon capture, and cryogenic systems. This study investigates the dynamic physical processes underlying the sudden surge in macroscopic flow resistance caused by frost layer growth following the desublimation of trace carbon dioxide (CO2) in a helium flow under cryogenic conditions, and its subsequent impact on system stability. By combining a two-dimensional mass transfer model with transient pressure drop measurements, this study reveals a four-stage process (nucleation–growth–reconstruction–clogging) of flow path clogging caused by CO2 desublimation in a helium Joule–Thomson cryogenic system. Notably, macroscopic evidence indicates a flow-induced frost reconstruction stage. During this stage, as the cross-sectional hydraulic diameter constricts due to frost accumulation, the escalating wall shear stress triggers mechanical instabilities within the porous frost layer, driving its structural reconstruction. The results indicate that as the CO2 addition rate decreases, the total mass of CO2 required to cause flow path clogging also decreases to 511.43, 473.53, and 378.50 mg, respectively, while the critical mass thresholds triggering system performance failure drop sharply to 66.05, 20.42, and 16.73 mg, respectively. This finding suggests that lower CO2 mass fluxes lead to more concentrated and localized blockages within specific thermodynamic regions. This discovery provides a reference for evaluating the operational limits and stability of microscale multiphase flow in cryogenic environments.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1063/5.0346252first seen 2026-08-22 04:53:14
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