Topic
Knudsen number
About: Knudsen number is a research topic. Over the lifetime, 5052 publications have been published within this topic receiving 104278 citations.
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TL;DR: In this article, the problem of non-isothermal quasi-steady state evaporation and condensation of aerosol spheres is examined to determine the rates of simultaneous heat and mass transport in the Knudsen (transition) regime.
29 citations
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TL;DR: An adaptive particle–cell scheme applicable to a general unstructured mesh is derived for the Fokker–Planck kinetic model and excellent agreement between the introduced adaptive FP method and DSMC is achieved.
29 citations
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TL;DR: In this article, surface measurements and flowfield properties about slender cones in hypersonic viscous interaction regime were obtained for a single cone in the presence of a viscous interface.
Abstract: Hypersonic surface measurements and flowfield properties about slender cones in hypersonic viscous interaction regime
29 citations
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TL;DR: In this paper, the authors applied the molecular dynamics simulation method to investigate the rarefied gas flow in a submicron channel with surface roughness which was modelled by an array of triangle modules.
Abstract: The molecular dynamics simulation method is applied to investigate the rarefied gas flow in a submicron channel with surface roughness which is modelled by an array of triangle modules. The boundary conditions are found to be determined not only by the Knudsen number but also the roughness, which implies that the breakdown of the Maxwell slip model under the conditions that the surface roughness is comparable to the molecular mean free path. The effects of the rarefaction and the surface roughness on the boundary conditions and the flow characteristics are strongly coupled. The flow friction increases with increasing roughness and with decreasing Knudsen number.
29 citations
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TL;DR: The smart wall molecular dynamics (SWMD) as mentioned in this paper represents three-dimensional FCC walls using only 74 wall molecules, which is kept in the memory and utilized for each gas molecule surface collision.
Abstract: Three-dimensional molecular dynamics (MD) simulations of gas flows con- fined within nano-scale channels areinvestigated by introductionof asmart wall model that drastically reduces the memory requirements of MD simulations for gas flows. The smart wall molecular dynamics (SWMD) represents three-dimensional FCC walls using only 74 wall molecules. This structure is kept in the memory and utilized for each gas molecule surface collision. Linear Couette flow of argon at Knudsen number 10 is investigated using the SWMD utilizing Lennard-Jones potential interactions. Ef- fects of the domain size on the periodicity boundary conditions are investigated using three-dimensional simulations. Domain sizes that are one mean-free-path long in the periodic dimensions are sufficient to obtain domain-size independent MD solutions of nano-scale confined gas flows. Comparisons between the two- and three-dimensional simulations show the inadequacy of two-dimensional MD results. Three-dimensional SWMD simulations have shown significant deviations of the velocity profile and gas density from the kinetic theory based predictions within the force penetration region of the walls.
29 citations