Results 1 to 10 of about 3,925 (158)
Method for obtaining the Knudsen diffusion coefficient [PDF]
MethodsX, 2018 Recently, we developed a method for obtaining the Knudsen diffusion coefficient from the results of tracer experiments with a binary gas system and a porous medium in a column.
Yoshihiko Hibi
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Diffusion models for Knudsen compressors [PDF]
Physics of Fluids, 2007 A rarefied gas in a long straight pipe with a periodic structure consisting of alternately arranged narrow and wide pipes and with periodic temperature distribution, which is known as the Knudsen compressor (or pump), is considered. Under the assumption that the pipe is much thinner than the period, a diffusion model that describes the pressure ...
Shigeru Takata +2 more
exaly +3 more sources
The effect of Knudsen diffusion and adsorption on shale transport in nanopores
Advances in Mechanical Engineering, 2017 Shale transport properties are investigated by numerical simulations of a simple, physics-based continuum model. Shale samples from the Yanchang Triassic Formation in Ordos Basin are tested to get the pore volume distribution of shale.
Jie Chen +3 more
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Direction-specific enhanced diffusion of CO2 in chiral hexagonal boron nitride nanotubes [PDF]
Nature CommunicationsTo meet performance requirements, the next generation of gas separation membranes will need both high gas permeability and selectivity, attainable if we could coax adsorbates to minimize random Brownian motion and produce direction-specific diffusion ...
Manh-Thuong Nguyen +4 more
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Determination of the type of nanoconfined gas transport and quantification of their velocity contributions from molecular perspectives [PDF]
Scientific ReportsUnderstanding the gas flow in nanoconfined spaces is crucial for industrial applications. In this work, we analyzed the type of gas transport in nanopores and quantified their velocity contributions to the total gas flux by performing molecular dynamics ...
Xinyi Zhao, Qian Sang, Jun Yao
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Knudsen Diffusivity in Random Billiards: Spectrum, Geometry, and Computation [PDF]
SIAM Journal on Applied Dynamical Systems, 2021 29 pages, 12 ...
Timothy Chumley +2 more
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Apparent permeability in tight gas reservoirs combining rarefied gas flow in a microtube
Frontiers in Earth Science, 2023 In tight gas reservoirs, the major flow channels are composed of micro/nanopores in which the rarefaction effect is prominent and the traditional Darcy law is not appropriate for gas flow.
Lingli Zheng +5 more
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Knudsen Diffusion in Silicon Nanochannels [PDF]
Physical Review Letters, 2008 Measurements on helium and argon gas flow through an array of parallel, linear channels of 12 nm diameter and 200 micrometer length in a single crystalline silicon membrane reveal a Knudsen diffusion type transport from 10^2 to 10^7 in Knudsen number Kn.
Gruener, Simon, Huber, Patrick
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Nano Select, 2021 The pore size distribution of the catalyst layer (CL) significantly influences the effective diffusion coefficient (EDC) of the reactant gas due to the Knudsen diffusion effect in the proton exchange membrane fuel cell (PEMFC).
Yan Yin +4 more
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Evaluation of the application of different diffusion models for the methanation of CO/CO2 mixtures
Results in Engineering, 2022 CO/CO2-Methanation can contribute to the storage of intermittently produced renewable energy. In order to be able to design this heterogenous catalytic process well with models, a solid diffusion model is necessary.
Jannik Schumacher +3 more
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