Results 251 to 260 of about 140,105 (289)

Brownian coagulation of aerosols at low Knudsen number

Faraday Symposia of the Chemical Society, 1973
Dibutyl phthalate aerosols of narrow size distribution have been prepared in a falling-film generator using nitrogen rather than helium as the carrier gas. The Knudsen number in nitrogen is considerably lower so that the Cunningham correction is much less.
Gilbert A. Nicolaon, Milton Kerker
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Lubrication Theory at Arbitrary Knudsen Number

Journal of Tribology, 1985
It is demonstrated that the slip flow Reynolds equations for ultra low clearance gas bearings can be derived from kinetic theory by an approximation scheme appropriate for arbitrary Knudsen numbers. Thus the usefulness of the slip flow Reynolds equation is extended to cases where it would not be expected to hold.
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Molecular velocity distribution at large Knudsen numbers

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 1991
It is commonly assumed that the distribution of molecular velocities follows a Maxwellian distribution also in the range of high and ultrahigh vacuum, i.e., at large Knudsen numbers. This distribution is theoretically derived from statistical analysis of an ensemble of molecules with frequent molecule–molecule collisions.
W. Jitschin, G. Reich
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Flows at Large Knudsen Numbers

1969
Free-molecule flow is defined as the flow obtained in the limit when the Knudsen number Kn → ∞. In that case, the Boltzmann equation takes the form (see also §§2.11 and 4.2) $$ \frac{{df}}{{dt}} = \frac{{\partial f}}{{\partial t}} + \xi \cdot \frac{{\partial f}}{{\partial x}} + \frac{X}{m} \cdot \frac{{\partial f}}{{\partial \xi }} = 0 $$ (1.1)
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Orifice flow at high Knudsen numbers

Journal of Fluid Mechanics, 1961
Several interesting features of the flow field in free-molecule flow through an orifice are discussed. An estimate is then made of the deviation of the mass flow $\dot{m}$ through the orifice from its limiting free-molecule value $\dot{m}$ for small departures from the limit. Using an iteration method proposed by Willis, it is shown that this deviation
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Recondensation of a monatomic gas at low Knudsen numbers

USSR Computational Mathematics and Mathematical Physics, 1978
Abstract THE PROBLME of the one-dimensional motion of a gas between infinite plane-parallel evaporating and absorbing surfaces is considered on the basis of model kinetic equation for a monatomic gas. A specially developed numerical method makes it possible to obtain a solution of the problem for the whole range of Knudsen numbers and trace the gas ...
Bisaev, A. M., Rykov, V. A.
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Solving the kinetic equation for all Knudsen numbers

Physics of Fluids, 2000
Starting from the Boltzmann kinetic equation, a system is constructed which allows one to calculate flow fields with strong deviation from equilibrium and for Knudsen numbers 0<Kn0<∞. This is achieved by interlacing the path-integral form of the kinetic equation with the equations of conservation (the first five moments of the equation of
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A comprehensive review on micro- and nano-scale gas flow effects: Slip-jump phenomena, Knudsen paradox, thermally-driven flows, and Knudsen pumps

Physics Reports, 2023
Hassan Akhlaghi, Ehsan Roohi, Stefan Stefanov   +2 more
exaly  

Sphere Drag at High Knudsen Number and Low Mach Number

The Physics of Fluids, 1966
Knudsen iteration is used to calculate sphere drag at low Mach and high Knudsen numbers, using the Bhatnager, Gross, Krook model to describe the intermolecular collisions. Comparisons are made with previous approximate calculations and with experiment.
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KNUDSEN NUMBER

2011
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