Results 271 to 280 of about 1,805 (310)

Interferometry in Rarefied Gas Flows

1993
A survey is given on optical interferometry using a Wollaston prism differential interferometer. With a number of selected examples, its potential, especially in the field of low density flow diagnostics, is demonstrated. In the first part, differential interferometry with spark light sources is treated and is shown to be a very effective means for ...
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Flow Induced by Thermal Stress in Rarefied Gas

The Physics of Fluids, 1972
A new kind of mechanism which induces a flow around a solid body in a slightly rarefied gas is proposed. In order to demonstrate the flow induced by this mechanism the behavior of gas around a sphere with a constant temperature which is placed in an infinite expanse of gas at rest with a uniform temperature gradient is investigated on the basis of the ...
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Rarefied gas flow in a cylindrical annulus

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 1983
The Hansen–Morse model of the linearized Wang Chang–Uhlenbeck equation is used to study the thermal transpiration and mechanocaloric effects for rarefied polyatomic gases in a cylindrical annulus, where boundary conditions are characterized by diffuse reflection.
S. S. Lo, S. K. Loyalka, T. S. Storvick
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Flow of a Rarefied Gas through a Cylindrical Tube

The Physics of Fluids, 1967
The problem of Poiseuille flow through a cylindrical tube previously solved numerically by Cercignani is attacked analytically. The integral equation for the velocity as a function of radius is cast into a convenient form and its solution is obtained in limiting cases. For large Knudsen number a solution is obtained by Neumann series. For small Knudsen
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Flow of Rarefied Gas past a Liquid Sphere

AIAA Journal, 1992
The author considers a perfectly spherical drop that is placed in the unbounded slow flow of rarefied gas in the near-continuum regime. In comparison with the flow past a solid sphere, the flow under consideration is solved taking into account the internal circulating motion of the liquid itself induced by the frictional forces acting at the sphere ...
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Rarefied Gas Flow Around a 3D-Deltawing

1991
This paper presents numerical results for hypersonic flows around a 3D-deltawing at a low Knudsen number. The underlying body geometry as well as the physical parameters correspond to testcase 7.2.1. of the workshop. The numerical method used for the calculations is the Finite-Pointset-Method (FPM) developed at the University of Kaiserslautern since ...
F. Gropengieβer, H. Neunzert, J. Struckmeier, B. Wiesen   +3 more
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Construction and testing of a rarefied gas flow facility

1967
A low-density gasdynamic facility, suitable for measurement of mass flow through small (approximately 1 mm diameter) nozzles, tubes, and orifices, was designed and constructed. The system is capable of producing and measuring mass flows at 100:1 upstream/downstream pressure ratios for the entire spectrum from continuum to free molecular flow.
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Simulations of rarefied gas flows

2013
The new generation of Lithography equipment of ASML uses rarefied gas flows in order to keep the mirrors from blackening. These flows cannot be modeled by conventional computational fluid dynamics based on the Navier-Stokes, NS, equation, because the continuum approach is no longer valid.
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Generalized description of the Knudsen layer thickness in rarefied gas flows

Physics of Fluids, 2021
Ehsan Roohi, Hassan Akhlaghi, Roohi Ehsan   +2 more
exaly  

Improved gas-kinetic unified algorithm for high rarefied to continuum flows by computable modeling of the Boltzmann equation

Physics of Fluids, 2021
Zhihui Li, Wu Junlin, Wen-Qiang Hu
exaly