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A generalized Knudsen theory for gas transport with specular and diffuse reflections

文献类型：期刊论文

作者Qian, JianHao2; Wu, HengAn1,2; Wang, FengChao1,2; Wang FC(王奉超)
刊名NATURE COMMUNICATIONS
出版日期2023-11-15
卷号14期号:1页码:8
DOI10.1038/s41467-023-43104-6
通讯作者Wu, HengAn(wuha@ustc.edu.cn) ; Wang, FengChao(wangfc@ustc.edu.cn)
英文摘要Gas permeation through nanopores is a long-standing research interest because of its importance in fundamental science and many technologies. The free molecular flow is conventionally described by Knudsen theory, under the diffuse reflection assumption. Recent experiments reported ballistic molecular transport of gases, which urges for the development of theoretical tools to address the predominant specular reflections on atomically smooth surfaces. Here we develop a generalized Knudsen theory, which is applicable to various boundary conditions covering from the extreme specular reflection to the complete diffuse reflection. Our model overcomes the limitation of Smoluchowski model, which predicts the gas flow rate diverging to infinity for specular reflection. It emphasizes that the specular reflection can reduce the dissipation flow rate. Our model is validated using molecular dynamics simulations in various scenarios. The proposed model provides insights into the gas transport under confinement and extends Knudsen theory to free molecular flow with specular reflections. Knudsen theory and Smoluchowski model perform poorly for ballistic gas transport. Qian et al. propose a generalized Knudsen theory to describe gas nanoflow, reconciling both extreme specular reflection and complete diffuse reflection.
WOS关键词FLOW TRANSMISSION PROBABILITIES ; RAREFIED-GAS ; TANGENTIAL MOMENTUM ; END CORRECTIONS ; CAPILLARIES ; TUBES
资助项目National Natural Science Foundation of China[12241203] ; National Natural Science Foundation of China[U22B2075] ; Youth Innovation Promotion Association CAS[2020449] ; Supercomputing Center of University of Science and Technology of China
WOS研究方向Science & Technology - Other Topics
语种英语
WOS记录号WOS:001126873300002
资助机构National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS ; Supercomputing Center of University of Science and Technology of China
源URL[http://dspace.imech.ac.cn/handle/311007/93767]  
专题力学研究所_非线性力学国家重点实验室
通讯作者Wu, HengAn; Wang, FengChao
作者单位1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuan West Rd, Beijing 100190, Peoples R China
2.Univ Sci & Technol China, Dept Modern Mech, CAS Key Lab Mech Behav & Design Mat, Hefei 230027, Peoples R China
推荐引用方式
GB/T 7714		 Qian, JianHao,Wu, HengAn,Wang, FengChao,et al. A generalized Knudsen theory for gas transport with specular and diffuse reflections[J]. NATURE COMMUNICATIONS,2023,14(1):8.
APA Qian, JianHao,Wu, HengAn,Wang, FengChao,&王奉超.(2023).A generalized Knudsen theory for gas transport with specular and diffuse reflections.NATURE COMMUNICATIONS,14(1),8.
MLA Qian, JianHao,et al."A generalized Knudsen theory for gas transport with specular and diffuse reflections".NATURE COMMUNICATIONS 14.1(2023):8.

入库方式： OAI收割

来源：力学研究所

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