A modified dubinin-radushkevich model describing the cryogenic adsorption of 4He on carbon materials

IF 1.8 3区工程技术 Q3 PHYSICS, APPLIED

Cryogenics Pub Date : 2024-10-30 DOI:10.1016/j.cryogenics.2024.103977

Teng Pan , Fangqiu Yu , Ke Li , Zhenxing Zhu , Fei Wei , Wei Dai , Jun Shen

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引用次数: 0

Abstract

The ⁴He and ³He adsorption characteristics of porous materials serve as important references for designing and optimizing cryogenic components or systems, including adsorption pumps, helium adsorption refrigerators, and gas-gap heat switches. In this study, various types of activated carbon and carbon nanotubes were measured for their ⁴He adsorption characteristics in the range of 3–20 K and 1–18000 Pa. Parameters such as micropore volume and adsorption potential energy of porous materials were analyzed through Dubinin-Radushkevich (DR) model. A modified DR model describing the monolayer adsorption of ⁴He on different carbon-based adsorbents was developed in this study, greatly facilitating the design of adsorption systems. Further, the ⁴He adsorption model was applied to gas-gap heat switches, and a numerical model of the ⁴He gas-gap heat switch was established, which accurately predicts the actuation characteristics of several heat switches.

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描述碳材料低温吸附 4He 的杜宾-拉杜什凯维奇修正模型

多孔材料的 4He 和 3He 吸附特性是设计和优化低温元件或系统（包括吸附泵、氦吸附制冷器和气隙热交换器）的重要参考。本研究测量了各种类型的活性炭和碳纳米管在 3-20 K 和 1-18000 Pa 范围内的 4He 吸附特性。通过杜宾-拉杜什基维奇（Dubinin-Radushkevich，DR）模型分析了多孔材料的微孔体积和吸附势能等参数。该研究建立了一个描述 4He 在不同碳基吸附剂上单层吸附的改进 DR 模型，大大方便了吸附系统的设计。此外，还将 4He 吸附模型应用于气隙热开关，并建立了 4He 气隙热开关的数值模型，准确预测了多个热开关的致动特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cryogenics 物理-热力学

CiteScore

3.80

自引率

9.50%

发文量

审稿时长

2.1 months

期刊介绍： Cryogenics is the world''s leading journal focusing on all aspects of cryoengineering and cryogenics. Papers published in Cryogenics cover a wide variety of subjects in low temperature engineering and research. Among the areas covered are: - Applications of superconductivity: magnets, electronics, devices - Superconductors and their properties - Properties of materials: metals, alloys, composites, polymers, insulations - New applications of cryogenic technology to processes, devices, machinery - Refrigeration and liquefaction technology - Thermodynamics - Fluid properties and fluid mechanics - Heat transfer - Thermometry and measurement science - Cryogenics in medicine - Cryoelectronics