Data on Internal Rarefied Gas Flows

Sharipov, Felix; Селезнев, В. Д.

doi:10.1063/1.556019

Cited by 689 publications

(560 citation statements)

References 69 publications

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“…We are preparing for further theoretical study of vacuum conductance through nanopipettes, especially for the discussion of an opposite gas flow through nanopipettes, using a dynamic equation, [32][33][34][35] which will be published elsewhere. 36) …”

Section: Discussionmentioning

confidence: 99%

Argon gas flow through glass nanopipette

Takami

Nishimoto

Goto

et al. 2016

Jpn. J. Appl. Phys.

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We have observed the flow of argon gas through a glass nanopipette in vacuum. A glass nanopipette with an inner diameter of 100 nm and a shank length of 3 mm was set between vacuum chambers, and argon gas was introduced from the top of the nanopipette to the bottom. The exit pressure was monitored with an increase in entrance pressure in the range of 50–170 kPa. Knudsen flow was observed at an entrance pressure lower than 100 kPa, and Poiseuille flow was observed at an entrance pressure higher than 120 kPa. The proposed pressure-dependent gas flow method provides a means of evaluating the glass nanopipette before using it for various applications including nanodeposition to surfaces and femtoinjection to living cells.

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Section: Discussionmentioning

confidence: 99%

Argon gas flow through glass nanopipette

Takami

Nishimoto

Goto

et al. 2016

Jpn. J. Appl. Phys.

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“…T L = 2T R = T w as mentioned earlier. This test case has been employed in the past for various studies with small temperature differences (see Springer 1971;Sharipov & Seleznev 1998;). As we do not make any linearizations, however, a large temperature difference is applied here.…”

Section: Heat Transportmentioning

confidence: 99%

Fokker–Planck model for computational studies of monatomic rarefied gas flows

2011

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In this study, we propose a non-linear continuous stochastic velocity process for simulations of monatomic gas flows. The model equation is derived from a FokkerPlanck approximation of the Boltzmann equation. By introducing a cubic non-linear drift term, the model leads to the correct Prandtl number of 2/3 for monatomic gas, which is crucial to study heat transport phenomena. Moreover, a highly accurate scheme to evolve the computational particles in velocity-and physical space is devised. An important property of this integration scheme is that it ensures energy conservation and honours the tortuosity of particle trajectories. Especially in situations with small to moderate Knudsen numbers, this allows to proceed with much larger time steps than with direct simulation Monte Carlo (DSMC), i.e. the mean collision time not necessarily has to be resolved, and thus leads to more efficient simulations. Another computational advantage is that no direct collisions have to be calculated in the proposed algorithm. For validation, different micro-channel flow test cases in the near continuum and transitional regimes were considered. Detailed comparisons with DSMC for Knudsen numbers between 0.07 and 2 reveal that the new solution algorithm based on the Fokker-Planck approximation for the collision operator can accurately predict molecular stresses and heat flux and thus also gas velocity and temperature profiles. Moreover, for the Knudsen Paradox, it is shown that good agreement with DSMC is achieved up to a Knudsen number of about 5.

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“…In the case of cylindrical channel the value of G diff for completely diffuse reflection can be calculated using (1) [15] if the transmission probability W diff for given L is known.…”

Section: Experimental Backgroundmentioning

confidence: 99%

“…Transmission probability of the cylindrical channel in the case of completely diffuse reflection W diff for arbitrary L can be calculated using (2) [15].…”

Section: Experimental Backgroundmentioning

confidence: 99%

Simulation of the influence of surface chemical composition on internal gas flow at large Knudsen numbers

Ukhov

Borisov

Porodnov

2013

International Journal of Heat and Mass Transfer

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a b s t r a c tOn the basis of the developed model, an attempt to describe a rarefied gas flow in the cylindrical channel, whose surface chemical composition conforms with the real experimental conditions, has been made. During the modeling two cases are considered: the atomically clean silver channel surface and the surface fully covered with the adsorbate, which is simulated by oxygen according to the data of the Augerspectroscopic analysis. The gas-surface interaction process is based on the molecular dynamic principle. Thermal vibrations of the surface atoms are also considered. The obtained results of calculation are compared with experimental data.Crown

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Data on Internal Rarefied Gas Flows

Cited by 689 publications

References 69 publications

Argon gas flow through glass nanopipette

Argon gas flow through glass nanopipette

Fokker–Planck model for computational studies of monatomic rarefied gas flows

Simulation of the influence of surface chemical composition on internal gas flow at large Knudsen numbers

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