旋转对气体吸附影响的热力学分析

IF 4.3 3区工程技术 Q1 MECHANICS

Journal of Non-Equilibrium Thermodynamics Pub Date : 2023-04-12 DOI:10.1515/jnet-2022-0086

R. Kosheleva, T. Karapantsios, M. Kostoglou, A. Mitropoulos

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引用次数: 0

摘要

摘要:本研究考察了短期旋转对恒体积系统的影响。二氧化碳吸附在活性炭(AC)上进行281,293和298 K与一个特殊设计的装置，允许旋转。无旋转(NoROT)和旋转(ROT)两种情况下的吸附等温线均达到10 bar。ROT情况是指在5000 rpm下旋转60 秒。实验结果拟合Langmuir模型和Dubinin-Astakhov (D-A)模型，后者拟合最佳。进行了详细的热力学分析，以便与静态情况相比，量化旋转对气体吸附的总体贡献。对于ROT情况，最大吸附量(q max)比NoROT情况高12%，而化学势随着表面负载的增加而降低，表明旋转后的过程是熵驱动的。这项工作的结果表明，旋转使气体分子能够进入以前无法进入的位置，从而由于吸附的二氧化碳分子的更好重排而获得更多的空位。

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Thermodynamic analysis of the effect of rotation on gas adsorption

Abstract This study examines the effect of a short term rotation on a system of constant volume. Adsorption of CO2 is performed on Activated Carbon (AC) at 281, 293 and 298 K with a special designed device that allows rotation. The adsorption isotherms were conducted up to 10 bar for both No Rotational (NoROT) and Rotational (ROT) cases. The ROT case refers to 60 s of rotation at 5000 rpm. The experimental results were fitted to Langmuir as well as to Dubinin–Astakhov (D–A) models with the latter presenting the best fit. A detailed thermodynamic analysis is performed in order to quantify the overall contribution of the rotation on gas adsorption compared to static case. For the ROT case, the maximum amount adsorbed (q max) is by 12 % higher than the NoROT counterpart, while a decrease in chemical potential as surface loading is increased, indicates that the process after rotation is entropy driven. The outcome of this work suggests that rotation enables gas molecules to access previously inaccessible sites, thus gaining more vacancies due to better rearrangement of the adsorbed CO2 molecules.

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来源期刊

Journal of Non-Equilibrium Thermodynamics 物理-力学

CiteScore

9.10

自引率

18.20%

发文量

审稿时长

1 months

期刊介绍： The Journal of Non-Equilibrium Thermodynamics serves as an international publication organ for new ideas, insights and results on non-equilibrium phenomena in science, engineering and related natural systems. The central aim of the journal is to provide a bridge between science and engineering and to promote scientific exchange on a) newly observed non-equilibrium phenomena, b) analytic or numeric modeling for their interpretation, c) vanguard methods to describe non-equilibrium phenomena. Contributions should – among others – present novel approaches to analyzing, modeling and optimizing processes of engineering relevance such as transport processes of mass, momentum and energy, separation of fluid phases, reproduction of living cells, or energy conversion. The journal is particularly interested in contributions which add to the basic understanding of non-equilibrium phenomena in science and engineering, with systems of interest ranging from the macro- to the nano-level. The Journal of Non-Equilibrium Thermodynamics　has recently expanded its scope to place new emphasis on theoretical and experimental investigations of non-equilibrium phenomena in thermophysical, chemical, biochemical and abstract model systems of engineering relevance. We are therefore pleased to invite submissions which present newly observed non-equilibrium phenomena, analytic or fuzzy models for their interpretation, or new methods for their description.